JPH11331797A - Ca module, digital broadcasting receiver and digital broadcasting receiving system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To share a CA module to be used for deciphering in digital broadcasting with plural digital broadcasting receivers. SOLUTION: Each of digital broadcasting receivers 40, 41 and a CA module 250 is provided with an IEEE1394 inteface. The receivers 40, 41 respectively transfer an ECM and an EMM outputted from respective TS separators to the CA module 250 via an IEEE1394 bus. The module 250 inputs the transferred ECM and EMM to an IC card 110, deciphers the ciphers of the ECM and EMM and transfers obtained scramble keys to respective receivers 40, 41 to be ECM and EMM transmitting sources through the IEEE1394 bus. Each digital broadcasting receiver inputs via received scramble key to a descrambler for deciphering the cipher of the broadcasting signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast receiver using a wireless or wired transmission path, and more particularly to a digital broadcast receiver which has been encrypted for the purpose of providing pay broadcasts only to subscribers. .

[0002]

2. Description of the Related Art Digital broadcasting by a communication satellite (CS), whose service was started in 1996, has gained hundreds of thousands of subscribers in less than one year, and is now in a popular stage. In cable television, a standard for providing digital broadcasting services has already been determined. further,
In terrestrial television broadcasting and satellite broadcasting by a broadcasting satellite (BS), standardization work of digital broadcasting is currently being vigorously pursued, and services are scheduled to start around 2000.

[0003] Among these broadcasting services, the prior art will be described by taking, as an example, CS digital broadcasting in which the service has already been started. FIG. 1 is a diagram illustrating a basic device configuration for receiving a CS digital broadcast. A radio signal in the 12.5 GHz band transmitted from the communication satellite is received by the parabolic antenna 10. The received radio signal is frequency-converted by the converter 20 into an IF signal in the 1 GHz band, and is input to the digital broadcast receiver 40 via the coaxial cable 30. The digital broadcast receiver 40 selectively decodes a signal corresponding to a desired broadcast program from the received IF signal, and converts the signal into an analog video signal and an analog audio signal. These analog signals are transmitted to the TV monitor 5
By inputting 0, a desired broadcast program can be viewed.

In this CS digital broadcasting, MPEG2 (Moving) is used as a compression encoding method for video signals and audio signals.
Picture Experts Group 2) Standard is applied. The video signal and the audio signal are compression-encoded independently of each other. A method of multiplexing the plurality of compression-encoding signals into one stream is based on ISO / IEC13.
818-1 (MPEG2 Systems standard).
The following TS) is applied. Here, this TS will be briefly described.

[0005] TS is a stream format defined for multiplexing one or more programs composed of video / audio signals and other data signals compression-encoded according to the MPEG2 standard. In the TS, each component to be multiplexed is stored in a payload portion of a 188-byte fixed-length packet called a transport packet (hereinafter, TS packet), and the TS packet is packet-multiplexed to multiplex one or more programs. Is realized.
Each TS packet has, in its header part, one called PID.
It has a 3-bit field and is distinguished from each other by this value.

[0006] In the TS, a method for selectively separating TS packets of video and audio signals constituting a desired program from a multiplexed stream is also specified. This separation is P
This is realized by using various selection control information called SI (Program Specific Information). PSI
Are multiplexed into a multiplexed stream together with the program components in the form of TS packets. In the CS digital broadcasting described above, about 30 radio signals per radio carrier signal are transmitted.
It has a transmission capacity of Mbps, and can multiplex PSI and video programs of about 4 to 8 programs by TS to transmit. Furthermore, since about 10 to 20 radio carrier signals are multiplexed and transmitted by frequency multiplexing and polarization multiplexing, about 100 programs can be provided as a whole.

[0007] In CS digital broadcasting, most programs are provided as pay broadcasts, and a conditional access system is applied so that only those who have contracted can view the programs. For a description of this conditional access system, see Hashimoto's reference, "Technology and Trends in Digital Satellite Broadcasting" (IEICE Vol.81 No.1
pp.86-88 Jan. 1998), but will be briefly described here.

[0008] Video and audio TS packets of a pay broadcast program are transmitted after being encrypted with a scramble key (Ks). Ks is E which is packetized and broadcasted in TS.
It is described in a CM (Entitlement Control Message). The ECM is common information defined for each broadcast channel, and is broadcast after being encrypted by a work key (Kw). Further, Kw is described in an EMM (Entitlement Management Message) that is formed into a TS packet and broadcast. The EMM is individual information that differs for each viewer. In addition to Kw, information on a program subscribed to by the viewer is described. This EMM is broadcast after being encrypted by the master key (Km).

The circuit for decrypting EMM by using Km and Km and the circuit for decrypting ECM by using Kw are all included in one IC card.
By attaching the card to a digital broadcast receiver, viewing of pay digital broadcasts becomes possible. This IC card is generally called a CA module, and its shape and specifications such as an electrical interface are described in "CS Digital Broadcasting Receiver" by the Association of Radio Industries and Businesses.
Standards ”(ARIB STD-B1, version 1.1, January 1998).

Based on the above description, the basic configuration of the digital broadcast receiver 40 in the prior art shown in FIG. 1 will be described with reference to FIG.

The IF transmitted through the coaxial cable 30 in FIG.
The signal is transmitted to the QPSK demodulator 60 of the digital broadcast receiver 40.
Is input to The QPSK 60 selects and demodulates one desired wave from a plurality of frequency-multiplexed carrier signals. The demodulated output is subjected to error correction, interleaving, and energy spreading decoding in error correction 70. These encoding methods are described in "C
S Digital Broadcasting Receiver Standard "(ARIB S
TD-B1, version 1.1, January 1998). The TS output from the error correction 70 is input to a TS separator 90 via a descrambler 80 described later.

The TS separator 90 separates video packets, audio packets, PSI, ECM, EMM, and the like from the input TS. Of these, video and audio packets are
The signal is decoded by the AV decoder 100 and converted into an analog signal. The PSI, ECM, and EMM are stored in the memory 130, and are used for program selection control and conditional access control using the CPU 120.

[0013] The IC card 110 for conditional access is inserted into the digital broadcast receiver 40 and connected to the bus 140. The ECM and EMM separated by the TS separation 90 and stored in the memory 130 are input to the IC card 110 via the bus 140. The IC card 110 calculates and outputs a scramble key Ks based on the input ECM and EMM. By inputting Ks to the descrambler 80 via the bus 140, decryption processing is performed on video and audio packets of a desired program.

The digital broadcast receiver 40 includes a modem for accessing a broadcast center via a telephone line and a high-speed digital interface for outputting a data broadcast signal to the outside of the device without passing through the TS separator 90, as shown in FIG. Generally have functional blocks not shown.

[0015]

In the digital broadcasting receiver according to the prior art described above, the interface of the CA module for decryption is closed inside the device. Only decryption is performed. Therefore, when a digital broadcast receiver is installed in a plurality of rooms in a home and different pay broadcast programs are viewed in each room, it is necessary to separately attach a CA module to each digital broadcast receiver. . The current viewing contract takes a form in which a contract is made for each CA module ID number. Therefore, when there is a possibility that one broadcast channel can be viewed in a plurality of rooms using different digital broadcast receivers, it is unreasonable that a plurality of viewing contracts must be made for the broadcast channel. Would.

An object of the present invention is to enable one CA module to be shared by a plurality of digital broadcast receivers in view of the above problems.

[0017]

According to the present invention, there is provided an external interface between a CA module and a bus of a digital broadcast receiver according to the prior art, which is capable of mutually transmitting and receiving information between a plurality of electronic devices. A plurality of digital broadcast receivers and a CA module are connected using an external interface, and the CA module is shared.

The external bus includes, for example, IEEE
A high-speed serial bus interface such as 1394 is applied.

The CA module of the present invention can be configured as a single unit, but can also be incorporated in a digital broadcast receiver. That is, the configuration of the digital broadcast receiver includes a configuration having only an external interface and no CA module, and a configuration having an external interface and a C
There is a form in which the A module can be mounted.

In the case of a digital broadcast receiver having an external interface and capable of mounting a CA module, means for controlling the external interface is provided so that other digital broadcast receivers can use the CA module. In the case of a digital broadcast receiver not equipped with a CA module, the digital broadcast receiver includes means for controlling an external interface so that another CA module can be used.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 3 is a diagram showing a first embodiment of the present invention. In the present embodiment, an example is shown in which a digital broadcast receiver and a CA module according to the present invention are applied to CS digital broadcasting.

The digital broadcast signal generated by transmitting station 150 is transmitted from transmitting antenna 230 to communication satellite 300 as broadcast radio wave 310. The broadcast radio wave 310 is frequency-converted by the communication satellite 300 and distributed to each viewer as a broadcast radio wave 311. Each viewer has the broadcast
11 is received using the parabolic antenna 10. In addition,
The broadcast waves 300 and 311 are multiplexed by both frequency multiplexing and polarization multiplexing.

In the transmitting station 150, video and audio broadcast materials 160 to 163 are converted into MPEG2 encoders 170 to 17.
3 and compression-coded by
183 scramble (encryption) for conditional access
Is made. Each of the scramblers 180 to 183 scrambles using the scramble key (Ks) supplied from the controller 190. This Ks is scrambled by the work key (Kw) and stored in the ECM. Kw is scrambled by the master key (Km) and stored in the EMM. These ECM and EM
M is input to the TS-MUXs 200 and 201 together with the main signal encrypted by the scramblers 180 to 183, and is multiplexed by the MPEG2 transport stream method. The digital streams output from the TS-MUXs 200 and 201 are QPSK modulators 210 and 211.
After being multiplexed by the multiplexer 220 and supplied to the transmission antenna 230.

On the other hand, at the viewer's house 240, a polarization switch 290 connected to the parabolic antenna 10, two digital broadcast receivers 40, 41, two television monitors 50,
51, the CA module 250 is connected as shown in the figure. Connection form of equipment at viewer's house, digital broadcast receivers 40 and 41 and CA module 2
FIG. 4 shows the details of the internal configuration of 50.

The parabolic antenna 10 is connected to two converters 20 and 21, which are a vertically polarized broadcast wave (hereinafter referred to as V wave) and a horizontally polarized broadcast wave (hereinafter referred to as H wave).
Waves) are received and frequency-converted. Polarization switch 29
Numeral 0 has a function of inputting the H wave and the V wave via the coaxial cables 30 and 31 and outputting only one of the broadcast waves requested by the digital broadcast receivers 40 and 41. Polarization switch 2
Numeral 90 realizes this switching by a DC voltage value. For example, if the digital broadcasting receiver 40 outputs a DC voltage of 11 volts to the coaxial cable 32, the V-wave will
, And outputs an H wave if the DC voltage is 15 volts.

The digital broadcast receivers 40 and 41 have the same configuration, and include QPSK demodulators 60 and 61 and error corrections 70 and 7.
1, descramblers 80, 81, TS separation 90, 91,
AV decoders 100 and 101, CPUs 120 and 121,
Memory 130, 131, bus 140, 141, 1394
LINK IC260, 261, 1394 PHYI
C270 and 271 respectively. Hereinafter, the function of each unit will be described taking the digital broadcast receiver 40 as an example.

The QPSK demodulator 60 selects and demodulates one desired wave from a plurality of frequency-multiplexed carrier signals. In the error correction 70, the demodulated output is subjected to error correction, interleaving, and energy spreading decoding. The TS output from the error correction 70 is input to a TS separator 90 via a descrambler 80 that performs decryption. TS separation 9
0 separates video packets, audio packets, PSI, ECM, EMM, etc. from the input TS. Of these, video and audio packets are decoded by the AV decoder 100 and converted to analog signals. PSI, E
The CM and EMM are stored in the memory 130, and the CPU 120
It is used for program selection control and conditional access control using.

The 1394 LINK IC 260 is an IE
An IC that serves as a link layer of the EE1394 bus, and performs cycle control and packet transmission / reception. 1394 PHY I
C270 is an IC that plays the physical layer of the IEEE 1394 bus
Performs encoding / decoding of a signal, arbitration of a bus, and a physical interface with a transmission medium. In this embodiment, a PHY having a transmission rate of 100 Mbit / s
IC is used.

The CA module 250 has a 1394 PH
Y IC 272, 1394 LINK IC 262, bus 142, memory 132, CPU 122, IC card 1
It consists of ten. The functions of the 1394 PHY IC 272 and the 1394 LINK IC 262 are equivalent to those used in the digital broadcast receivers 40 and 41. The CPU 122 and the memory 132 are used for controlling the IC card 110 and the 1394 bus and for storing data.

The digital broadcast receivers 40 and 41 and the CA module 250 are connected to each other in a daisy chain format using 1394 cables 280 and 281 as shown in FIG. In this embodiment, the digital broadcast receiver 40 is the root, and the node IDs are 0 for the CA module 250, 1 for the digital broadcast receiver 41, and 2 for the digital broadcast receiver 40, respectively.

The IEEE 1394 bus in the present embodiment uses ECM, EMM, and K for decrypting broadcast signals.
Used for transmission of s. That is, the ECM and EMM separated from the broadcast wave are transferred from the digital broadcast receiver to the CA module 250, and Ks output from the IC card 110 in the CA module 250 is transferred to the digital broadcast receivers 40 and 41. I do. The transfer of these data is performed by the asynchronous transfer specified in IEEE1394.

FIG. 5 shows the IEEE1394 of the present embodiment.
2 shows an example of data transfer on a bus. It is sufficient that the transfer of the EMM in which the scrambled Kw is stored is performed from only one digital broadcast receiver. In the present embodiment, the digital broadcast receiver 41 with the youngest node ID performs this transfer. On the other hand, the transfer of the ECM and the transfer of Ks as its response must be performed by all digital broadcast receivers. Therefore, for ECM,
All digital broadcast receivers transmit asynchronous packets to which ECM is mapped in a time-division multiplexed manner.

FIG. 6 is a diagram showing a second embodiment according to the present invention. In the present embodiment, an example is shown in which the digital broadcast receiver according to the present invention is applied to digital cable television broadcasting (CATV). A broadcast signal transmitted from the headend 370, which is a transmitting station, is distributed to each subscriber's home by a CATV transmission line network 380 composed of a coaxial cable. The equipment configuration in the head end 370 is the same as the transmission station 1 shown in FIG. 3 in the first embodiment.
It is almost the same as the equipment configuration of 50. However, since the modulation scheme is different from that of digital broadcasting by a communication satellite, QAM modulators 320 and 321 are used in head end 370. In the present embodiment, a 64QAM modulation scheme is applied.

At the viewer's home 240, two digital broadcast receivers 40 and 41, a distributor 330 for distributing broadcast signals to these two digital broadcast receivers, a decoder 340,
Two television monitors 50 and 51 are connected as shown in the figure. The connection form of the device at the viewer's home,
Digital broadcast receivers 40 and 41 and decoder 340
FIG. 7 shows the details of the internal configuration of FIG.

The digital broadcast receiver 40 includes the digital broadcast receiver 40 and the CA module 250 shown in FIG. 4 in a single case, except that a QAM demodulator 350 is mounted instead of the QPSK demodulator. It has the same configuration as that described above. The receiver 4 via the coaxial cable 32
In order to decrypt the broadcast signal input to the device 0, the EC is transmitted via an IEEE 1394 bus connected inside the device.
Transfer of M and Ks is performed.

On the other hand, since the digital broadcast receiver 41 does not include a CA module in itself,
Decryption is performed by accessing the IC card 110 in the digital broadcast receiver 40 via the 394 bus.
Further, the digital broadcast receiver 41 does not have an AV decoder in itself, and MPEG2 decoding is performed by the decoder 340. That is, the digital broadcast receiver 41
It has a function to transfer MPEG2 TS packets output from the TS separator 91 to the decoder 340 in real time in the IEEE1394 isochronous (isochronous) transfer format.

The method of transferring the MPEG2-TS packet in the isochronous format is described in IEC1883.
-1 and IEC 1883-4, this method is briefly described here.

First, a 4-byte source packet header having time information is added to a 188-byte TS packet to generate a 192-byte source packet. This source packet is divided into eight data blocks. Each data block is mapped to a data field of an isochronous packet after a common isochronous packet header (CIP header) is added.
In the present embodiment, the processes up to the point where the CIP header is added out of these processes are MPEG / 1394 IC360.
And mapping to isochronous packets is 13
94 LINKIC271.

At the decoder 340, an isochronous packet transferred from the digital broadcast receiver 41 via the 1394 cable 281 is received.
The TS packet is reproduced by the IC 361. This T
The S packet is separated into a video packet and an audio packet by the TS separation 92, and the AV decoder 101 performs a decoding process.

The digital broadcast receiver shown in FIG. 8 can be applied instead of the digital broadcast receiver 40 according to the present embodiment. IC card 110 is another IC
Connected to the same bus 140 as the CPU, memory, 13
Since only one set of the 94 LINK IC and the 1394 PHY IC is required, the size and cost of the device can be significantly reduced.

Further, instead of the digital broadcast receiver 41 of the present embodiment, a digital broadcast receiver shown in FIG. 9 can be applied. The digital broadcast receiver includes a switch 390 and the AV decoder 101. The switch 390 controls the path for guiding the output of the TS separation 91 to the AV decoder under the control of the CPU 121,
It is possible to select three paths: a path for guiding the output of the TS separation 91 to the IEEE 1394 interface, and a path for guiding the MPEG stream input from the IEEE 1394 interface to the AV decoder. That is, decoding and viewing a broadcast program by itself, decoding and viewing a broadcast program by a decoder 340, decoding and viewing an MPEG stream output from another device,
There are three uses.

FIG. 10 is a view showing a third embodiment of the present invention. In the present embodiment, the present invention is applied to a cable television system (optical CATV) using an optical fiber. The digital broadcast signal transmitted from the transmitting station 150 is distributed to the viewer's home through a passive optical fiber network including optical fibers 450 to 453 and an optical splitter 440. At the viewer's home 240, the distributed signal light is converted into an electric signal by the in-home optical terminal device, the desired broadcast program is decoded by the digital broadcast receivers 40 and 41, and the program is viewed using the TV monitors 50 and 51. I do.

In the present optical CATV, a retransmission service of CS digital broadcasting is provided using an optical fiber which is a wired medium. The transmitting station 150 distributes the radio signal received by the parabolic antenna 10 to the unit channel generators 410 to 412 via the distributor 331. In each unit channel generation device, the QPSK demodulators 60 to 64 demodulate radio carrier signals of different carrier frequencies and convert them to digital signals. Is entered. In the byte multiplexing circuit 400, a unit channel signal composed of a frame of 2430 bytes at a transmission rate of 155.52 megabits per second is generated, and each input signal is byte-by-byte in a payload portion of the frame. Multiplexed.

The plurality of unit channel signals generated in this manner are bit-multiplexed by the bit multiplexing circuit 420, converted into signal light by the optical line terminal 430, and transmitted to the optical fiber 450. Such a method of multiplexing digital broadcast signals is described in, for example, a document by Domon et al., “GTTH
(Gigabit To The Home) Study on Accommodation Method of Digital Satellite Broadcasting Signals ", 1997 IEICE General Conference, B-8-58.

FIG. 11 shows an internal configuration of the optical home terminal 460 and the digital broadcast receivers 40 and 41 and a device connection configuration in the viewer home 240. In-home optical termination unit 46
0 and the digital broadcast receivers 40 and 41 were connected by two-core optical fibers 451 and 452, respectively. The digital broadcast receivers 40 and 41 are connected to each other using a 1394 cable 280.

The in-home optical terminal unit 460 includes an optical receiving circuit 47
0, bit separation circuit 480, unit channel selection circuit 49
0, optical transceivers 500 and 501.
The optical receiving circuit 470 receives the signal light input via the optical fiber 450 and converts it into an electric signal. The bit separation circuit 480 separates the electric signal output from the optical reception circuit 470 into a unit channel signal of 155.52 megabits per second. The unit channel selection circuit 490 selectively outputs a unit channel signal required by the digital broadcast receiver 40 or 41 from a plurality of unit channel signals output by the bit separation circuit 480. Optical transceiver 500, 5
01 is a function of converting a unit channel signal output from the unit channel selection circuit 490 into an optical signal and transmitting the optical signal to the digital broadcast receiver, and receiving a control signal of the unit channel selection circuit transmitted from the digital broadcast receiver. With function.

Next, the digital broadcast receivers 40 and 41 will be described. Since both have exactly the same structure, the structure will be described using the digital broadcast receiver 40. The digital broadcast receiver includes an optical transceiver 502, a carrier selection circuit 510, a descrambler 80, a TS separation 90,
AV decoder 100, 1394 PHY IC270,
1394 LINK IC 260, CPU 120, memory 130, and card slot 520. The card slot 520 has an IC card 1 for conditional access.
10 can be mounted. Optical transceiver 502
Has a function of receiving a unit channel signal transmitted from the optical network unit 460 and a function of transmitting a control signal of the unit channel selection circuit 490 in the optical network unit 460. The carrier selection circuit 510 is connected to the optical transceiver 50.
2 has a function of selecting and outputting a digital signal corresponding to one radio carrier of CS digital broadcasting from the unit channel signals output from the unit 2. IEEE139 comprising 1394 LINK IC260 and 1394 PHY IC270
4 interfaces are ECM and EMM for release limitation
And Ks are transmitted and received.

The digital broadcast receivers 40 and 41 have a function of detecting whether or not an IC card is inserted in the card slot by detecting the electrical state of the IC card interface in the card slot. This I
The mounted state of the C card is written in the memory. FIG.
In the case of, the fact that a card is mounted is written in the digital broadcast receiver 40, and the fact that a card is not mounted is written in the digital broadcast receiver 41.

The digital broadcast receiver 40 equipped with the IC card 110 receives the ECM output from the TS separation 90.
Is directly input to the IC card 110 to obtain Ks.

On the other hand, in the case of the digital broadcast receiver 41 without an IC card, the device with the IC card is searched for via the IEEE1394 network. Here, it is detected that the IC card 110 is attached to the digital broadcast receiver 40. Therefore, the digital broadcast receiver 41 converts the ECM output from the TS separation 91 into 13
The signal is transmitted to the digital broadcast receiver 40 via the 94 cable 280. In the digital broadcast receiver 40, the received E
The CM is input to the IC card 110, and the returned Ks is sent back to the digital broadcast receiver 41. With such an operation, the digital broadcast receiver 41 to which the IC card is not attached can view the pay-scrambled broadcast. Note that the IC card 110 may be detached from the digital broadcast receiver 40 and attached to the digital broadcast receiver 41. In this case, the operations of both digital broadcast receivers described above are completely opposite.

[0052]

As described in detail above, according to the present invention, CA used for decryption in digital broadcasting is used.
The module can be shared by a plurality of digital broadcast receivers.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic device configuration for receiving a digital broadcast using a communication satellite.

FIG. 2 is a diagram illustrating an internal configuration of a digital broadcast receiver according to the related art.

FIG. 3 is a diagram showing a first embodiment of the present invention.

FIG. 4 shows digital broadcast receivers 40 and 41 and a CA module 250 used in the first embodiment of the present invention.
FIG. 3 is a diagram showing an internal configuration of the device and their connection forms.

FIG. 5 shows an IEEE1394 according to the first embodiment of the present invention.
FIG. 3 is a diagram illustrating a form of data transfer on a bus.

FIG. 6 is a diagram showing a second embodiment of the present invention.

FIG. 7 is a diagram showing the internal configurations of digital broadcast receivers 40 and 41 and a decoder 340 used in the second embodiment of the present invention and their connection forms.

FIG. 8 is a diagram illustrating a configuration of another applicable digital broadcast receiver according to the second embodiment of the present invention.

FIG. 9 is a diagram illustrating a configuration of still another applicable digital broadcast receiver in the second embodiment of the present invention.

FIG. 10 is a diagram showing a third embodiment of the present invention.

FIG. 11 shows an optical network unit 460 and digital broadcast receivers 40 and 4 used in the third embodiment of the present invention.
FIG. 2 is a diagram showing an internal configuration of the first embodiment and their connection forms.

[Explanation of symbols]

10: Parabolic antenna 20, 21: Converter 30, 31, 32, 33: Coaxial cable 40, 41, 42: Digital broadcast receiver 50, 51: TV monitor 60, 61, 62, 63, 64: QPSK demodulator 70, 71, 72, 73, 74: error correction 80, 81: descrambler 90, 91, 92: TS separation 100, 101: AV decoder 110: IC card 120, 121, 122, 123: CPU 130, 131, 132, 133 : Memory 140, 141, 142, 143: bus 150: transmitting station 160, 161, 162, 163: broadcast material 170, 171, 172, 173: MPEG2 encoder 180, 181, 182, 183: scrambler 190: controller 200, 201: TS MUX 210, 211: QPSK Modulator 220: multiplexer 230: transmission antenna 240: viewer's home 250: CA modules 260,261,262,263: 1394 LINK
IC 270, 271, 272, 273: 1394 PHY
IC 280, 281: 1394 cable 290: Polarization switch 300: Communication satellite 320, 321: QAM modulator 330, 331: Distributor 340: Decoder 350, 351: QAM demodulator 360, 361: MPEG / 1394 IC 370: Headend 380: CATV transmission line network 390: Switch 400: Byte multiplexing circuit 410, 411, 412: Unit channel generating device 420: Bit multiplexing circuit 430: Local optical terminal 440: Optical splitter 450, 451, 452, 453: Optical Fiber 460: home optical terminal unit 470: optical receiving circuit 480: bit separation circuit 490: unit channel selection circuit 500, 501, 502, 503: optical transceiver 510, 511: carrier selection circuit 520, 521: card slot

Claims (18)

[Claims] 1. A CA module used to obtain key data for decrypting a digitalized and encrypted broadcast service signal for each broadcast channel, wherein the key data is encrypted. Key operation means for inputting the encrypted key data and outputting the key data,
An external interface capable of transmitting and receiving information between each of the plurality of other electronic devices, and receiving the encryption key data transmitted by the other electronic device via the external interface, A CA module which inputs the key data to the key calculation means and transmits the key data output from the key calculation means to the other electronic device which is the transmission source of the encrypted key data via the external interface. 2. The CA module according to claim 1, wherein said external interface is a serial bus interface. 3. The method according to claim 2, wherein the serial bus interface is an IE.
3. The CA module according to claim 2, wherein the CA module is based on the EE1394 standard. 4. MPEG2 (Moving Picture Experts G)
roup2) In a digital broadcast receiver for processing a unit broadcast signal composed of at least one multiplexed one or more encrypted broadcast service signals and encryption key data based on a transport stream method defined in the standard, Decryption means for decrypting a desired encrypted broadcast service signal multiplexed into a unit broadcast signal by inputting key data and converting the decrypted broadcast service signal into a broadcast service signal; and outputting key data from the output signal of the decryption means. Separating means for separating and outputting the encrypted encryption key data and the broadcast service signal, an external interface capable of transmitting and receiving information to and from another electronic device, and Key calculation means mounting unit for mounting key calculation means for inputting the encrypted encryption key data and outputting the key data,
A key calculating means mounting detecting section for detecting whether or not the key calculating means is mounted on the key calculating means mounting section, wherein the key calculating means is mounted on the key calculating means mounting section by the key calculating means mounting detecting section. When it is detected that the electronic device is not attached to the electronic device, the received encryption key data is transmitted to the key operation unit of another electronic device via the external interface, and the other electronic device Receiving the key data output by the key operation means having the same via the external interface, inputting the received key data to the decryption means to decrypt the encrypted broadcast service signal, If the means for attachment detection detects that the key calculation means is mounted on the key calculation means mounting section, the encrypted key data is mounted on the key calculation means mounting section. An operation of transmitting the key data output from the key operation unit to the key operation unit and inputting the key data to the decryption unit to decrypt the encrypted broadcast service signal; The encryption key data input via the interface is input to the key calculation means mounted on the key calculation means mounting section, and the key data output by the key calculation means is transmitted to another key processing via the external interface. A digital broadcast receiver that performs both an operation of transmitting to an electronic device. 5. MPEG2 (Moving Picture Experts G)
roup2) In a digital broadcast receiver for processing a unit broadcast signal composed of at least one multiplexed one or more encrypted broadcast service signals and encryption key data based on a transport stream method defined in the standard, Decryption means for decrypting a desired encrypted broadcast service signal multiplexed into a unit broadcast signal by inputting key data and converting the decrypted broadcast service signal into a broadcast service signal; and outputting key data from the output signal of the decryption means. A separating means for separating and outputting the encrypted encryption key data and the broadcast service signal respectively, and an external interface capable of transmitting and receiving information with another electronic device, A key function for inputting the encryption key data of another electronic device via the external interface and outputting the key data; The key data output by the key calculation means of the other electronic device is transmitted through the external interface.
A digital broadcast receiver, wherein the received key data is input to the decryption means to decrypt the encrypted broadcast service signal. 6. An MPEG2 (Moving Picture Experts G)
roup2) In a digital broadcast receiver for processing a unit broadcast signal composed of at least one multiplexed one or more encrypted broadcast service signals and encryption key data based on a transport stream method defined in the standard, Decryption means for decrypting a desired encrypted broadcast service signal multiplexed into a unit broadcast signal by inputting key data and converting the decrypted broadcast service signal into a broadcast service signal; and outputting key data from the output signal of the decryption means. Separating means for separating and outputting the encrypted encryption key data and the broadcast service signal, an external interface capable of transmitting and receiving information to and from another electronic device, and Key operation means for inputting the encrypted encryption key data and outputting the key data, and transmitting the received encryption key data to the key operation means. Inputting the key data output by the key operation means to the decryption means to decrypt the encrypted broadcast service signal; and inputting the key data transmitted from another electronic device via the external interface. The encrypted encryption key data is input to the key calculation unit mounted on the key calculation unit mounting unit, and the key data output by the key calculation unit is directed to the other electronic device via the external interface. A digital broadcast receiver that performs both of the operation of transmitting a digital broadcast. 7. The apparatus according to claim 4, further comprising decoding means for decoding the broadcast service signal separated and output from the separation means and outputting an analog video signal or an analog audio signal or both. 7. The digital broadcast receiver according to items 6 to 6. 8. The digital broadcast receiver according to claim 4, wherein the broadcast service signal output from the separation unit is output to the outside via the external interface. 9. A switch inserted between the separating means and the decoding means, wherein the switch converts the broadcast service signal output from the separating means between the decoding means and the external interface. A function of selecting which to output, and a function of the decoding means selecting which of the broadcast service signal output from the separation means and the broadcast service signal input from the external interface. 8. The digital broadcast receiver according to claim 7, which has both functions of: 10. The digital broadcast receiver, wherein a carrier signal is generated by digitally modulating the unit broadcast signal, and one or more carrier signals having different carrier frequencies are frequency-multiplexed, polarization-multiplexed, or frequency-multiplexed. The receiver according to any one of claims 4 to 9, wherein the receiver is configured to receive a multiplexed broadcast signal multiplexed by both the signal and the polarization multiplexing via a wired or wireless transmission path. Digital broadcast receiver. 11. The digital broadcast receiver operates at a rate of 15 per second.
The unit broadcast signal is byte-multiplexed into a payload portion of a 2430-byte unit frame having a speed of 5.52 Mbits to generate a first unit channel signal, and one or more of the first unit channel signals are transmitted at 155 per second. 5. A receiver for receiving, via a wired or wireless transmission path, a multiplexed broadcast signal bit-multiplexed with one or more second unit channel signals having a speed of .52 Mbits. A digital broadcast receiver according to any one of claims 1 to 9. 12. The digital broadcast receiver according to claim 10, further comprising a selection unit that selects and outputs a desired unit broadcast signal from the received multiplexed broadcast signal. 13. The digital broadcast receiver according to claim 4, wherein said external interface is a serial bus interface. 14. The serial bus interface according to claim 1, wherein
Characterized by being based on the EEE1394 standard,
The digital broadcast receiver according to claim 13. 15. Decryption means for decrypting a desired encrypted broadcast service signal multiplexed on an input unit broadcast signal by inputting key data and converting it into a broadcast service signal, and said decryption means. Separating means for separating and outputting encryption key data and a broadcast service signal in which key data is encrypted from an output signal of the means, and an external interface capable of transmitting and receiving information between other electronic devices And MPEG2 (Moving Picture Experts Group)
2) a plurality of digital broadcast receivers for processing a unit broadcast signal configured by multiplexing at least one or more encrypted broadcast service signals and encryption key data based on a transport stream method defined in a standard; Key operation means for inputting the encrypted key data in which the key data is encrypted and outputting the key data, and an external interface capable of transmitting and receiving information between each of the plurality of digital broadcast receivers; The CA module receives the encrypted key data transmitted from the plurality of digital broadcast receivers via the external interface, inputs the encrypted key data to the key calculation means, and The key data output by the arithmetic means is transmitted to the digital broadcast receiver, which is the transmission source of the encryption key data, via the external interface. Each of the digital broadcast receivers transmits the received encryption key data to the CA module via the external interface, and outputs the key data addressed to each digital broadcast receiver, which is output by the key calculation means of the CA module. A digital broadcast receiving system, which receives the data via the external interface, inputs the received key data to the decryption means, and decrypts the encrypted broadcast service signal. 16. Decryption means for decrypting a desired encrypted broadcast service signal multiplexed on an input unit broadcast signal by inputting key data and converting it into a broadcast service signal, and said decryption means. Separating means for separating and outputting encryption key data and a broadcast service signal in which key data is encrypted from an output signal of the means, and an external interface capable of transmitting and receiving information between other electronic devices And MPEG2 (Moving Picture Experts Group)
2) A plurality of digital broadcast receivers for processing a unit broadcast signal composed of at least one multiplexed one or more encrypted broadcast service signals and encryption key data based on a transport stream system defined in the standard. One or more receivers among the plurality of digital broadcast receivers include key operation means for inputting encrypted key data in which key data is encrypted and outputting the key data; Transmitting the encrypted key data to the key operation means, inputting the key data output from the key operation means to the decryption means to decrypt the encrypted broadcast service signal, and receiving another digital broadcast. The encryption key data transmitted from the device and input via the external interface is input to the key operation means, and the key data output from the key operation means is transmitted to the external input device. Performing an operation of transmitting to the other digital broadcast receiver via the external interface, the other receiver that does not include the key operation unit transmits the received encryption key data to the key via the external interface. Transmitting to a digital receiver equipped with arithmetic means,
Receiving, via the external interface, key data addressed to the receiver output from the key operation means of the receiver, and inputting the received key data to the decryption means to encrypt the encrypted broadcast service signal; A digital broadcast receiving system, which is canceled. 17. The digital broadcast receiving system according to claim 15, wherein said external interface is a serial bus interface. 18. The serial bus interface according to claim 1, wherein
The digital broadcast receiving system according to claim 17, wherein the digital broadcast receiving system is based on the EEE1394 standard.