JP2002261731A - Ultrasonic radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To build up a radio communication network superior in confidentiality. SOLUTION: An individual transmitter excites a second piezoelectric board 14 to generate a uniquely coded elastic surface wave, when a train of pulses is applied to a uniquely coded grid electrode 15 from an input terminal 1 via switches 2, 3. A grid electrode C0 detects the uniquely coded elastic surface wave as a uniquely coded burst signal, corresponding to a uniquely coding pattern and a grid electrode C1 re-detects it with a time delay corresponding to a distance L as a uniquely coded burst signal. A combined output signal of both uniquely coded burst signals detected by the grid electrodes C0 , C1 is sent to a first amplifier 7 via a switch 6 and then is transmitted from an antenna 9 via a switch 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an ultrasonic radio communication system comprising a radio communication device and a personal card inserted therein.

[0002]

2. Description of the Related Art As the number of business transactions using a wireless communication network increases, the number of cases in which trouble is encountered is increasing. From the viewpoint of information security, coding technology has been advanced mainly in software. As hardware, the encoding function of magnetic cards and IC cards has been improved, but there are many issues to be solved in order to ensure sufficient security. Magnetic cards are the most versatile,
There are problems such as relatively easy copying and easy stealing of the password. Therefore, illegal use of credit cards, cash cards, prepaid cards, and the like continues. Although IC cards are superior to magnetic cards in that they are less likely to be forged, they are not sufficient in terms of information security.
In addition, there is a problem that the manufacturing process is complicated as compared with the magnetic card.

[0003]

SUMMARY OF THE INVENTION The present invention relates to an authentication method which makes it difficult not only to make unauthorized copies but also to steal passwords for cards such as credit cards, cash cards and prepaid cards, and keys for cars and houses. The purpose is to have functions. It is a further object of the present invention to provide an ultrasonic wireless communication system that has a simple device configuration, is small and lightweight, has excellent durability, can be mass-produced, and can be driven with low power consumption.

[0004]

An ultrasonic wireless communication system according to claim 1 is an ultrasonic wireless communication system including a wireless communication device and a personal card, wherein the wireless communication device includes a first piezoelectric substrate, Encoding IDTs,
First electrode group, first amplifier, antenna, second amplifier, second
The personal card comprises an electrode group, a first interdigital transducer and a signal analyzer, and the personal card comprises a second piezoelectric substrate, a unique encoding interdigital transducer, a third electrode group, and a second interdigital transducer. The coded interdigital transducer is an electrode pair P _i (i = 1,
2, ..., consist n), adjacent groups out of the electrode pairs P _i 2
One has a separation distance L, the coded interdigital transducer has a predetermined code pattern, and the first electrode group has an interdigital transducer.
And A _0, the consist distance from interdigital electrode A ₀ iL (i = 1) apart interdigital electrodes A _{i (i} = 1), the second electrode group and the central interdigital electrode B _0, the central distance L ₀ from interdigital electrode B ₀
Right interdigital electrode B- ₁ and the left interdigital electrode B _i separated from the central interdigital electrode B ₀ by a distance L ₀ + iL (i = 1).
(i = 1), the unique coded IDT includes the electrode pair P _i corresponding to the coded IDT, and the unique coded IDT has a unique code pattern. The third electrode group includes an interdigital electrode C ₀ and an interdigital electrode C _i separated from the interdigital electrode C ₀ by a distance iL (i = 1).
(i = 1), the second piezoelectric substrate, the unique encoding IDT, the third electrode group, the first amplifier and the antenna constitute an individual transmission unit, the first piezoelectric substrate, A main transmitting section is constituted by the coded interdigital transducer, the first electrode group, the first amplifier, and the antenna, and the antenna, the second amplifier, the first piezoelectric substrate, the second electrode group, and the second A piezoelectric substrate, the second relay interdigital transducer, the unique encoding interdigital transducer and the signal analyzer constitute an individual receiver, and the antenna, the second amplifier, the first piezoelectric substrate, and the second
A main receiving unit is constituted by an electrode group, the first relay IDT, the coded IDT, and the signal analyzer. In the individual transmission unit, a pulse is applied to the unique coded IDT. by the the second piezoelectric substrate is specific coded SAW is excited, the unique coded surface acoustic wave, the detected at interdigital electrode C ₀ as unique coded burst signal corresponding to the specific code pattern and then, the distance iL again after a delay to time corresponding to the detected at interdigital electrodes C _i, the unique in the unique coded burst signal and the interdigital electrodes C _i in the interdigital electrode C ₀ A combined output signal of the coded burst signal is transmitted from the antenna via the first amplifier, and the main transmission unit applies a transmission message digital signal to the coded IDT. By being, coded surface acoustic waves are excited in the first piezoelectric substrate, the coded surface acoustic wave, after the detected at interdigital electrode A ₀ as coded burst signal corresponding to the code pattern, said distance iL detected in again after a delay time corresponding the interdigital electrode a _i, the said coded burst signal and said coded burst signal at interdigital electrode a _i in the interdigital electrode a ₀ The combined output signal is transmitted from the antenna via the first amplifier, and in the individual receiving unit, when the unique double coded burst signal is received by the antenna,
The unique double coded burst signal is passed through the second amplifier to the right interdigital electrode B _-1 and the left interdigital electrode B _i.
Each is applied to the the first piezoelectric substrate first and second surface acoustic waves are excited, respectively, the first and second surface acoustic wave in said central interdigital transducer B ₀ unique single coded burst signal The unique single-coded surface acoustic wave is excited by the converted single-coded burst signal being applied to the second relay interdigital transducer, whereby the unique single-coded surface acoustic wave is excited. The propagation direction of the wave is opposite to the propagation direction of the unique coded surface acoustic wave in the individual transmission unit, and if the unique single encoded surface acoustic wave is correlated with the unique code pattern, the unique decoding A pulse is detected at the unique encoding IDT, the unique decoding pulse is input to the signal analyzer, and at the main receiver, the received message double encoded burst signal is transmitted to the amplifier. Once received by the burner, the received message double coded burst signal and the right interdigital electrode B _-1 through the second amplifier, respectively, is applied to the left interdigital electrodes B _i, the first third and fourth surface acoustic waves are excited respectively in the piezoelectric substrate, said third and fourth surface acoustic wave is converted into single coded burst signal at said central interdigital transducer B _0, the single coded burst signal A single coded surface acoustic wave is excited on the first piezoelectric substrate by being applied to the first interdigital transducer, and the direction of propagation of the single coded surface acoustic wave is determined by the coding in the main transmitting unit. The direction of propagation of the surface acoustic wave is opposite, and if the single coded surface acoustic wave is correlated with the code pattern, a decoded pulse is detected at the coded IDT and the decoded pulse is detected. Is input to the signal analyzer.

[0005] In an ultrasonic wireless communication system according to claim 2, the coded IDT comprises at least three electrode pairs.

According to a third aspect of the present invention, there is provided an ultrasonic wireless communication system, wherein the unique coded IDT comprises a multiple of four parts, at least one of which is the same as the coded IDT. And the rest all form an electrodeless finger structure, said electrodeless finger structure having a size similar to the appearance of said coded IDT.

An ultrasonic radio communication system according to claim 4.
Is an ultrasound system consisting of a wireless communication device and a personal card
A wireless communication system, wherein the wireless communication device comprises:
First piezoelectric substrate, bipolar pulse generator, first and second marks
Interdigital transducer, first electrode group, first amplifier, antenna
, Second amplifier, second electrode group, first interdigital transducer
And the signal analyzer, wherein the personal card has a second pressure
Circuit board, unique encoding IDT, third electrode group and
2. The first and second marks are composed of two interdigital transducer electrodes.
Each of the digitized interdigital transducers has an electrode pair P_i (i = 1, 2,…,
n), said electrode pair P_iTwo of them are separated
The first and second coded interdigital transducers having a distance L
Have first and second code patterns, respectively,
The first electrode group is an interdigital electrode A₀And the interdigital transducer A₀Or
Electrode A separated by a distance iL (i = 1)_i (i = 1)
And the second electrode group is a center interdigital electrode B₀And the center
IDT B₀Distance L from₀Right interdigitated electrode B
_-1And the central interdigital electrode B ₀Distance L from₀+ iL (i = 1)
Separated left interdigital electrode B_i (i = 1)
The coding IDT corresponds to the coding IDT.
The electrode pair P_iAnd the unique encoding IDT
The electrode has a unique code pattern, and the third electrode group is
Reed electrode C₀And the interdigital electrode C₀From iL (i = 1)
Separated interdigital transducer C_i (i = 1), the second piezoelectric
A substrate, the unique encoding IDT, the third electrode group,
An individual transmitting unit by the first amplifier and the antenna
And the first piezoelectric substrate and the bipolar pulse generation
Device, the first and second coded interdigital transducers, the first
Mainly by an electrode group, the first amplifier and the antenna.
A transmitting unit is configured, wherein the antenna, the second amplifier,
The first piezoelectric substrate, the second electrode group, the second piezoelectric substrate,
The second interdigital transducer, the uniquely coded interdigital transducer
An individual receiver is constituted by the electrodes and the signal analyzer.
And the antenna, the second amplifier, and the first piezoelectric substrate.
Plate, the second electrode group, the first interdigital transducer, front
The first and second coded interdigital transducers and the signal component
The main receiving unit is constituted by the analyzer, and the individual transmitting unit
A pulse is applied to said unique encoding IDT
In this way, the unique coded surface acoustic wave is applied to the second piezoelectric substrate.
Is excited, and the unique coded surface acoustic wave is
As a unique coded burst signal corresponding to the
ID electrode C₀After detecting at the distance iL
After a delay time of_iDetected by
The interdigital transducer C₀Said unique encoded burst signal at
No. and the interdigital transducer C_iThe specific encoding verse in
The combined output signal of the
Transmitted from an antenna, and the main transmitting unit, the bipolar
The transmit message digital signal is applied to the pulse generator.
This produces a train of bipolar pulses (-1 and 1).
And the bipolar pulses (-1 and 1) are
And applied to the second coded IDT respectively
With this, the first and second encoded elastic members are provided on the first piezoelectric substrate.
Surface waves are respectively excited and said first and second encoding
The surface acoustic wave is applied to the first and second code patterns.
As the corresponding first and second encoded burst signals, respectively.
The interdigital transducer A₀Corresponding to the distance iL after detection at
After a delay of time_iDetected by
The interdigital transducer A₀And A_iAt each of the said
A combined output signal of one encoded burst signal and the interdigital
Electrode A₀And A_iEach said second encoded burst at
The combined output signal of the signals is passed through the first amplifier to the
The antenna is transmitted from the antenna, and the
A unique double coded burst signal is received by the
And the unique double coded burst signal is transmitted to the second amplifier.
Through the right interdigital electrode B_-1And the left IDT
Pole B_iAre applied to the first piezoelectric substrate, respectively.
And the second surface acoustic waves are excited, respectively, and the first and second surface acoustic waves are excited.
And the second surface acoustic wave is applied to the central interdigital electrode B₀Unique in
Is converted into a coded burst signal, and the unique single coded
A boost signal is applied to the second interdigital transducer.
By this, the unique single coded elasticity table is provided on the second piezoelectric substrate.
A surface wave is excited, and the propagation of the unique single coded surface acoustic wave
Direction is the unique coded elastic surface in the individual transmitter
The direction of propagation of the wave is opposite, if the unique single encoding
When the surface acoustic wave is correlated with the unique code pattern
Is the unique decoding pulse at the unique encoding IDT.
Detected and the unique decoding pulse enters the signal analyzer.
In the main receiver, the received message is double encoded.
When a burst signal is received by the antenna,
The received message double coded burst signal is the second
The right interdigital electrode B through the width gauge_-1And the left blind
Electrode B _iTo the first piezoelectric substrate.
Third and fourth surface acoustic waves are excited, respectively,
The message double coded burst signal comprises a first and a second
The first double coded burst signal comprising a double coded burst signal.
The third and fourth surface acoustic waves based on the last signal are:
The center interdigital electrode B₀Is the first single coded burst signal
And is based on the second double coded burst signal.
The third and fourth surface acoustic waves are applied to the central IDT.
Pole B₀Is converted into a second single coded burst signal,
A first and a second single coded burst signal for the first relay;
When applied to the IDT, the first piezoelectric substrate
And the second single coded surface acoustic wave is excited,
And the propagation direction of the second single coded surface acoustic wave is
Transmission of the first and second coded surface acoustic waves in the transmission section
The carrying directions are opposite to each other, and if the first and second
The double coded surface acoustic wave is used for the first and second code patterns.
And the first and second decodings, respectively.
Pulse is applied to the first and second coded interdigital transducers.
Respectively, and the sum of the first and second decoding pulses is detected.
The resulting output signal is input to the signal analyzer.

According to a fifth aspect of the present invention, the first and second coded IDTs each comprise at least three electrode pairs.

An ultrasonic wireless communication system according to claim 6, wherein said unique coded IDT comprises a multiple of four parts, each of said parts being said first or second coded IDT. It has the same structure as

An ultrasonic wireless communication system according to claim 7.
Means that the first electrode group comprises at least two interdigital electrodes A_i
 {i = 1, 2, ..., (n-1)}, wherein the at least two
Dripping electrode A_iIs the interdigital transducer A₀From each other iL
 {i = 1, 2, ..., (n-1)}, and the second electrode group
Is at least two left interdigital electrodes B_i {i = 1, 2,…, (n-
1)}, said at least two left interdigital electrodes B_iIs
The center interdigital electrode B ₀Distance L from₀+ iL {i = 1,
2, ..., (n-1)}, and the third electrode group is small.
And two interdigital electrodes C_i {i = 1, 2,…, (n-1)}
The at least two interdigital transducers C_iIs the blind
Electrode C₀From each other by a distance iL {i = 1, 2,…, (n-1)}
Have been.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An ultrasonic wireless communication system according to the present invention has a simple structure consisting of a wireless communication device and a personal card inserted therein. Wireless communication devices are:
First piezoelectric substrate, coded IDT, first electrode group, first
The personal card comprises an amplifier, an antenna, a second amplifier, a second electrode group, a first relay interdigital electrode, and a signal analyzer. It consists of interdigital transducers. The coded IDT consists of an electrode pair P _i (i = 1, 2,..., N), and two adjacent electrode pairs P _i have a separation distance L. The coded IDT has a predetermined code pattern. The first electrode group and the interdigital electrodes A _0, the distance iL from interdigital electrode A ₀
It consists of interdigital electrodes A _i (i = 1) separated by (i = 1). Second
The electrode group and the central interdigital electrode B _0, the right interdigital electrode B _-1 away from the central interdigital electrode B ₀ by a distance L _0, the distance from the central interdigital electrode _{B 0 L 0 + iL (i} = 1) It consists of left interdigital electrodes B _i (i = 1) spaced apart. Specific coding IDT includes electrode pairs P _i corresponding to the coding IDT. The unique coded IDT has a unique code pattern. Third
The electrode group and the interdigital electrode C _0, the distance iL from interdigital electrode C ₀
It consists of interdigital electrodes C _i (i = 1) separated by (i = 1).

The ultrasonic radio communication system according to the present invention comprises four parts, namely, an individual transmission unit, a main transmission unit, an individual reception unit, and a main reception unit. The individual transmitter is the second
Piezoelectric substrate, unique coding IDT, third electrode group, first
The main transmitting section is constituted by the first piezoelectric substrate, the coded IDT, the first electrode group, the first amplifier and the antenna, and the individual receiving section is constituted by the antenna, the second amplifier and the first piezoelectric substrate. , The second electrode group, the second
It is composed of a piezoelectric substrate, a second interdigital transducer, a unique encoding interdigital transducer, and a signal analyzer. It consists of a shape electrode, a coded IDT and a signal analyzer.

In the individual transmitting section, when a pulse is applied to the unique coded IDT, a unique coded surface acoustic wave is excited on the second piezoelectric substrate. Specific coding SAW, after being detected at interdigital electrode C ₀ as unique coded burst signal corresponding to the specific code pattern is detected again at interdigital electrode C _i is delayed by a time corresponding to the distance iL You. Composite output signal of the unique coded burst signal at the natural coded burst signal and interdigital electrodes C _i at interdigital electrode C ₀ is transmitted from the antenna via the first amplifier.

In the main transmitting section, when a transmission message digital signal is applied to the coded IDT, a coded surface acoustic wave is excited on the first piezoelectric substrate. After the encoded surface acoustic wave is detected at the interdigital electrode A ₀ as an encoded burst signal corresponding to the encoded interdigital electrode code pattern,
Delayed by the time corresponding to the distance iL and again interdigital electrodes A _i
Is detected by Composite output signal of the coded burst signal in the coded burst signal and interdigital electrodes A _i in the interdigital electrode A ₀ is transmitted from the antenna via the first amplifier.

In the individual receiving section, when the unique double coded burst signal is received by the antenna, the unique double coded burst signal is passed through the second amplifier to the right interdigital electrode B _-1.
When, are respectively applied to the left interdigital electrodes B _i, the first and second surface acoustic wave is excited to the first piezoelectric substrate. The first and second surface acoustic wave is converted into a unique single coded burst signal at the central interdigital electrode B _0. When the unique single coded burst signal is applied to the second interdigital transducer, a unique single coded surface acoustic wave is excited on the second piezoelectric substrate. The propagation direction of the unique single coded surface acoustic wave is opposite to the propagation direction of the unique coded surface acoustic wave in the individual transmission unit. If the unique single coded SAW correlates with the unique code pattern, a unique decoded pulse is detected at the unique coded IDT. In this way, the unique coded IDT acts as a paging switch, and the unique decoded pulse is input to the signal analyzer without being affected by noise or intruders.

In the main receiving section, when the received message double-coded burst signal is received by the antenna, the received message double-coded burst signal is passed through the second amplifier to the right interdigital electrode B- ₁ and the left interdigital electrode. each is applied to Jo electrode B _i, the third and fourth surface acoustic wave is excited to the first piezoelectric substrate. Third and fourth surface acoustic wave is converted into single coded burst signal at the central interdigital electrode B _0. When the single coded burst signal is applied to the first interdigital transducer, a single coded surface acoustic wave is excited on the first piezoelectric substrate. The propagation direction of the single coded surface acoustic wave is opposite to the propagation direction of the coded surface acoustic wave in the main transmission unit. If the single encoded SAW correlates with the code pattern of the coded IDT, a decoded pulse is detected at the coded IDT. The decoded pulse is input to the signal analyzer without being affected by noise or an intruder. Therefore, in the ultrasonic wireless communication system, it is possible to construct a wireless communication network with excellent secrecy.

In the ultrasonic wireless communication system according to the present invention, a structure in which the coded IDT electrodes are composed of at least three electrode pairs is possible. In addition, the unique coded IDT is composed of multiple multiples of 4, at least one of the portions has the same structure as the coded IDT, and the rest are all electrodeless finger structures. It is possible. In this case, the electrodeless finger structure has a size similar to the appearance of the coded IDT.

In the ultrasonic radio communication system according to the present invention, a structure in which a bipolar pulse generator is newly used and first and second coded IDTs are used instead of coded IDTs is possible. It is. However, the bipolar pulse generator belongs to the main transmitter. Also, in such an ultrasonic wireless communication system, the first and second coded IDTs each comprise at least three electrode pairs, and the unique coded IDTs comprise multiples of four parts, and Each of the portions has a structure similar to the first or second coded IDT. According to such a structure, it is possible to construct a wireless communication network that is more excellent in secrecy.

In the ultrasonic radio communication system according to the present invention,
At least two interdigital electrodes A with one electrode group_i {i = 1, 2,
, (N-1)}, and the second electrode group has at least two grids.
Dripping electrode B_i Third electrode group including {i = 1, 2, ..., (n-1)}
Has at least two interdigital electrodes C_i {i = 1, 2,…, (n-
1)} is possible. In this case, the interdigital electrode A
_iID electrode A₀From the distance iL (i = 1, 2, ..., (n
-1)} apart. In addition, the left interdigital electrode B_iIs the center
Dripping electrode B₀Distance L from₀+ iL {i = 1, 2,…, (n-
1)} apart. Further, the interdigital electrode C_iBamboo blind
Electrode C₀From the distance iL {i = 1, 2,…, (n-1)}
is seperated. By adopting such a structure,
Can further enhance the confidentiality of line communication networks
Becomes

[0020]

FIG. 1 is a block diagram showing a first embodiment of an ultrasonic radio communication system according to the present invention. The ultrasonic wireless communication system of the present invention comprises a wireless communication device and a personal card inserted therein. Wireless communications device, the input terminal 1, switch 2 and 3, the first piezoelectric substrate 4, the coding IDT 5, the first consisting of interdigital electrodes A ₀ and A ₁
Electrode group, the switch 6, first amplifier 7, a switch 8, an antenna 9, a second amplifier 10, the central interdigital electrode B ₀ and the right interdigital electrode B _-1 and the left second electrode group composed of interdigital electrodes B _1,
It comprises a switch 11, a first interdigital transducer 12 and a signal analyzer 13. The personal card is the second piezoelectric substrate 1
4, it consists of unique coded IDT 15, IDT C ₀ and C ₁ third electrode group and the second relay IDT 16 made of. The interdigital electrodes A ₀ and A ₁ have a separation L, and the interdigital electrodes C ₀ and C ₁ also have a separation L. IDTs A ₀ , A ₁ , C ₀ , C ₁ , first relay IDT 12 and second relay IDT 16
Are made of aluminum thin films, each having an electrode period length of 40 μm. Right interdigital electrode B _-1 is center interdigital electrode B
It is separated from ₀ by a distance L ₀ , and the left interdigital electrode B ₁ is separated from the center interdigital electrode B ₀ by a distance L ₀ + L. Center interdigital electrode B ₀ , right interdigital electrode B- ₁ and left interdigital electrode B
₁ is made of an aluminum thin film and has an electrode cycle length of 40 μm each. Coding IDT 5, interdigital electrodes A ₀ and A _1, the central interdigital electrode B _0, the right interdigital electrode B
_-1 , left interdigital transducer B ₁ and first interdigital transducer 1
2 is provided on the first piezoelectric substrate 4. The unique encoding IDT 15, IDTs C ₀ and C _1, and the second relay IDT 16 are provided on the second piezoelectric substrate 14. Although a piezoelectric ceramic plate having a thickness of 200 μm is used as the first piezoelectric substrate 4 and the second piezoelectric substrate 14, a LiNbO ₃ single crystal plate or the like can be used.

FIG. 2 is a plan view of the coded IDT 5. The coded IDT 5 has seven electrode pairs P _i (i = 1, 2,
... consists 7), two adjacent groups out of the electrode pairs P _i has a distance L, each of the electrode pairs P _i has an interdigital periodicity of 40 [mu] m. The coded IDT 5 has a certain code pattern based on the Barker code. A 7 digit code (1,1,1,0,0,1,1) as shown in FIG.
0), for example, a 3-digit code (1,1,0)
Or 11 digit code (1,1,1,0,0,0,1,
0,0,1,0) can be used.

FIG. 3 is a plan view of the unique encoding IDT 15. The unique coded IDT 15 includes three portions having the same structure as the coded IDT 5 and one portion having an electrodeless finger structure. The electrodeless finger structure has a size similar to the appearance of the coded IDT 5. In this way, the unique coded IDT 15 has a specific code pattern including 21 electrode pairs P _i.

The ultrasonic radio communication system shown in FIG. 1 is composed of four parts, namely, an individual transmitting unit, a main transmitting unit, an individual receiving unit, and a main receiving unit. The individual transmitting unit includes an input terminal 1, switches 2 and 3, a second piezoelectric substrate 14, a unique encoding IDT 15, a third electrode group, a switch 6, a first amplifier 7, a switch 8, and an antenna 9, The main transmitting section includes an input terminal 1, switches 2 and 3,
A first piezoelectric substrate 4, a coded IDT 5, a first electrode group,
The switch includes a switch 6, a first amplifier 7, a switch 8, and an antenna 9, and the individual receiving unit includes an antenna 9, a switch 8, a second amplifier 10, a first piezoelectric substrate 4, a second electrode group,
It is composed of a switch 11, a second piezoelectric substrate 14, a second interdigital transducer 16, a unique coded interdigital transducer 15, switches 3 and 2, and a signal analyzer 13. The main receiver is an antenna 9, a switch 8, Second amplifier 10, first
It comprises a piezoelectric substrate 4, a second electrode group, a switch 11, a first relay interdigital electrode 12, an encoded interdigital electrode 5, switches 3 and 2, and a signal analyzer 13.

In the individual transmitting unit shown in FIG.
When a pulse is applied to 5, a unique coded surface acoustic wave is excited in the second piezoelectric substrate. Specific coding SAW is detected by the interdigital electrode C ₀ as unique coded burst signal corresponding to the specific code pattern, then, is detected again delayed by a time corresponding to the distance L at interdigital electrode C ₁ You. The combined output signal of the unique coded burst signal at the interdigital electrode C ₀ and the unique coded burst signal at the interdigital electrode C ₁ reaches the first amplifier 7 via the switch 6 and then via the switch 8. It is transmitted from the antenna 9.

In the main transmission section of FIG.
When a transmission message digital signal is applied from the input terminal 1 to the encoding IDT 5 via the input terminal 1, the pulse (1) of the pulses (0 and 1) of the transmission message digital signal is applied to the first piezoelectric substrate 4 by the pulse (1). An encoded surface acoustic wave is excited. At this time, since the coded IDT 5 has seven electrode pairs, the coded SAW is composed of seven burst waves corresponding to the code pattern of the coded IDT 5. Coded surface acoustic wave is detected at interdigital electrode A ₀ as coded burst signal, then, is again detected at interdigital electrode A ₁ is delayed by a time corresponding to the distance L.
The combined output signal of the coded burst signal at the interdigital electrode A ₀ and the coded burst signal at the interdigital electrode A ₁ arrives at the first amplifier 7 via the switch 6 and then to the switch 8.
Is transmitted from the antenna 9 via. At this time, each burst of the composite output signal and one burst at interdigital electrode A _0, consists of the immediately preceding burst at interdigital electrode A _1. For example, the third burst of the composite output signal and third burst at interdigital electrode A _0, made from the second burst at interdigital electrode A _1. Thus, the combined output signal contains a total of eight bursts. On the other hand, the surface acoustic wave is not excited on the first piezoelectric substrate 4 by the pulse (0) of the transmission message digital signal. as a result,
The transmission message digital signal is converted into a double coded burst signal including a non-burst period, and transmitted from the antenna 9.

In the individual receiving section shown in FIG.
When the unique double coded burst signal is received by
Specific double coded burst signal, after reaching the second amplifier 10 via a switch 8, a right interdigital electrode B _-1, are applied respectively to the left interdigital electrode B _1. At this time, the first
The first and second surface acoustic waves are excited on the piezoelectric substrate 4, respectively. The first surface acoustic wave reaches the central interdigital electrode B ₀ , and then delays by a time corresponding to the distance L, and then the second
SAW reaches the central interdigital electrode B _0. Therefore,
So that the burst wave of the previous one burst wave and the second surface acoustic wave of the first surface acoustic wave reaches simultaneously the center interdigital electrode B _0. In this way, the unique dual coded burst signal is converted to a unique single coded burst signal at the central interdigital electrode B _0. In this way, the first stage of decoding is achieved. When the unique single encoded burst signal is applied to the second relay interdigital transducer 16 via the switch 11, the unique single encoded surface acoustic wave is excited on the second piezoelectric substrate 14, and the unique single encoded surface acoustic wave is applied. The propagation direction of
It is opposite to the propagation direction of the unique coded surface acoustic wave in the individual transmitting unit in FIG. At this time, if the unique single encoded SAW correlates with the unique code pattern, the unique decoded pulse is detected by the unique encoded IDT 15. In this way, the second stage of decryption is achieved,
The unique coded IDT 15 functions as a ring switch. The unique decoding pulse is input to the signal analyzer 13 via the switches 3 and 2 without being affected by noise or an intruder.

In the main receiver of FIG. 1, if a received message double coded burst signal is received by an antenna 9, it reaches a second amplifier 10 via a switch 8. If the received message double coded burst signal is constituted by the double coded burst signal and no burst period, the double coded burst signal is a right interdigital electrode B _-1, left interdigital electrodes B ₁ Respectively applied to
Third and fourth surface acoustic wave is excited to the first piezoelectric substrate 4, the third and fourth surface acoustic wave is converted into single coded burst signal at the central interdigital electrode B _0. On the other hand, no surface acoustic wave is excited on the first piezoelectric substrate 4 during the non-burst period. In this way, the received message double encoded burst signal is converted to a received message single encoded burst signal. When the single coded burst signal is applied to the first relay interdigital transducer 12 through the switch 11, a single coded surface acoustic wave is excited on the first piezoelectric substrate 4, and the propagation direction of the single coded surface acoustic wave Is opposite to the propagation direction of the coded surface acoustic wave in the main transmission section in FIG.
At this time, if the single coded SAW correlates with the code pattern of the coded IDT 5, the decoded pulse is detected by the coded IDT 5. The decoded pulse is input to the signal analyzer 13 via the switches 3 and 2 without being affected by noise or an intruder. In this way, the received message single coded burst signal is converted into a received message burst signal. Therefore,
In the ultrasonic wireless communication system of FIG. 1, it is possible to construct a wireless communication network with excellent confidentiality.

FIG. 4 is an ultrasonic radio communication system according to the present invention.
FIG. 9 is a partial configuration diagram showing a second example of the first embodiment. Ultrasound of FIG.
The wireless communication system comprises switches 17, 18 and 19
And the interdigital electrode A_Two, A_Three, C_TwoAnd C_ThreeAnd the left screen
Pole B_TwoAnd B_ThreeFIG. 1 except that
It has the same structure as IDT A_TwoAnd A_ThreeIs one
Included in the pole group. IDT A₁And A_TwoIs the separation distance L
Having. IDT A _TwoAnd A_ThreeAlso the separation distance L
With aluminum thin film, 40μm electrode cycle length
Having. Left interdigital electrode B_TwoAnd B_ThreeIs included in the second electrode group.
I will. Left interdigital electrode B₁And B_TwoHas a separation distance L
You. Left interdigital electrode B_TwoAnd B_ThreeAlso has a separation distance L
And a 40 μm electrode cycle length
Have. Central interdigital electrode B₀And left interdigital electrode B_TwoSeparation from
The distance is L₀+ 2L, center interdigital electrode B₀And left blind
Electrode B_ThreeIs L₀+ 3L. IDT electrode C_TwoYou
And C_ThreeAre included in the third electrode group. IDT electrode C₁and
C_TwoHas a separation distance L. IDT electrode C_TwoAnd C_ThreeMoma
With a separation distance L of 40 μm
has an electrode period length of m. Input terminal 1, switch 2 and
And 3, the first amplifier 7, the switch 8, the antenna 9, the second
Amplifier 10 and switch 11 are not depicted in FIG.
No.

The ultrasonic radio communication system shown in FIG. 4 includes an individual transmission unit, a main transmission unit, an individual reception unit, and a main reception unit similar to those in FIG. However, the switch 17 belongs to both the individual receiving unit and the main receiving unit, and the switches 18 and 19 belong to the main transmitting unit and the individual transmitting unit, respectively.

In the individual transmitting section of FIG. 4, the same as in FIG.
Unique code from input terminal 1 via switches 2 and 3
When a pulse is applied to the interdigital transducer 15, a unique code
The surface acoustic wave is excited by the second piezoelectric substrate 14. Proper sign
The encoded surface acoustic wave has a unique code corresponding to the unique code pattern.
Interdigital electrode C as decoding burst signal₀Is detected by
After the delay corresponding to the distance L, 2L or 3L
Interlaced electrode C₁, C _TwoOr C_ThreeIs detected again. This
In the case of, the switch 19
Electrode C₁, C_TwoAnd C_ThreeCan choose one of
become. Thus, the interdigital electrode C₀Unique code in
Burst signal and interdigital electrode C₁, C_TwoOr C_ThreeIn solid
The composite output signal of the coded burst signal is the same as in FIG.
After reaching the first amplifier 7 via the switch 6,
It is transmitted from the antenna 9 via the switch 8.

In the main transmission section of FIG. 4, when a transmission message digital signal is applied from the input terminal 1 to the encoding IDT 5 through the switches 2 and 3 in the same manner as in FIG. The encoded surface acoustic wave is excited on the first piezoelectric substrate 4 by the pulse (1) of the pulses (0 and 1). At this time, since the coded IDT 5 has seven electrode pairs, the coded SAW is composed of seven burst waves corresponding to the code pattern of the coded IDT 5. Coded surface acoustic wave is detected at interdigital electrode A ₀ as coded burst signal, then the distance L, again delayed by a time corresponding to 2L or 3L at interdigital electrodes A _1, A ₂ or A ₃ Is detected. In this case, by adopting the switch 18, it is possible to select one of the interdigital electrodes A _1, A ₂ and A _3. In this way, the combined output signal of the coded burst signal in the coded burst signal and interdigital electrodes A _1, A ₂ or A ₃ in the interdigital electrode A ₀ is via a switch 6 in the same way as in FIG. 1 After reaching the first amplifier 7
Is transmitted from the antenna 9 via. At this time, each burst of the composite output signal is a n-th burst at interdigital electrode A _0, at interdigital electrode A _{1 (n-1)} th of a burst or interdigital electrodes A ₂ (n- 2) consists of th (n-3 in burst or interdigital electrodes a ₃₎ of th burst. For example,
6 th burst of the composite output signal and the sixth burst at interdigital electrode A _0, made from the third burst at interdigital electrode A _3. Thus, the combined output signal contains a total of 8, 9 or 10 bursts. On the other hand, the surface acoustic wave is not excited on the first piezoelectric substrate 4 by the pulse (0) of the transmission message digital signal. as a result,
The transmission message digital signal is converted into a double coded burst signal including a non-burst period, and transmitted from the antenna 9.

In the individual receiving section shown in FIG. 4, if the unique double coded burst signal is received by the antenna 9 in the same manner as in FIG. after reaching the amplifier 10, while being applied to the right interdigital electrode B _-1, it applied to the left interdigital electrodes B _1, B ₂ or B ₃ via a switch 17. At this time, a first surface acoustic wave corresponding to the right interdigital electrode B- ₁ and
A second surface acoustic wave corresponding to the left interdigital electrode B ₁ , B ₂ or B ₃ is excited by the first piezoelectric substrate 4. After the first surface acoustic wave reaches the central interdigital electrode B ₀ , the second surface acoustic wave reaches the central interdigital electrode B ₀ after being delayed by a time corresponding to the distance L, 2L or 3L, N of the first surface acoustic wave
Th at the same time as the burst wave to reach the central interdigital electrode B _0, the second surface acoustic wave (n-1) th, (n-2) th or
(n-3) th burst wave is left interdigital electrodes B _1, B ₂ or B
And it reaches the respective central interdigital electrode B ₀ to _3. For example, at the same time that the 4 th burst wave of the first surface acoustic wave reaches the central interdigital electrode B _0, 2 th burst wave of the second surface acoustic wave in the left interdigital electrodes B ₂ is the central interdigital transducer to reach the B _0. In this way, the unique dual coded burst signal is converted to a unique single coded burst signal at the central interdigital electrode B _0. The unique single coded burst signal is transmitted through the switch 11 as in FIG.
When applied to the interdigital transducer 16, a unique single coded surface acoustic wave is excited on the second piezoelectric substrate 14, and the propagation direction of the unique single coded surface acoustic wave is determined by the unique code in the individual transmitting unit in FIG. Is opposite to the propagation direction of the surface acoustic wave. At this time, if the unique single encoded SAW correlates with the unique code pattern, the unique decoded pulse is detected by the unique encoded IDT 15. In this manner, the unique coded IDT 15 functions as a ringing switch. The unique decoding pulse is input to the signal analyzer 13 via the switches 3 and 2 without being affected by noise or an intruder.

In the main receiving section of FIG. 4, if the received message double-coded burst signal is received by the antenna 9 in the same manner as in FIG. 2 The amplifier 10 is reached. When the received message double-coded burst signal is composed of a double-coded burst signal and a non-burst period, the double-coded burst signal is applied to the right interdigital electrode B- ₁ and When applied to the left interdigital electrode B ₁ , B ₂ or B ₃ via 17, the third surface acoustic wave corresponding to the right interdigital electrode B _-1 and the left interdigital electrode B ₁ , B ₂ or B ₃ Are excited in the first piezoelectric substrate 4. Third elastic after the surface wave reaches the central interdigital electrode B _0, the distance L, 2L or fourth SAW central interdigital transducer after delayed by a time corresponding to 3L
Since it reaches B ₀ , the (n−1) -th, (n−2) of the fourth surface acoustic waves are simultaneously generated when the n-th burst wave of the third surface acoustic wave reaches the central interdigital electrode B _0. ) th or (n-3) th burst wave is to reach each left interdigital electrodes B _1, B ₂ or B ₃ to the central interdigital electrode B _0. In this way, the double coded burst signal is
It is converted into single coded burst signal B _0. On the other hand, no surface acoustic wave is excited on the first piezoelectric substrate 4 during the non-burst period. As a result, the received message double coded burst signal is converted to a received message single coded burst signal. The single coded burst signal is supplied to the first interdigital transducer 1 via the switch 11 as in FIG.
2, the single coded surface acoustic wave is excited in the first piezoelectric substrate 4, and the direction of propagation of the single coded surface acoustic wave is opposite to the direction of propagation of the coded surface acoustic wave in the main transmission section of FIG. It is. At this time, if the single encoded SAW correlates with the code pattern of the IDT 5,
A decoding pulse is detected at the encoding IDT 5. The decoded pulse is input to the signal analyzer 13 via the switches 3 and 2 in the same manner as in FIG. 1 without being affected by noise or an intruder. In this way, the received message single coded burst signal is converted into a received message burst signal. Therefore, in the ultrasonic wireless communication system of FIG. 4, it is possible to construct a wireless communication network with excellent confidentiality.

FIG. 5 is a partial configuration diagram showing a third embodiment of the ultrasonic radio communication system according to the present invention. The ultrasonic wireless communication system shown in FIG. 1 has the same structure as that of FIG. 1 except that an intrinsically coded IDT 24 is used instead of 15 and a bipolar pulse generator 20 and a switch 21 are newly provided. The first amplifier 7, switch 8, antenna 9, second amplifier 10 and switch 11 are not depicted in FIG.

FIG. 6 is a plan view of the first encoding IDT 22. The first coded interdigital transducer 22 has three electrode pairs.
Consists P _i (i = 1, 2 and 3), two adjacent groups out of the electrode pairs P _i has a distance L, and each of the electrode pairs P _i 40
It has an electrode period length of μm. First coded IDT 2
2 has a first code pattern based on a Barker code. The second coded interdigital transducer 23 has a first code pattern except that it has a second code pattern different from the first code pattern.
It has a structure similar to that of the coded IDT 22. However,

FIG. 7 is a diagram showing the configuration of the unique encoding IDT 24. As shown in FIG. The unique coded IDT 24 has ten portions having the same structure as the first coded IDT 22,
It consists of six parts having the same structure as the second encoding IDT 23. In this way, the unique coded IDT 24 has a specific code pattern including 48 electrode pairs P _i.

The ultrasonic radio communication system shown in FIG. 5 includes an individual transmitting unit, a main transmitting unit, an individual receiving unit, and a main receiving unit similar to those in FIG. However, the bipolar pulse generator 20 belongs to the main transmitter, and the switch 21, the first coded IDT 22 and the second coded IDT 23 belong to both the main transmitter and the main receiver, The unique coded IDT 24 belongs to both the individual transmitter and the individual receiver.

In the individual transmitting section shown in FIG. 5, a unique encoding IDT 2 is input from an input terminal 1 via switches 2 and 3.
When a pulse is applied to 4, a unique encoded surface acoustic wave is excited on the second piezoelectric substrate 14. The unique coded surface acoustic wave is used as the IDT C ₀ as a unique coded burst signal corresponding to the unique code pattern of the unique coded IDT 24.
In is detected, then detected again delayed by a time corresponding to the distance L at interdigital electrode C _1. Composite output signal of the unique coded burst signal at the natural coded burst signal and interdigital electrodes C ₁ at interdigital electrode C ₀ consists of 49 bursts, one burst in each burst at interdigital electrode C ₀ If, consisting of one previous burst at interdigital electrode C _1. For example, the third burst of the composite output signal and third burst at interdigital electrode C _0, made from the second burst at interdigital electrode C _1. The combined output signal reaches the first amplifier 7 via the switch 6 in the same manner as in FIG. 1, and is transmitted from the antenna 9 via the switch 8.

In the main transmission section shown in FIG.
When a transmission message digital signal is applied to the bipolar pulse generator 20 from the input terminal 1 via the input terminal 1, bipolar pulses (−1 and 1) based on the transmission message digital signal are generated. When the bipolar pulses (−1 and 1) are applied to the first coded IDT 22 and the second coded IDT 23 via the switch 21, the first and second IDTs are applied to the first piezoelectric substrate 4. Two encoded surface acoustic waves are excited. The first coded surface acoustic wave corresponding to the first code pattern is detected as a first coded burst signal by the interdigital electrode A ₀ , and thereafter, after a delay corresponding to the distance L, the interdigital electrode A ₁ again. It is detected by. The first coded burst signal at the interdigital electrode A ₀ and the interdigital electrode A ₁
Each burst of the combined output signal of the first coded burst signal in a single burst at interdigital electrode A _0, consists of the immediately preceding burst at interdigital electrode A _1. As a result, the composite output signal contains a total of four bursts. Thus, the first encoded surface acoustic wave is converted into a first double encoded burst signal composed of four bursts. Similarly,
The second encoded surface acoustic wave corresponding to the second code pattern is
It is converted into a second double encoded burst signal composed of four bursts. The first and second double coded burst signals constitute a transmission message double coded burst signal. That is, the transmission message digital signal is converted to a transmission message double coded burst signal. This transmission message double coded burst signal reaches the first amplifier 7 via the switch 6 in the same manner as in FIG.
Is transmitted from the antenna 9 via.

In the individual receiving section of FIG. 5, the same as in FIG.
If the unique double coded burst signal by antenna 9
Is received, the unique double coded burst signal is
Right blind after reaching the second amplifier 10 via the switch 8
Electrode B_-1And the left interdigital electrode B₁Respectively applied to
You. At this time, the first and second elastic tables are provided on the first piezoelectric substrate 4.
Surface waves are excited respectively. 1st surface acoustic wave
Reed-shaped electrode B₀And then only for the time corresponding to the distance L
After the delay, the second surface acoustic wave is applied to the center interdigital electrode B ₀Reached
Reach. Therefore, one burst wave of the first surface acoustic wave and
The burst wave immediately before the second surface acoustic wave is the central interdigital
Pole B₀At the same time. In this way,
The duplex coded burst signal is applied to the center interdigital electrode B.₀Unique in
It is converted into a single coded burst signal. Unique single encoding
The burst signal is transmitted through the switch 11 as in FIG.
2 When applied to the interdigital transducer 16, the second piezoelectric substrate
A unique single coded surface acoustic wave is excited on the plate 14,
The propagation direction of the double coded surface acoustic wave is determined by the individual transmitting unit in FIG.
The direction is the reverse of the propagation direction of the eigen-coded surface acoustic wave. This
, If the eigen-single coded surface acoustic wave is eigen-encoded
When correlated with the unique code pattern of the IDT 24
Is that the unique decoding pulse is at the unique encoding IDT 24
Is detected. In this way, the unique encoding IDT
Reference numeral 24 functions as a call switch. Proper restoration
Decoded pulses are not affected by noise or intruders
Input to the signal analyzer 13 via the switches 3 and 2
Is done.

In the main receiving section of FIG. 5, if the received message double-coded burst signal is received by the antenna 9 in the same manner as in FIG. 2 The amplifier 10 is reached. If the received message double coded burst signal comprises a first and a second double coded burst signal, the first double coded burst signal is transmitted to the right interdigital electrode.
And B _-1, when each is applied to the left interdigital electrodes B _1, third and fourth surface acoustic wave is excited to the first piezoelectric substrate 4, the third and fourth surface acoustic wave central interdigital transducer
At B ₀ , it is converted to a first single coded burst signal. Thus, the first double coded burst signal is converted into the first single coded burst signal. Similarly, the second double coded burst signal is converted to a second single coded burst signal. As a result, the received message double coded burst signal is converted to a received message single coded burst signal. When the first and second single-encoded burst signals are applied to the first relay interdigital transducer 12 through the switch 11 as in FIG. 1, the first and second single-encoded burst signals are applied to the first piezoelectric substrate 4. Each of the surface acoustic waves is excited. The propagation directions of the first and second single coded surface acoustic waves are opposite to the propagation directions of the first and second coded surface acoustic waves in the main transmission unit in FIG. At this time, if the first single encoded SAW correlates with the first encoded pattern of the first encoded IDT 22, the first decoded pulse is set to the first encoded pulse.
If the second single coded surface acoustic wave is detected by the coded interdigital transducer 22 and correlates with the second coded pattern of the second coded interdigital transducer 23, then the second decoded pulse is the second coded interdigital transducer. It is detected by the electrode 23. The first and second decoding pulses are not affected by noise or intruders,
The signal is input to the signal analyzer 13 via the switch 21. In this way, the received message single coded burst signal is converted into a received message burst signal. Therefore,
In the ultrasonic wireless communication system of FIG. 5, it is possible to construct a wireless communication network with excellent confidentiality.

FIG. 8 is a partial configuration diagram showing a fourth embodiment of the ultrasonic radio communication system according to the present invention. The ultrasonic wireless communication system in FIG. 8 includes an input terminal 1, switches 2 and 3, a first piezoelectric substrate 4, a switch 6, a first amplifier 7, a switch 8, an antenna 9, a second amplifier 10, a switch 11,
First interdigital transducer 12, signal analyzer 13, second piezoelectric substrate 14, second interdigital transducer 16, switch 1
7, 18 and 19, bipolar pulse generator 20, switch 21, first coded interdigital electrode 22, second coded interdigital electrode 23, unique coded interdigital electrode 24, first electrode group, second electrode And a third electrode group. The first electrode group, the second electrode group, and the third electrode group have the same structure as in FIG. First amplifier 7, switch 8, antenna 9, second amplifier
Amplifier 10 and switch 11 are not shown in FIG.

The ultrasonic radio communication system shown in FIG. 8 includes an individual transmitting section, a main transmitting section, an individual receiving section, and a main receiving section, as in FIG. The individual transmitting section is composed of the input terminal 1, the switches 2 and 3, the second piezoelectric substrate 14, the unique encoding IDT 24, the third electrode group, the switches 19 and 6, the first amplifier 7, the switch 8, and the antenna 9. The main transmitting section includes an input terminal 1, switches 2 and 3, a bipolar pulse generator 20, a switch 21, a first piezoelectric substrate 4, a first encoded interdigital transducer 22, a second encoded interdigital transducer 23, A first electrode group, switches 18 and 6,
The individual receiving unit includes the first amplifier 7, the switch 8, and the antenna 9, and the individual receiving unit includes the antenna 9, the switch 8, the second amplifier 10, the switch 17, the first piezoelectric substrate 4, the second electrode group, the switch 11, and the second piezoelectric substrate. 14, a second relay interdigital transducer 16, a unique encoding interdigital transducer 24, switches 3 and 2, and a signal analyzer 13.
The main receiving unit is an antenna 9, a switch 8, a second amplifier 10,
Switch 17, first piezoelectric substrate 4, second electrode group, switch 11, first interdigital transducer 12, first encoded interdigital transducer 22, second encoded interdigital transducer 23, switch 2.
1 and a signal analyzer 13.

In the individual transmitting section shown in FIG. 8, the unique encoding IDT 2 is input from the input terminal 1 via the switches 2 and 3.
When a pulse is applied to 4, a unique encoded surface acoustic wave is excited on the second piezoelectric substrate 14. The unique coded surface acoustic wave is used as the IDT C ₀ as a unique coded burst signal corresponding to the unique code pattern of the unique coded IDT 24.
, And then detected again at the interdigital electrodes C ₁ , C ₂ or C ₃ after a delay corresponding to the distance L, 2 L or 3 L. In this case, by adopting the switch 19, it is possible to select one of the interdigital electrodes C _1, C ₂ and C _3. In this way, the interdigital electrodes
The unique coded burst signal at C ₀ and the interdigital electrodes C ₁ and C ₂
Or composite output signal of the unique coded burst signal at C _3, the first amplifier 7 via switch 6 in the same manner as in FIG. 1
Are transmitted from the antenna 9 via the switch 8.

In the main transmission section of FIG.
From the input terminal 1 to the bipolar pulse generator 20 via the
When a digital message is applied,
Pulse (−1 and
1) occurs. This bipolar pulse (-1 and 1)
First encoded interdigital transducer 22 and second encoded interdigital transducer
Applied to the electrode 23 via the switch 21
And the first and second encoded surface acoustic waves are applied to the first piezoelectric substrate 4.
Is excited. First encoding corresponding to first code pattern
The surface acoustic wave is interdigital as the first encoded burst signal.
Electrode A₀, Then correspond to distance L, 2L or 3L
Electrode A after delaying₁, A _TwoOr A_Three
Is detected again. At this time, the switch 18 is adopted.
The interdigital electrode A₁, A_TwoAnd A_ThreeOne of
Can be selected. IDT A₀First in
Coded burst signal and interdigital electrode A₁, A_TwoOr A_Three
Each burst of the combined output signal of the first encoded burst signal at
Is the interdigital electrode A₀The nth burst at the blinds
Electrode A₁(N-1) th Burst IDT A_Twoso
(N-2) th Burst IDT A_Three(N-3) th in
Consisting of bursts. Thus, the first encoded elasticity
The surface wave is the fourth of a total of 4, 5 or 6 bursts
The signal is converted into a single double coded burst signal. Similarly,
The second encoded surface acoustic wave corresponding to the second code pattern is
Second double code consisting of a total of 4, 5 or 6 bursts
Is converted into a burst signal. First and second double codes
The encoded burst signal is the transmitted message double encoded burst signal.
Constitution of the issue. That is, the transmitted message digital signal
The transmitted message is converted to a double coded burst signal
You. This transmitted message double coded burst signal is
Reach the first amplifier 7 via the switch 6 in the same manner as 1.
Is transmitted from the antenna 9 via the switch 8
You.

In the individual receiving section shown in FIG. 8, when the unique double coded burst signal is received by the antenna 9 in the same manner as in FIG. after reaching the amplifier 10, while being applied to the right interdigital electrode B _-1, it applied to the left interdigital electrodes B _1, B ₂ or B ₃ via a switch 17. At this time, a first surface acoustic wave corresponding to the right interdigital electrode B- ₁ and
A second surface acoustic wave corresponding to the left interdigital electrode B ₁ , B ₂ or B ₃ is excited by the first piezoelectric substrate 4. After the first surface acoustic wave reaches the central interdigital electrode B ₀ , the second surface acoustic wave reaches the central interdigital electrode B ₀ after being delayed by a time corresponding to the distance L, 2L or 3L, N of the first surface acoustic wave
Th at the same time as the burst wave to reach the central interdigital electrode B _0, the second surface acoustic wave (n-1) th, (n-2) th or
(n-3) th burst wave is left interdigital electrodes B _1, B ₂ or B
And it reaches the respective central interdigital electrode B ₀ to _3. In this way, the unique dual coded burst signal is converted to a unique single coded burst signal at the central interdigital electrode B _0. When the unique single coded burst signal is applied to the second relay interdigital transducer 16 via the switch 11 as in FIG. 1, the unique single coded surface acoustic wave is excited on the second piezoelectric substrate 14, and The propagation direction of the single coded surface acoustic wave is opposite to the propagation direction of the unique coded surface acoustic wave in the individual transmission unit in FIG. At this time, if the unique single coded SAW correlates with the unique code pattern of the unique coded IDT 24, the unique decoded pulse is detected by the unique coded IDT 24. In this way,
The unique encoding IDT 24 functions as a ring switch. The unique decoding pulse is input to the signal analyzer 13 via the switches 3 and 2 without being affected by noise or an intruder.

In the main receiving section of FIG. 8, even if it is the same as FIG.
If the received message double coded burst signal is
9, the received message double encoding
The boost signal reaches the second amplifier 10 via the switch 8
I do. The received message double coded burst signal is
And the second double coded burst signal.
In this case, the first double coded burst signal is
B_-1At the same time, and left through the switch 17.
Dripping electrode B₁, B_TwoOr B_ThreeWhen applied to the right blind
Electrode B_-1Surface acoustic wave and left IDL corresponding to
Pole B₁, B_TwoOr B _ThreeThe fourth surface acoustic wave corresponding to
The substrate 4 is excited. Third surface acoustic wave
Pole B₀After reaching, the time corresponding to the distance L, 2L or 3L
After the delay, the fourth surface acoustic wave is₀
, The nth berth of the third surface acoustic wave
Center wave interdigital electrode B₀At the same time as
(N-1) th, (n-2) th or (n-3) th of surface acoustic wave
Burst wave left interdigital electrode B₁, B_TwoOr B_ThreeFrom center
Dripping electrode B₀Will be reached respectively. like this
And the first double coded burst signal is the center interdigital
Pole B₀Is converted into a single coded burst signal. Likewise
And the second double coded burst signal is the second single coded burst signal.
Is converted to a strike signal. As a result, the received message
The double coded burst signal is the single coded bar of the received message.
Is converted to a strike signal. First and second single encoding bars
The strike signal is transmitted through the switch 11 as in FIG.
When applied to the interdigital transducer 12, the first piezoelectric substrate 4
First and second single coded surface acoustic waves are excited respectively
Is done. Propagation method of first and second single coded surface acoustic waves
The direction is the first and second encoded elasticity in the main transmission unit in FIG.
The propagation directions of the surface waves are opposite to each other. At this time,
The first single coded surface acoustic wave also has a first coded IDT
22 if it is correlated with the first code pattern
Pulse is detected at the first coded IDT 22,
The double coded SAW is applied to the second coded IDT 23
If the second decoding pattern is correlated with the second decoding pattern,
Loose is detected at the second coded IDT 23. First
And the second decoding pulse are affected by noise and intruders.
To the signal analyzer 13 via the switch 21
Is entered. In this way, the received message single code
Coded burst signals are converted to received message burst signals.
It is. Therefore, in the ultrasonic wireless communication system of FIG.
Can build a wireless communication network with excellent concealment
It works.

[0048]

The ultrasonic radio communication system of the present invention comprises a radio communication device and a personal card inserted therein. The wireless communication device includes a first piezoelectric substrate, a coded IDT, a first electrode group, a first amplifier, an antenna, a second amplifier, a second electrode group, a first relay IDT, and a signal analyzer; The personal card includes a second piezoelectric substrate, a unique coded IDT, a third electrode group, and a second relay IDT.

The ultrasonic radio communication system according to the present invention includes an individual transmitting section, a main transmitting section, an individual receiving section, and a main receiving section. The individual transmitting unit includes a second piezoelectric substrate, a unique coded IDT, a third electrode group, a first amplifier, and an antenna. The main transmitting unit includes a first piezoelectric substrate, a coded IDT, a first electrode group, A first amplifier and an antenna, wherein the individual receiving unit is an antenna, a second amplifier,
It comprises a first piezoelectric substrate, a second group of electrodes, a second piezoelectric substrate, a second interdigital transducer, a unique coded interdigital transducer, and a signal analyzer, and the main receiver is an antenna, a second amplifier, a first piezoelectric transducer. It comprises a substrate, a second electrode group, a first interdigital transducer, a coded interdigital transducer, and a signal analyzer. According to such an ultrasonic wireless communication system of the present invention, it is possible to construct a wireless communication network excellent in confidentiality without being affected by noise or an intruder.

In the ultrasonic wireless communication system of the present invention, a structure is possible in which the coded IDT comprises at least three electrode pairs. In addition, the unique coded IDT is composed of multiple multiples of 4, at least one of the portions has the same structure as the coded IDT, and the rest are all electrodeless finger structures. It is possible. In this case, the electrodeless finger structure has a size similar to the appearance of the coded IDT.

In the ultrasonic radio communication system of the present invention, a structure in which a bipolar pulse generator is newly used and first and second coded IDTs are used instead of coded IDTs is possible. It is. However, the bipolar pulse generator belongs to the main transmitter. Also, in such an ultrasonic wireless communication system, the first and second coded IDTs each comprise at least three electrode pairs, and the unique coded IDTs comprise multiples of four parts, and Each of the portions has a structure similar to the first or second coded IDT. According to such a structure, it is possible to construct a wireless communication network that is more excellent in secrecy.

In the ultrasonic radio communication system according to the present invention,
At least two interdigital electrodes A with one electrode group_i {i = 1, 2,
, (N-1)}, and the second electrode group has at least two grids.
Dripping electrode B_i Third electrode group including {i = 1, 2, ..., (n-1)}
Has at least two interdigital electrodes C_i {i = 1, 2,…, (n-
1)} is possible. In this case, the interdigital electrode A
_iID electrode A₀From the distance iL (i = 1, 2, ..., (n
-1)} apart. In addition, the left interdigital electrode B_iIs the center
Dripping electrode B₀Distance L from₀+ iL {i = 1, 2,…, (n-
1)} apart. Further, the interdigital electrode C_iBamboo blind
Electrode C₀From the distance iL {i = 1, 2,…, (n-1)}
is seperated. By adopting such a structure,
Can further enhance the confidentiality of line communication networks
Becomes

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of an ultrasonic wireless communication system according to the present invention.

FIG. 2 is a plan view of an encoding IDT 5;

FIG. 3 is a plan view of a unique encoding IDT 15;

FIG. 4 is a partial configuration diagram showing a second embodiment of the ultrasonic wireless communication system of the present invention.

FIG. 5 is a partial configuration diagram showing a third embodiment of the ultrasonic wireless communication system of the present invention.

FIG. 6 is a plan view of a first encoding IDT 22;

FIG. 7 is a configuration diagram of a unique encoding IDT 24;

FIG. 8 is a partial configuration diagram showing a fourth embodiment of the ultrasonic wireless communication system according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Input terminal 2 Switch 3 Switch 4 1st piezoelectric substrate 5 Encoding IDT 6 Switch 7 1st amplifier 8 Switch 9 Antenna 10 2nd amplifier 11 Switch 12 1st relay IDT 13 Signal analyzer 14 2nd Piezoelectric substrate 15 Unique coded interdigital electrode 16 Second relay interdigital electrode 17, 18, 19 Switch 20 Bipolar pulse generator 21 Switch 22 First coded interdigital electrode 23 Second coded interdigital electrode 24 Unique code Interdigital electrodes A ₀ , A ₁ , A ₂ , A ₃ Interdigital electrodes B ₀ Center interdigital electrodes B _-1 Right interdigital electrodes B ₁ , B ₂ , B ₃ Left interdigital electrodes C ₀ , C ₁ , C ₂ , C ₃ interdigital transducer

Claims (7)

[Claims] 1. An ultrasonic wireless communication system comprising a wireless communication device and a personal card, wherein the wireless communication device includes a first piezoelectric substrate, a coded IDT, a first electrode group, a first amplifier, an antenna, The personal card comprises a second amplifier, a second group of electrodes, a first interdigital transducer, and a signal analyzer, wherein the personal card has a second piezoelectric substrate, a unique coded interdigital transducer, a third electrode family, and a second interdigital transducer. And the coded IDT includes an electrode pair P _i (i = 1,
2,..., N), two adjacent pairs of the electrodes P _i have a distance L, the coded IDT has a predetermined code pattern, and the first electrode group has IDT A ₀
When the distance from the interdigital electrode A ₀ iL (i = 1) consists apart interdigital electrodes A _{i (i} = 1), the second electrode group and the central interdigital electrode B _0, the central interdigital right interdigital electrodes away from the electrode B ₀ by a distance L ₀ B _{- 1} and the central interdigital electrode B
₀ from the distance _{L 0 + iL (i = 1} ) apart left interdigital electrodes B _i (i =
1), wherein the unique coded IDT includes the electrode pair P _i corresponding to the coded IDT,
The unique coded interdigital transducer has a unique code pattern, and the third electrode group includes an interdigital transducer C ₀ and an interdigital transducer C _i separated from the interdigital transducer C ₀ by a distance iL (i = 1). (i =
1), wherein the second piezoelectric substrate, the unique encoding IDT, the third electrode group, the first amplifier, and the antenna constitute an individual transmitting unit, and the first piezoelectric substrate, the encoding IDT A main transmitting unit is formed by the shape electrode, the first electrode group, the first amplifier, and the antenna, and the antenna, the second amplifier, the first piezoelectric substrate, the second electrode group, the second piezoelectric substrate, The second relay interdigital transducer, the unique encoding interdigital transducer and the signal analyzer constitute an individual receiving unit, and the antenna, the second amplifier, the first piezoelectric substrate, the second electrode group, A first receiving interdigital electrode, the coded interdigital electrode and the signal analyzer constitute a main receiving unit. In the individual transmitting unit, a pulse is applied to the unique coded interdigital electrode. By the the second piezoelectric substrate is specific coded SAW is excited, the unique coded surface acoustic wave, the detected at interdigital electrode C ₀ as unique coded burst signal corresponding to the specific code pattern and then, the distance iL again after a delay to time corresponding to the detected at interdigital electrodes C _i, the unique in the unique coded burst signal and the interdigital electrodes C _i in the interdigital electrode C ₀ The combined output signal of the coded burst signal is transmitted from the antenna via the first amplifier, and the main transmitting unit applies a transmission message digital signal to the coded IDT, thereby transmitting the first signal. coded surface acoustic waves are excited in the piezoelectric substrate, the coded surface acoustic wave, after being detected by the interdigital electrode a ₀ as coded burst signal corresponding to the code pattern, Serial distance iL is detected again after a delay to time corresponding the interdigital electrode A _i, the said coded burst signal and the coded burst signal at the interdigital electrode A _i in the interdigital electrode A ₀ The combined output signal is transmitted from the antenna via the first amplifier, and in the individual receiving unit, when the unique double coded burst signal is received by the antenna,
The unique double coded burst signal is passed through the second amplifier to the right interdigital electrode B _-1 and the left interdigital electrode B _i.
Each is applied to the the first piezoelectric substrate first and second surface acoustic waves are excited, respectively, the first and second surface acoustic wave in said central interdigital transducer B ₀ unique single coded burst signal The unique single-coded surface acoustic wave is excited by the converted single-coded burst signal being applied to the second relay interdigital transducer, whereby the unique single-coded surface acoustic wave is excited. The propagation direction of the wave is opposite to the propagation direction of the unique coded surface acoustic wave in the individual transmission unit, and if the unique single encoded surface acoustic wave is correlated with the unique code pattern, the unique decoding A pulse is detected at the unique encoding IDT, the unique decoding pulse is input to the signal analyzer, and at the main receiver, the received message double encoded burst signal is transmitted to the amplifier. Once received by the burner, the received message double coded burst signal and the right interdigital electrode B _-1 through the second amplifier, respectively, is applied to the left interdigital electrodes B _i, the first third and fourth surface acoustic waves are excited respectively in the piezoelectric substrate, said third and fourth surface acoustic wave is converted into single coded burst signal at said central interdigital transducer B _0, the single coded burst signal A single coded surface acoustic wave is excited on the first piezoelectric substrate by being applied to the first interdigital transducer, and the direction of propagation of the single coded surface acoustic wave is determined by the coding in the main transmitting unit. The direction of propagation of the surface acoustic wave is opposite, and if the single coded surface acoustic wave is correlated with the code pattern, a decoded pulse is detected at the coded IDT and the decoded pulse is detected. Ultrasonic wireless communication system inputted to the signal analyzer. 2. The method according to claim 1, wherein said coded IDT has at least three electrodes.
The ultrasonic wireless communication system according to claim 1, comprising one electrode pair. 3. The unique coded interdigital transducer comprises a multiple of four parts, at least one of which has a similar structure to the coded interdigital transducer, and all the rest being electrodeless. 3. The ultrasonic wireless communication system according to claim 1, wherein a finger structure is formed, and the electrodeless finger structure has a size similar to an appearance of the coded IDT. 4. An ultrasonic wireless communication system comprising a wireless communication device and a personal card, wherein the wireless communication device includes a first piezoelectric substrate, a bipolar pulse generator, first and second coded interdigital transducers, The personal card includes a first electrode group, a first amplifier, an antenna, a second amplifier, a second electrode group, a first relay interdigital electrode, and a signal analyzer. The personal card includes a second piezoelectric substrate, a unique encoding interdigital electrode. , A third electrode group and a second relay IDT, wherein the first and second coded IDTs are respectively an electrode pair P _i (i =
1, 2 ..., consist n), 2 two adjacent groups out of the electrode pairs P _i has a distance L, the first and second coded IDT includes first respectively and second The first electrode group has a code pattern, and the interdigital electrode A ₀ and the interdigital electrode A _i separated from the interdigital electrode A ₀ by a distance iL (i = 1).
(i = 1), and the second electrode group has a center interdigital electrode B ₀
When a right interdigital electrode B _-1 at a distance L ₀ from the central interdigital electrode B _0, the distance from the central interdigital electrode B ₀ L ₀ +
consists of left interdigital electrodes B _i (i = 1) separated by iL (i = 1),
The unique coded IDT includes the electrode pair P _i corresponding to the coded IDT, the unique IDT has a unique code pattern, and the third electrode group has an IDT. Electrode C ₀ and the distance from the interdigital electrode C ₀
iL (i = 1) separated by interdigital transducers C _i (i = 1), the second piezoelectric substrate, the unique coded interdigital transducer, the third electrode group, the first amplifier and the antenna An individual transmitting unit is configured, and a main transmitting unit is configured by the first piezoelectric substrate, the bipolar pulse generator, the first and second encoded IDTs, the first electrode group, the first amplifier, and the antenna. The antenna, the second amplifier, the first piezoelectric substrate, the second electrode group, the second piezoelectric substrate, the second relay IDT, the unique encoding IDT, and the signal analyzer The antenna, the second amplifier, the first piezoelectric substrate, the second electrode group, the first relay IDT, the first and second coded IDTs, and By signal analyzer A receiving unit is configured, and in the individual transmitting unit, a pulse is applied to the unique coded IDT, whereby a unique coded surface acoustic wave is excited on the second piezoelectric substrate, and the unique coded surface acoustic wave is excited. waves, after the detected at interdigital electrode C ₀ as unique coded burst signal corresponding to the specific code pattern, the distance iL
Is detected again at the interdigital electrode C _i with a delay corresponding to the above, and a combination of the unique encoded burst signal at the interdigital electrode C ₀ and the unique encoded burst signal at the interdigital electrode C _i An output signal is transmitted from the antenna via the first amplifier, and the main transmission unit applies a transmission message digital signal to the bipolar pulse generator to generate a bipolar pulse (−1 and 1). Are generated, and the bipolar pulses (-1 and 1) are applied to the first and second coded IDTs, respectively, so that the first and second coded elastic plates are applied to the first piezoelectric substrate. The surface waves are excited respectively, and the first and second
Coded surface acoustic wave, after being detected by the interdigital electrode A ₀ as the first and second coded burst signal corresponding to said first and second code pattern, said distance iL
Only time corresponding detected again the interdigital electrode A _i and delay, and the combined output signal of each of the first coded burst signal at the interdigital electrodes A ₀ and A _i, the interdigital electrode A A combined output signal of the second coded burst signals at ₀ and A _i is transmitted from the antenna via the first amplifier, and in the individual receiving unit, the unique double coded burst signal is transmitted by the antenna. When There is received, the unique dual coded burst signal and the right interdigital electrode B _-1 through the second amplifier, respectively, is applied to the left interdigital electrodes B _i, the first piezoelectric substrate First and second surface acoustic waves are excited, respectively,
And the second surface acoustic wave is converted into a unique single coded burst signal by the central interdigital electrode B ₀ , and the unique single coded burst signal is applied to the second relay interdigital electrode, whereby the second (2) A unique single coded surface acoustic wave is excited in the piezoelectric substrate, and a propagation direction of the unique single coded surface acoustic wave is opposite to a propagation direction of the unique coded surface acoustic wave in the individual transmitting unit. If the unique single encoded SAW correlates with the unique code pattern, a unique decoding pulse is detected at the unique coding IDT, and the unique decoding pulse is input to the signal analyzer, In the main receiver, when a received message double encoded burst signal is received by the antenna,
The received message double coded burst signal is the second
And the right interdigital electrode B _-1 through an amplifier, the left respectively are applied to the interdigital electrodes B _i, the third and fourth surface acoustic wave is excited to each of the first piezoelectric substrate, wherein the received message two The double coded burst signal comprises first and second double coded burst signals, and the third and fourth surface acoustic waves based on the first double coded burst signal are applied to the central interdigital electrode B _0. in are converted into a first single coded burst signal, said third and fourth surface acoustic wave based on said second double coded burst signal, to the second single coded burst signal at said central interdigital electrode B ₀ When converted and the first and second single encoded burst signals are applied to the first relay IDT, first and second single encoded surface acoustic waves are excited on the first piezoelectric substrate, The first and second singlet The direction of propagation of the encoded surface acoustic wave is opposite to the direction of propagation of the first and second encoded surface acoustic waves in the main transmitting unit, respectively, and if the first and second single encoded surface acoustic waves are When correlating with the first and second code patterns, respectively, the first and second code patterns
An ultrasonic wireless communication system wherein a decoded pulse is detected at said first and second encoded interdigital transducers, respectively, and a combined output signal of said first and second decoded pulses is input to said signal analyzer. 5. The method according to claim 1, wherein said first and second coded interdigital transducers each comprise at least three electrode pairs.
5. The ultrasonic wireless communication system according to 2, 3, or 4. 6. The unique coded IDT comprising a multiple of four portions, each of which has a structure similar to the first or second coded IDT.
Or the ultrasonic wireless communication system according to 5. 7. The first electrode group includes at least two interdigital electrodes A _i {i = 1, 2,..., (N−1)}, and the at least two interdigital electrodes A _i are the interdigital electrodes. Each electrode is separated from the electrode A ₀ by a distance iL {i = 1, 2,..., (N−1)}, and the second electrode group includes at least two left interdigital electrodes B _i {i = 1,
2, ..., (n-1 ) includes a}, wherein at least two left interdigital electrodes B _i distance respectively from the center interdigital electrode B ₀ L ₀ + i
L {i = 1,2,..., (N-1)}, and the third electrode group includes at least two interdigital electrodes C _i {i = 1, 2,.
1) a}, wherein at least two interdigital transducers C _i is the respective the interdigital electrode C ₀ distance iL {i = 1, 2, ..., (n-
1)}, 2, 3, 4, 5 or 6 apart.
2. The ultrasonic wireless communication system according to claim 1.