JPH08237711A - Voice pager and data transmission method in central control station - Google Patents

Abstract

PURPOSE: To obtain the pager and the data transmission method for the pager in which a radio wave is effectively utilized by selecting optimum coding required for reproducing a sound wave and by which not only voice information bus also music information is sent with a required minimum data capacity. CONSTITUTION: A voice conversion means is provided with a memory 14 storing at least two sets of coding processing algorithm 32 and a DSP 13 applying decoding processing to received data. Thus, it is possible to properly select message data processed by plural coding systems in matching with the sound wave band and to send the selected message data. Then the coded data capacity is minimized, resulting that the time required to send the message is reduced when the transmission speed is the same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio pager such as a so-called pager, and more particularly to a radio pager having a function of receiving and reproducing voice information and music information.

[0002]

2. Description of the Related Art In recent radio call receivers,
There is a shift from a conventional receiver that makes a call with a simple ringing tone to a highly functional receiver that transmits numerical and character information to the receiver and displays it on the receiver. It is considered that the audio information is transmitted to and reproduced from a receiver as a further advance of this high function, and US Pat.
No. 9 and JP-A-4-339424 are filed.

In order to transmit these voice messages and music information, the capacity of the digitized information is remarkably large as compared with the amount of information such as letters and numbers, so that these voice and music information are transmitted. Needed a great deal of time. As a method for solving this problem, it is possible to reduce the time required for transmission by performing a highly efficient encoding process for efficiently converting voice and music information into a small amount of data.

In the case of encoding a human voice as such an encoding processing method, linear predictive encoding (LPC) or the like sufficient for sound wave reproduction of about 4 KHz can be used. When transmitting such a general conversation, it is possible to reproduce sound waves by linear predictive coding (LPC) with a small data capacity, and the data transmission time is also short.

However, since it is practically impossible to process data such as music information by this linear predictive coding method, when it comes to processing music information and voice together, an operation dedicated to coding processing is performed. It is necessary to use a circuit and select an encoding method that has a sufficient reproduction band. For example, when reproducing music information, since sound wave reproduction of about 20 KHz is required, waveform coding methods such as PCM, ADPCM, and ADM are mainly suitable, and the data capacity is at least 16 Kbits per second ( Hereinafter, abbreviated as 16 Kbps) or more is required.

Therefore, if all the information is to be processed by the waveform coding system, even when transmitting, for example, voice information other than music information, the data capacity of 16 Kbps is significantly larger than the data capacity of the linear predictive coding system. Because of the large capacity, it takes much time to transmit the same voice information as compared to linear predictive coding (LPC), etc. Considering the current situation that voice information communication using telephone etc. occupies the majority. Therefore, there is a problem in that the radio waves cannot be effectively used and the number of subscribers that can be accommodated in one frequency channel is significantly reduced.

Further, in the case where the voice information or the music information is received and reproduced as described above, if a third party asks for such information, the privacy of the individual is significantly impaired. Since there is a problem, in order to prevent third parties from listening to each of the above information transmitted, a number string with a specified number of digits is registered in advance in the receiver, and the received information There has been devised a password system or the like for inputting this number string of a predetermined number of digits at the time of displaying and reproducing, and confirming whether or not the operating person is the owner.

However, in order to input the number string corresponding to these passwords, it is necessary to attach an input key for inputting to the receiver, but since the pager is portable, these number strings are to be carried. When the input key for inputting is attached, there is a problem that the pager body becomes large and the portability is impaired. Conversely, if you try to enter the number string using few keys so as not to impair portability, the operation will be extremely However, there is a problem that it becomes complicated and the practicality is significantly impaired.

Therefore, as a method of easily confirming whether the operator is the pager owner himself or herself, the present inventors have registered a predetermined password voice of the pager owner in the memory. Then, we have proposed a technique to secure confidentiality by voice recognition that identifies the speaker compared to the voice input of the operator, but in this case, circuits to perform these voice recognition will be added individually. However, since the number of parts is increased, the cost is increased, and the size and weight of the pager itself are increased.

[0010]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned various problems, and the first object of the present invention is to select the optimum coding required for sound wave reproduction, thereby (EN) A pager capable of effectively utilizing the above and transmitting not only voice but also music information with a minimum required data capacity, and a data transmission method therefor.

A second object of the present invention is to provide a pager which has the concealment that a specific speaker can be confirmed by using voice recognition, and this voice recognition is excellent in portability and can be realized at low cost. That is.

[0012]

In order to solve the above-mentioned problems, a voice pager of the present invention comprises a receiving means for receiving a radio wave obtained by digitally modulating encoded message data, and a data storing means for storing the received data. Memory means,
In a voice pager provided with a voice conversion means for decoding the received data in the data memory and D / A converting it to a voice by a switch operation, the voice converting means stores at least two encoding processing algorithms. And a digital signal processor (DSP) that reads a specific encoding processing algorithm from the memory and decodes specific reception data, and has at least two different encoding processings. The feature is that the message data can be encoded and reproduced by one DSP.

A data transmission method in a central control station according to the present invention is a data transmission method in which a radio wave obtained by digitally modulating encoded message data is transmitted to a voice pager, wherein the message data to be transmitted has individual address data and a code. When the message data to be sent is voice information, the signal data of the processing method used in the encoding process is added, and when the message data to be sent is voice information, the message data coded by the linear predictive coding method and the message data to be sent are music. In the case of information, it is characterized in that the message data coded by the waveform predictive coding method is selected and transmitted.

The voice pager of the present invention comprises a receiving means for receiving radio waves obtained by digitally modulating encoded message data, a data memory means for storing the received data, and a received data in the data memory by a switch operation. Voice conversion means for decoding, D / A converting, and converting into voice, the voice means storing at least one encoding processing algorithm, and a specific encoding processing algorithm from the memory. In a voice pager comprising a digital signal processor (DSP) for reading and decoding specific received data, the memory further stores a voice recognition algorithm and encoded data of a voice password, and stores in the memory. Encoded processing algorithms, speech recognition algorithms, and speech passwords. The de of the encoded data read each optionally wherein the digital signal processor (DSP), is characterized in that to allow the speech recognition processing in the DSP.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the following embodiments. FIG. 1 is a block diagram of the first embodiment of the present invention.

Reference numeral 1 denotes a receiving means for detecting an antenna 2 and an electric wave, an RF circuit 3 for demodulating modulated digital data, and a pager address signal from the demodulated digital data, which is already stored in the memory 16 of the pager main body. The comparator 4 is configured to compare with registered pager address data. At the central control station (not shown), A
It is digitized by D / D conversion and encoding, the pager address signal is added to this digitized data, and the encoded signal corresponding to the encoding method used for the above encoding is added and then this is digitally modulated. And send.

The encoding method used for the above-mentioned encoding is suitable for encoding the voice, for example, when the data to be encoded is voice information received by a general telephone line or the like. It is preferable to use a linear predictive coding, which is a high-efficiency coding method that requires a small amount of data that has been converted, that is, a method of modeling a human vocalization mechanism and parameterizing and coding. LPC, CELP, V-CELP, MELP and the like are exemplified.

When the sound wave band of music information or the like exceeds 4 KHz of voice as data to be coded, decoding is performed by the above-described coding method such as linear predictive coding.
It is preferable to use the waveform coding method because the sound quality when reproduced is remarkably deteriorated and the reproduction becomes practically impossible. This waveform encoding method is PCM, ADPC
M, ADM, etc. are exemplified.

In the present embodiment, 4.8 Kbps of CELP was used as the linear predictive coding system related to voice, and 32 Kbps of the ADM system was used for waveform coding related to music.

The mode of use of this pager will be described with reference to the flow charts of FIGS. 1 to 3. First, the transmitted radio wave is received by the antenna 2 in the pager, demodulated by the RF circuit 3 and converted into digital data. It The converted digital data is compared with the pager address data registered in the memory 16 while the address data in the data is extracted by the comparator 4. When the address data and the pager address signal of the received data match, the comparator 4 sends a signal indicating that the address data signals match to the control unit 6. The control unit 6 receives the signal by the address data signal coincidence of the comparator 4,
The coded signal and voice data or music data sent subsequently to the pager address signal are fetched as digital data of a predetermined bit length, stored in the memory bank 5, and the signal tone of the message reception is transmitted by the voice means 15. Then, the owner is informed that the message has been received, and the memory bank storing the received message data is displayed on the display device 7.

The pager holder can confirm the arrival of a message by the signal sound of the message reception, and if necessary, selects the memory bank storing the received message with the selection switch 8 and then activates the reproduction switch 9. Let

In response to this, the control unit 6 causes the digital signal processor (hereinafter abbreviated as DSP) 13 to call the CELP encoding processing algorithm 32, which is an encoding method for audio reproduction, from the dedicated ROM memory 14. Read the standard voice message "Enter password after dial tone" encoded by CELP stored in the dedicated ROM memory 14 and decrypt it to perform A / D / D / A conversion. After being sent to the circuit 10 and converted into an analog signal here, this is amplified by the amplifier circuit 11 and output from the speaker 12. Next, the control unit 6 controls the A / D / D / A
The conversion circuit 10 is switched to A / D conversion, and the DSP
Then, the encoded data of the voice password of the owner himself who has already been registered is called from the dedicated ROM memory 14, and at the stage when this calling is completed, the speaker 12 outputs the tone indicating that the input preparation is completed.

The owner of the pager who has heard the above-mentioned voice output utters the already registered password to the speaker 12 following the dial tone. The control unit 6 controls the A / D, D / A
A / D conversion is performed by the conversion circuit 10, and this data is CE processed by DSP.
After the encoding process in LP is performed to obtain encoded data, the encoded data 34 of the input voice password and the encoded data of the voice password of the owner himself read from the dedicated ROM memory 14 are compared. Then, the voice recognition processing algorithm 33 that determines the degree of matching of various parameters in both encoded data is executed, and it is determined whether or not the input voice password belongs to the owner. If it is determined that the owner is not the owner,
The voice reproduction process is performed only when the result that the voice password belongs to the owner himself is obtained without performing the message reproduction.

The control unit 6 receives the output that the judgment result is the owner himself, and reads the encoded signal data and the transmitted message data from the memory bank selected by the selection switch 8. The control unit 6 causes the DSP 13 to read the encoding method to be used for decoding from the read encoded signal data of the memory bank from the dedicated ROM memory 14.

In this case, the control unit 6 uses an algorithm suitable for decoding and reproducing the encoded signal in the data,
That is, in the case of human voice received through a general telephone line or the like, an encoding processing algorithm 32 as a linear predictive encoding method is used.
In the case of music-related sound information, the waveform coding algorithm 31 is selectively read from the dedicated ROM memory 14 into the DSP 13. Subsequently, the control unit 6 switches the A / D / D / A conversion circuit 10 to D / A conversion, and then sends the message data read from the memory bank to the DSP 13, where the selected encoding is performed. After decrypting it using the algorithm,
The D / A conversion circuit 10 performs D / A conversion, the amplification circuit 11 amplifies and outputs from the speaker 12.

The encoding system used in this embodiment uses CELP 4.8 Kbps as the speech-related linear predictive encoding system, and the ADM system 32 Kbps for the music-related waveform encoding. Moreover, the present invention is not limited to these encoding methods. As the DSP used in the present invention, a plurality of processing algorithms can be read from the ROM for execution, and it is preferable that the operation speed be high, so that it is used in this embodiment, for example 32 Bit floating point DSP "TMS320C31"
(Texas Instruments Co., Ltd. product name) is exemplified, but although the processing speed becomes slow, use of a fixed-point DSP is preferable for a portable device such as the pager of the present invention when it is desired to reduce power consumption. The selection may be made appropriately from the viewpoint of design such as battery capacity. For pattern matching in the voice recognition processing algorithm, it is preferable to use a comparatively low calculation load such as a pseudo DTW (Dynamic Time Warping) method that can be processed by a fixed-point DSP because the recognition processing time can be shortened. It is not something that will be done.

[0027]

According to the above invention, the following effects can be obtained.

According to the first aspect of the present invention, it is possible to appropriately select and transmit the message data processed by a plurality of encoding methods in accordance with the sound wave band, and therefore the encoded data capacity. Can be suppressed to the minimum size, and as a result, it becomes possible to shorten the time required to transmit a message when the transmission rates are the same. Specifically, for example, when linear predictive coding is used from the viewpoint of reducing the time required for transmission, there is no problem in transmitting voice information, but the original sound could not be reproduced even if music information was transmitted. On the other hand, according to the present invention, when the music information is desired to be transmitted, it is possible to obtain the convenience that the music information can be transmitted and reproduced by selecting the encoding method suitable for the music information.

According to the third aspect of the invention, when transmitting sound, securing confidentiality is an important issue from the viewpoint of privacy protection, and when trying to add a confidentiality function by voice recognition, Although a dedicated circuit or LSI for voice recognition is required, according to the present invention, the voice recognition algorithm and the coded data of the voice password are stored in the memory storing the coding processing algorithm for reproducing the sound data. However, since a DSP that mainly performs sound reproduction processing can also be used for this voice recognition, it is possible to provide a pager that can realize high confidentiality at low cost.

[0030]

[Brief description of drawings]

FIG. 1 is a block diagram of a voice pager of the present invention.

FIG. 2 is a flow diagram when a voice pager is used.

FIG. 3 is a block diagram of a voice converting means portion of FIG.

[Explanation of symbols]

 1 receiving means 2 antenna 3 RF circuit 4 comparator 5 memory bank 6 control unit 7 display device 8 selection switch 9 playback switch 10 A / D / D / A conversion circuit 11 amplification circuit 12 speaker 13 digital signal processor 14 dedicated ROM memory 15 Speech means 16 Memory 31 Waveform encoding algorithm 32 Encoding algorithm 33 Speech recognition algorithm 34 Encoded data

Claims (3)

[Claims] 1. A receiving means for receiving a radio wave obtained by digitally modulating encoded message data, a data memory means for storing the received data, and a switch operation for decoding the received data in the data memory, D / In a voice pager provided with a voice converting means for converting A into voice, the voice converting means stores a memory storing at least two encoding processing algorithms, and a specific encoding processing algorithm from the memory. And a digital signal processor (DSP) for reading and decoding specific received data, and at least two different coded message data in one DSP
A voice pager characterized in that it can be encoded and played back in. 2. A data transmission method in which a radio wave obtained by digitally modulating encoded message data is transmitted to a voice pager, wherein the message data to be transmitted has individual address data and a signal of the processing method used for the encoding processing. When the message data to be sent is voice information, the message data coded by the linear predictive coding method is used, and when the message data to be sent is music information, the waveform coding method is used. A data transmission method in a central control station, characterized in that encoded message data is selected and transmitted. 3. A receiving means for receiving radio waves obtained by digitally modulating encoded message data, a data memory means for storing the received data, and a switch operation for decoding the received data in the data memory, D / A voice conversion means for converting A into voice is provided, wherein the voice means reads at least one coding processing algorithm and a specific coding processing algorithm from the memory, In a voice pager comprising a digital signal processor (DSP) for decoding received data, the memory further stores a voice recognition algorithm and encoded data of a voice password, and the encoding process stored in the memory Algorithm, voice recognition algorithm, and encoded data of voice password Digital Signal Processor (DS
The voice pager is characterized in that it is read into P) as needed and voice recognition processing can be performed by the DSP.