JP2008098970A - Digital broadcast receiving system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a conventional digital broadcast receiver requires a CAS card for each decoder in order to exchange a key with the CAS card in a descrambling section in each decoder in descrambling. <P>SOLUTION: In the system, a descrambler section is moved from decoder devices 2, 3 to a tuner 1, and TS separating sections 41, 44 extract necessary programs in re-multiplexing sections 17, 18 with a descrambling function, descrambling sections 42, 45 descramble for the programs, and TS multiplexing sections 43, 46 multiplex the programs after descrambling, thereby optimizing the descrambling processing to be executed per program. Further, the system has a configuration in which a single CAS card 22 is shared via a CAS control section 21 in descrambling by the two descrambler sections 17, 18 so that the single CAS card 22 can deal with a plurality of decoders 2, 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiving system that simultaneously receives broadcasts of a plurality of channels, decodes a plurality of programs at the same time, and can be extended over a network.

  The digital broadcast receiving system is a system that receives an encrypted (scrambled) program so that only a specific viewer can view it. In the same system, information about program information and availability is added to the program to be distributed. The information on the program and the information on the control of the receiver are collectively referred to as common information (hereinafter referred to as ECM). The individual contract information based on a unique number for each subscriber given to the CAS card in the receiver and the information for decrypting the ECM are collectively referred to as individual information (hereinafter referred to as EMM). Using the ECM and EMM, the user can scramble the scrambled program on the receiver side using the CAS card and watch the broadcast.

  Hereinafter, a conventional digital reception system that simultaneously receives broadcasts of a plurality of channels, decodes a plurality of programs at the same time, and can be extended over a network will be described with reference to FIG.

  FIG. 3 is a diagram showing the configuration of a conventional digital broadcast receiving system. The example of FIG. 3 shows a digital broadcast receiving system with n = 3 and m = 2. Here, n is an integer of 2 or more indicating the number of tuners, and m is an integer of 1 or more indicating the number of decoder devices. Specifically, the digital broadcast receiving system includes a tuner device 4 incorporating three tuners and two decoder devices 5 and 6.

  In FIG. 3, the tuner device 4 includes three tuner units 11, 12, 13, three digital demodulation units 14, 15, 16, two stream remultiplexing units 23, 24, and a stream transmission unit 19. The decoder device 5 includes a stream receiving unit 27, a descrambler unit 28, a stream processing unit 29 with accumulation control, an AV decoder unit 30, and a storage unit 31. The decoder device 6 includes a stream receiving unit 32, a descrambler unit 33, a stream processing unit 34, and an AV decoder unit 35.

  The operation of the digital broadcast receiving system configured as described above will be described below.

  First, the tuner device 4 will be described. The channel selection of the tuner units 11, 12 and 13 and the control of selecting and remultiplexing a plurality of programs of the stream remultiplexing units 23 and 24 are performed by the two external decoder devices 5 and 6 input via the stream transmission unit 19. Done according to the request. The tuner units 11, 12, and 13 select channels that match the band of each broadcast wave. The digital demodulation units 14, 15, and 16 perform digital demodulation and error correction processing according to a method that matches each broadcast wave, and output one transport stream from each broadcast wave.

  The stream remultiplexing unit 23 is in accordance with the request of the decoder device 5, and the stream remultiplexing unit 24 is in accordance with the request of the decoder device 6, and each of the three transport streams output from the digital demodulation units 14, 15, 16 is Two programs necessary for the devices 5 and 6 are selected and remultiplexed, and the remultiplexed transport streams are output to the stream transmission unit 19.

  The stream transmission unit 19 packetizes the two re-multiplexed transport streams, and transmits one transport stream to each of the decoder devices 5 and 6 according to a communication method such as IEEE1394 wired or IEEE802.11a wireless. .

  Next, the decoder device 5 will be described. The stream receiving unit 27 releases the packet of the received transport stream and outputs one transport stream to the descrambler unit 28. The descrambler unit 28 descrambles the transport stream and outputs it to the stream processing unit 29 with accumulation control. The stream processor with accumulation control 29 extracts two necessary programs as compressed video / audio data from the descrambled transport stream. The stream processing unit with accumulation control 29 time-shifts the extracted program while storing it in the storage unit 31, reads it again, and supplies it to the AV decoder unit 30. The AV decoder unit 30 combines the video / audio and outputs it to an external television or the like. Note that another extracted program is stored in the storage unit 31 and recorded on the back.

  Finally, the decoder device 6 will be described. The stream receiving unit 32 unpackets and outputs one transport stream to the descrambler unit 33. The descrambler unit 33 descrambles the transport stream and outputs it to the stream processing unit 34. The stream processing unit 34 extracts two necessary programs as compressed video / audio data from the descrambled transport stream. The AV decoder unit 30 combines the extracted video / audio of the two programs and outputs them to an external television on a split two-screen or picture-in-picture screen.

  Although not clearly shown in FIG. 3, descrambling in the descrambling units 28 and 33 of the decoder devices 5 and 6 is performed using a CAS control unit and a CAS card that exist in pairs with the descrambler units 28 and 33, respectively. Done.

JP 2003-163852 A

  As described above, in the conventional digital broadcast receiver, the key must be exchanged with the CAS card connected to the CAS card interface in the decoder device in order to descramble. Therefore, not only the first decoder device but also the second and subsequent decoder devices require a CAS card interface and a CAS card, and it is difficult to reduce the size of the decoder device. Furthermore, when the user has a CAS card that is additionally contracted with the first device, it is necessary to reinsert the first additional contract card into the second device when receiving the additional contracted program with the second device. There was a problem that it was not easy to use.

  In order to solve this problem, the present invention incorporates a descrambler function in a stream remultiplexing unit on the tuner device side, and a plurality of stream remultiplexing units share one CAS control unit and one CAS card. Means are provided so that a CAS card interface or CAS card on the decoder device side can be made unnecessary.

  In the digital broadcast receiving system of the present invention, since the decoder device side is CAS cardless, no CAS card slot is required, and the size can be reduced. In addition, since one CAS card on the tuner device side is shared, it is not necessary to insert and remove the CAS card, and a remarkable effect is obtained that the usability is improved.

The digital broadcast receiving system according to claim 1 of the present invention is
Built-in n tuners (n is an integer of 2 or more), receives and demodulates signals in different bands, selects and re-multiplexes from n streams generated only by the program requested by the decoder device described later A tuner device that reconfigures the stream into m (m is an integer of 1 or more) streams and transmits the m streams;
The tuner device is requested for a plurality of programs to be selected, one of the m streams transmitted from the tuner device is received, and the plurality of programs in the stream are simultaneously video / audio. Are provided with m decoder devices that perform decoding processing or record processing in the storage unit, and each tuner device has a plurality of programs from one tuner device incorporating n tuners to m decoder devices. One stream is transmitted, and each decoder device can simultaneously process a plurality of programs.

The tuner device according to claim 2 of the present invention is
N tuner units for selecting and receiving signals of different bands according to a request from the decoder device;
Digitally demodulating the outputs of the n tuner units in accordance with a signal modulation scheme, and outputting the n transport streams as n transport streams;
A program that exists on a one-to-one basis for each of the m decoder devices, and selects a program requested by the m decoder devices from the n transport streams output from the n digital demodulation units, and selects A stream re-multiplexing unit with descrambler function that de-scrambles the plurality of programs and re-multiplexes each into a single transport stream;
When descrambling is performed by the m number of descrambler-equipped stream re-multiplexing units, one common CAS card storing key data of contract information used for descrambling is accessed and descrambling is performed. One common CAS control unit for controlling;
The m transport streams output from the m descrambler function stream remultiplexing units to the m decoder devices existing one-to-one in the m descrambler function stream remultiplexing units. Each of the decoders external to the n stream remultiplexing units with the descrambler function for the n streams processed by the n digital demodulating units. After selecting a plurality of necessary programs in response to a request from the receiver, descrambling and re-multiplexing each stream, and sending each re-multiplexed stream from the stream transmission unit to each external decoder device (or function) Have.

The stream remultiplexing unit with a descrambler function according to claim 3 of the present invention,
The TS that receives the n transport streams, separates the selected transport stream from the n transport streams, and separates and outputs a plurality of requested program information including ECM / EMM scramble information. A separation unit;
A descrambler unit for inputting a plurality of program information including ECM / EMM scramble information from the TS separation unit, and descrambling and outputting a plurality of programs based on key data stored in the common CAS card When,
It is composed of a TS multiplexing unit that obtains a plurality of descrambled program information from the descrambler unit, multiplexes it into one transport stream, and selects it from n transport streams. The plurality of programs are descrambled and re-multiplexed into one transport stream.

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

  FIG. 1 shows the configuration of a digital broadcast receiving system according to an embodiment of the present invention. Similar to the conventional digital broadcast receiving system shown in FIG. 3, the digital broadcast receiving system is configured with n = 3 and m = 2. Specifically, the digital broadcast receiving system includes a tuner device 1 incorporating three tuners and two decoder devices 2 and 3.

  In FIG. 1, a tuner device 1 includes three tuner units 11, 12, 13, three digital demodulation units 14, 15, 16, two stream remultiplexing units 17, 18 with a descrambler function, a stream transmission unit 19, and a CAS. It comprises a CAS control unit 21 connected to a card 22. Among these components, the tuner units 11, 12, and 13, the digital demodulation units 14, 15, and 16, and the stream transmission unit 19 have the same configurations as those in FIG.

  The decoder device 2 includes a stream reception unit 27, a stream processing unit 29 with accumulation control, an AV decoder unit 30, and a storage unit 31, and the decoder device 3 includes a stream reception unit 32, a stream processing unit 34, and an AV decoder unit. 35. All the components in the decoder devices 2 and 3 have the same configuration as that of FIG. 3 showing the prior art.

  FIG. 2 shows the configuration of the stream remultiplexing units 17 and 18 with the descrambler function of FIG. The stream remultiplexing units 17 and 18 with a descrambler function are composed of TS demultiplexing units 41 and 44, descrambler units 42 and 45, and TS multiplexing units 43 and 46, respectively. The two descrambler units 42 and 45 share one CAS control unit 21 and one CAS card 22.

  The operation of the digital broadcast receiving system configured as described above will be described below with a focus on the stream remultiplexing units 17 and 18 with a descrambler function in the tuner device, which is different from the prior art.

  In the stream remultiplexing unit 17 with a descrambler function, n transport streams are input from the digital demodulation units 14, 15, 16 as described above. The TS separation unit 41 separates and outputs a plurality of requested program information including ECM / EMM scramble information from the input n transport streams. The descrambler unit 42 performs descrambling using the master key extracted from the CAS card 22 under the control of the common CAS control unit 21. The TS multiplexing unit 43 multiplexes a plurality of descrambled program information output from the descrambler unit 42 to generate and output one transport stream.

  Similarly, in the stream remultiplexing unit 18 with the descrambler function, the TS separation unit 44, the descrambler unit 45, and the TS remultiplexing unit 46 are used, and a single transport in which a plurality of descrambled program information is multiplexed is used. Create a stream. When processing is performed by the descrambler unit 45, descrambling is performed using the CAS control unit 21 and the CAS card 22 which are common to the stream remultiplexing unit 17 with the descrambler function.

  Since the digital broadcast receiving system of the present invention does not require a CAS card on the decoder side, it can be miniaturized. Further, since the CAS card on the tuner device side is shared, it has the effect of improving usability and is useful as a digital broadcast receiving system.

The block diagram which shows the structure of the system of the digital broadcast receiving system by embodiment of this invention The block diagram which shows the structure of the stream remultiplex part with a descrambler function shown in FIG. Block diagram showing the configuration of a conventional digital broadcast receiving system

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tuner apparatus 2, 3 Decoder apparatus 11, 12, 13 Tuner part 14, 15, 16 Digital demodulation part 17, 18 Stream remultiplex part with a descrambler function 19 Stream transmission part 21 CAS control part 22 CAS card 27, 32 Stream reception Unit 29 Stream processing unit with storage control 30, 35 AV decoder unit 31 Storage unit 34 Stream processing 41, 44 TS separation unit 42, 45 Descramble unit 43, 46 TS multiplexing unit

Claims (3)

Built-in n tuners (n is an integer of 2 or more), receives and demodulates signals in different bands, selects and re-multiplexes from n streams generated only by the program requested by the decoder device described later A tuner device that reconfigures the stream into m (m is an integer of 1 or more) streams and transmits the m streams;
The tuner device is requested for a plurality of programs to be selected, one of the m streams transmitted from the tuner device is received, and the plurality of programs in the stream are simultaneously video / audio. A digital broadcast receiving system comprising: m decoder devices that perform decoding processing or record processing in a storage unit. The tuner device includes:
N tuner units for selecting and receiving signals of different bands according to a request from the decoder device;
Digitally demodulating the outputs of the n tuner units in accordance with a signal modulation scheme, and outputting the n transport streams as n transport streams;
A program that exists on a one-to-one basis for each of the m decoder devices, and selects a program requested by the m decoder devices from the n transport streams output from the n digital demodulation units, and selects A stream re-multiplexing unit with descrambler function that de-scrambles the plurality of programs and re-multiplexes each into a single transport stream;
When descrambling is performed by the m number of descrambler-equipped stream re-multiplexing units, one common CAS card storing key data of contract information used for descrambling is accessed and descrambling is performed. One common CAS control unit for controlling;
The m transport streams output from the m descrambler function stream remultiplexing units to the m decoder devices existing one-to-one in the m descrambler function stream remultiplexing units. The digital broadcast receiving system according to claim 1, further comprising: a stream transmission unit that transmits The descrambler function stream re-multiplexing unit is
The TS that receives the n transport streams, separates the selected transport stream from the n transport streams, and separates and outputs a plurality of requested program information including ECM / EMM scramble information. A separation unit;
A descrambler unit for inputting a plurality of program information including ECM / EMM scramble information from the TS separation unit, and descrambling and outputting a plurality of programs based on key data stored in the common CAS card When,
The digital broadcast receiving apparatus according to claim 2, further comprising: a TS multiplexing unit that obtains a plurality of descrambled program information from the descrambler unit, multiplexes the program information into a single transport stream, and outputs the multiplexed information. system.

Images