JP3006465B2 - Pay broadcasting system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pay-broadcasting system, and more particularly, to a system for transmitting contract information relating to a contract of a subscriber of a pay-broadcast, wherein a receiving device includes an individual associated with the subscriber included in the contract information. The present invention relates to a pay broadcasting system that determines whether or not descrambling of a broadcast program can be canceled based on contract information.

[0002]

2. Description of the Related Art Generally, in pay satellite broadcasting, a video and audio signal is scrambled and transmitted so that a person other than a viewing contractor cannot view the signal. The receiver who has subscribed to the viewing has a receiving device equipped with a semiconductor integrated circuit having a descrambler for descrambling the scrambled video / audio signal, and restores and views the video / audio signal with the semiconductor integrated circuit. .

Referring to FIG. 5, a receiving device used in a conventional pay satellite broadcasting system will be described. In general,
The circuit shown in FIG. 5 includes an LS for a pay satellite broadcast decoder in the receiver.
I included. The decoder LSI device includes a packet data extraction circuit 31, a separation circuit 321 for separating packet data into common information and individual information (contract information), a circuit 322 for separating a work key (Kw) from individual information, and a scramble key (Ks). ), A circuit 331 for decoding individual information based on a master key (Km) unique to the receiving device, a circuit 332 for decoding program information, and a memory holding Kw (hereinafter referred to as a Kw memory). ) 34, Kw
(Hereinafter referred to as individual information memory) 35, a viewing permission / non-permission judgment circuit 36 for judging whether or not viewing is possible from the decoded individual information, a PN generator 37, a descrambling circuit 38, and an audio demodulation circuit 39. Having.

Here, in order to descramble the video / audio signal and watch pay satellite broadcasting, the receiving side receives contract information multiplexed with the video / audio signal and transmitted.
It is necessary to extract and store personal contract information unique to the receiving device from the contract information and descramble using this personal contract information.

First, audio data is demodulated from a bit stream input by an audio demodulation circuit 39, and a packet data extraction circuit 31 extracts packet data from a data portion where no audio data exists. The extracted packet data is separated by the separation circuit 321 into common information having program information and individual information having contract information. The individual information is converted by the decoding circuit 331 into the unique Km of the receiving device.
Is decrypted. The Kw is separated from the decoded individual information by the separation circuit 322 and stored in the Kw memory 34. Individual information other than Kw is stored in the individual information memory 35.

On the other hand, the common information is decoded by the decoding circuit 332 using the previously stored Kw. Ks is separated by the separation circuit 323 from the decoded common information and stored in the PN generator 37. The common information other than Ks and the individual information already stored in the individual information memory 35 are determined by the viewability determination circuit 36. If the viewability is possible, the descramble circuit 38 is turned ON, and the video output and the audio output Is descrambled. If viewing is impossible, the descrambling circuit 38 is turned off, and the video output and the audio output are not descrambled.

The above-mentioned conventional packet data extraction circuit 31 will be described in more detail with reference to FIG. A packet data extracting circuit 31 generates a packet data string selecting circuit 311, a 1-bit × 576 word memory 312 for selecting a packet data extracting column, and generates an address, a bank switching signal, and a read / write signal for the memory. A memory control circuit 313 that performs header detection and majority processing of the extracted packet data, an error correction circuit 315 that corrects the data from the packet data processing circuit when there is an error, and Timing generation circuit 3 for generating various timings
Sixteen.

In FIG. 6, SF is 9 ms (hereinafter, m
S), a superframe signal having a period (hereinafter, referred to as S)
CLK is a clock, DSY
C is a frame synchronization signal (hereinafter referred to as DS) indicating a 1 mS cycle.
YAT), DATI is an audio data input signal (hereinafter, referred to as DATI), and PDAT is a packet data output (hereinafter, PDAT).

In the packet data extraction circuit 31, DAT
From I, the packet data is extracted from the data part where no voice data exists by the column selection circuit 311, and the packet data is temporarily stored in the 1-bit memory 312. The timing generation circuit 316 generates timing from the superframe and DSYC and CLK indicating a 1 mS cycle,
The memory control circuit 313 generates an address, a bank switching signal, and a write / read signal according to this timing, and stores, for example, 288-bit packet data in the memory 312 at a cycle of 9 ms. The packet data is sequentially extracted from the memory 312 to the packet processing circuit 314,
After data processing such as header detection and majority decision processing in the packet processing circuit 314, the data is output as PDAT via the error correction circuit 315.

FIG. 7 shows a method of transmitting contract information in a pay broadcast and a method of processing the same, taking the A mode as an example. In the A mode, the frame synchronization signal and the control signal are arranged in one column (one bit), the range bit is arranged in one column, and audio 1 to audio 4 are each 10 bits.
The column and the independent data section are each composed of 15 columns of data, and the error correction code is composed of 7 columns of data. Each column of the independent data section includes 9 frames of data including 32 bits in one frame, and 288 bits of data. It is configured as one superframe that forms one unit. Here, when the A1 mode (voice 1, voice 2, voice 3, and voice 4 include voice data) is employed, one of 15 columns (bits) of the independent data portion is used to enter contract information. Is sent.

Conventionally, many proposals have been made regarding descrambling of pay satellite broadcasting. For example, if the subscriber of a pay-satellite broadcaster must always renew his contract if he / she contracts in the next month, he replaces the contract information currently in the contract stored in the decoder with the contract information for the next month. Must-have. For example, Japanese Patent Application No. Hei 3-6195
In the method of updating the descrambling key information of the pay broadcasting system described in Japanese Patent Publication No. 4 (1993), a display for judging whether or not the contract information has been normally rewritten has a display device, which enables the contract information to be updated before the start of the contract period. The descrambling key information of the contract viewer is updated appropriately.

In the method related to descrambling described in Japanese Patent Application No. 1-47055, the date and time at which the contract information is transmitted is stored in advance so that the contract information can be received even when the power of the decoder is turned off. A circuit is provided for automatically turning on the decoder even when the power is off. As a result, the descrambling key information of the contract viewer can be accurately updated before the start of the contract period.

[0013]

As described above, in order to descramble a pay satellite broadcast so that it can be viewed on the receiving side, the pay satellite broadcast must be included in the contract information multiplexed and transmitted to the video and audio signals. It is necessary to receive and store the personal contract information on the receiving side and descramble using this personal contract information. However, as the number of receiving households increases, the time required for the receiving side to extract the personal contract information increases.

[0014] For example, assume that 2 million households have a subscription and that the subscription must be renewed at the same time. Here, about 1 mS is required to transmit one frame, and one contract information includes data of nine frames. Therefore, transmitting one contract information requires 9 mS. Now, assuming that the transmitting side can transmit about 100 contract information per second, 20,000 seconds are required to send 2 million cases, so the last contractor is his / her personal contract information. 5 hours and a half (20,000 seconds $ 3
You have to wait for as long as 600┤5.5). Alternatively, if the transmitting side transmits contract data of a plurality of columns and the receiving side receives the plurality of columns of data and extracts personal contract information therefrom, the descrambling of the receiving device is required. The circuit scale is too large.

[0015] In view of the above, the present invention does not increase the circuit scale of the pay broadcast receiving apparatus, but from when contract information is transmitted at the time of contract renewal, etc., to when descrambling is performed and the receiving apparatus can receive the information. It is an object of the present invention to provide a pay-broadcasting system capable of shortening the required time.

[0016]

In order to achieve the above object, a pay broadcasting system according to the present invention transmits and receives contract information on a contract of a subscriber of a pay broadcast, and obtains personal contract information included in the contract information. In a pay broadcasting system that determines whether or not to descramble a broadcast program based on
A transmitter for transmitting the pay broadcast which includes packet data of a plurality of rows forming a contract information for a plurality of subscribers in the packet data of one superframe, the fee received
Contract information from packet data of one superframe of broadcasting
Contract information extracting means for extracting a column of information for a plurality of pieces of contract information, at least two memory units, and operating each of the memory units alternately or sequentially in a read mode and a write mode. The extracted plural
Sequentially write a large number of columns as the contract information of the
Read out a plurality of contract information
A memory control unit for reading from a memory unit of the server, personal contract information extracting means for extracting personal contract information included in the contract information read from the memory unit, and a broadcast program based on the extracted personal contract information. And a receiving apparatus having a descrambling descrambling judging means for judging whether descrambling can be canceled or not.

Here, in the pay broadcasting system of the present invention, the personal contract information extracting means may include a plurality of packet processing circuits for performing packet processing of the contract information. In this case, by appropriately selecting the number of processing circuits, it is possible to appropriately cope with the transmission speed of the contract information.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG.
FIG. 5 is a schematic timing chart showing transmission of contract information and signal processing thereof, which is adopted in one embodiment of the pay broadcasting system of the present invention.

In FIG. 3, the descrambling device of the receiving device includes a bank # 0 and a bank #
One memory unit is provided. The contract information is transmitted using, for example, eight out of fifteen columns of the signal of the independent data part included in the audio data signal. Eight columns of contract information each including 288 bits are transmitted as contract information 1 to contract information 8 and written into the memory unit of bank # 0 in the write mode among the two memory units. At this time, from the memory unit of the bank # 1 in the read mode, the contract information 1 'to the contract information 8', which are the contract information data received immediately before, are read out one packet at a time. It is determined whether or not the eight columns of contract information include personal contract information corresponding to the receiving device. If personal contract information is included, it is extracted, and based on this, it is determined whether or not scrambling is possible.

If the read contract information in the eight columns does not include the corresponding personal contract information, the contract information data is discarded from the memory unit, and the new transmitted next new contract information is transmitted. Rewritten with the contract information in the column. At the time of rewriting, the eight lines of contract information already written in the memory unit of the other bank # 0 are sequentially read and processed.

Since each memory unit operates alternately in the write mode and the read mode, each of the eight memory units is sequentially transmitted.
The contract information in the column is temporarily stored in the memory unit of the receiving device,
When the collation is completed, it is rewritten by the contract information of eight columns transmitted next. This makes it possible to extract personal contract information from a large number of lines of contract information and determine whether or not to scramble, without causing a significant increase in the circuit scale of the personal contract information extracting means of the receiving device.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a pay broadcasting system according to an embodiment of the present invention; Here, as an example, it is assumed that audio data is transmitted in the A1 mode of satellite broadcasting, and the contract information composed of packet data contains 8 out of 15 columns of the independent data section that does not include audio data. It is assumed that they are in the column.

The pay broadcast system according to the first embodiment of the present invention
This receiver differs from the conventional pay satellite receiver described with reference to FIG. 5 only in the configuration of the packet data extraction circuit, and the other elements have the same configuration. Therefore,
Detailed description of other elements is omitted.

FIG. 1 shows a packet data extracting circuit in the receiver of the pay broadcasting system of the above embodiment. This packet data extraction circuit is included in, for example, a semiconductor integrated circuit for a pay satellite broadcast receiver (a pay satellite broadcast decoder LSI). FIG. 3 shows the processing performed by the packet data extraction circuit.

The packet data extracting circuit 1 includes a packet data string designating circuit 111 for designating a packet data extracting string, a packet data string selecting circuit 112 for selecting a packet data extracting string, and converting serial data into parallel data. A serial / parallel converter (hereinafter, referred to as an S / P circuit) 121 for conversion, a parallel / serial converter (hereinafter, referred to as a P / S circuit) 122 for converting parallel data into serial data, and 8 bits × 57.
A memory 13 having a capacity of 6 words, which is divided into two banks and controlled, a packet data processing circuit 14 for detecting a header of the extracted packet data and performing a majority decision processing, and storing data from the packet data processing circuit 14 An error correction circuit 15 for error correction, a write signal generation circuit 161 for generating a plurality of columns of write signals (WE2 to WE8) for the memory 13, and a plurality of columns of read signals (OE2 to OE8) for the memory 13. The read signal generation circuit 162 and the memory 13 generate addresses (AD0 to AD0).
AD8), a bank switching signal) BANK), and read / write signals (WE1 to WE8, OE1 to OE8), and a timing generation circuit 18 for generating various timings.

In FIG. 1, SF is a super frame signal (hereinafter, referred to as a super frame), CLK is a clock, DSYC is a frame synchronization signal (hereinafter, DSYC), and DATI is a voice data input signal (hereinafter, DATI).
RP00 to RP14 are column designation input signals (hereinafter, RP00 to RP14) for designating each column.

The packet data extraction circuit 1 in the above embodiment extracts packet data from an independent data portion (15 columns in A1 mode) having no audio data in DATI. This extraction is performed by selecting a required number of columns from among 15 columns.
Eight arbitrary columns are selected from RP14. Here, when the column designating circuit 111 validates the eight columns RP00 to RP07, the column selecting circuit 112 calculates a total of eight from the left side of the independent data section.
A column is selected, and packet data is extracted from these eight columns.

The write signal generation circuit 161 outputs eight write signals to the memory 13 within one write mode period when eight columns RP00 to RP07 are specified by the column specification circuit 111. Column selection circuit 112
Are serially / parallel converted by the S / P circuit 121 and are temporarily written to one bank of the 8-bit memory 13. Here, in accordance with the timing generated by the timing generation circuit 18 from the superframe and DSYC and CLK indicating the 1 mS cycle, the memory control circuit 17 stores the memory 13 based on the address, the bank switching signal, and the write / read signal. Control. Thereby, 288 in a 9 mS cycle
Bit packet data is written to or read from the memory 13.

The bank of the memory is switched at the timing of the next superframe. Eight columns of packet data written in the write mode before the bank switching are read by the read signal of the read signal generation circuit 162,
Parallel / serial conversion is performed by the P / S circuit 122. This data is separated from the packet processing circuit 1 by a time interval in anticipation of the processing time of the packet processing circuit 14 at the next stage.
4 is input. After performing the header detection and the majority decision, the packet processing circuit 14 outputs eight packet data via the error correction circuit 15.

Since the memory 13 temporarily stores the packet data of each of the eight columns while sequentially switching the two banks, the packet processing circuit 14 can process the data within the processing capability range. . in this way,
In the pay satellite broadcast receiving apparatus of this embodiment, packet data is received in a plurality of columns and processed by one packet processing circuit 14, so that even when contract information is sent to a large number of subscribers, the receiving apparatus side Without increasing the circuit size of the packet processing circuit, the time required from when the contract information is transmitted to when the corresponding personal contract information is extracted and descrambled is shortened.

Also, in the case where descrambling is canceled by receiving an application for a receiving contract from the receiver by telephone, the configuration in which the contract information is sent in a large number of lines as described above is adopted, so that the receiving is performed after receiving the communication. The time until the contract information is received on the side is reduced.

FIG. 2 shows a packet data extraction circuit in a receiver of a pay broadcasting system according to a second embodiment of the present invention.
Are shown in the same manner as in the embodiment. The configuration of the receiving device is the same as that shown in FIG. FIG. 4 shows this signal processing.

The packet data extracting circuit 2 includes a packet data string specifying circuit 211 for specifying a packet data extracting column, a packet data string selecting circuit 212 for selecting a packet data extracting column, and converting serial data to parallel data. A serial / parallel converter (hereinafter, referred to as S / P circuit) 221 for conversion, a serial / parallel converter (hereinafter, referred to as P / S circuit) 222 for converting parallel data into serial data, 15 bits × 5
A memory 23 having a two-bank configuration of 76 words, packet data processing circuits 241 and 242 for performing header detection and majority processing of extracted packet data, and error correction circuits 251 and 252 for correcting data from the packet data processing circuit. A write signal generation circuit 261 for generating a plurality of columns of write signals for a memory; a read signal generation circuit 26 for generating a plurality of columns of read signals to a memory
2. A memory control circuit 27 for generating an address, a bank switching signal, and a read / write signal for a memory, a timing generation circuit 28 for generating various timings, and an arbitration for combining processed packet data into a series of data. It has a circuit 29.

In FIG. 2, SF is a super frame signal, CLK is a clock, DSYC is a frame synchronization signal, DATI is an audio data input signal, RP00 to RP1.
4 is a column designation input signal for designating each column.

As in the first embodiment, the column designating circuit 211
In order to extract the packet data from the independent data part (15 columns in the A1 mode) having no DATI audio data, all of the 15 columns required in this case are selected from the 15 columns (see FIG. 4). ). Here, the column designation circuit 211
When all of RP00 to RP14 are enabled to designate 15 columns, the column selection circuit 212 selects all 15 columns of the independent data section, and packet data is extracted from these 15 columns.

The write signal generation circuit 261 outputs a write signal of 15 columns to the memory 23 when 15 columns from RP00 to RP14 are designated. The packet data of 15 columns extracted from the column selection circuit 212 is
Serial / parallel converted by the S / P circuit 221,
The data is temporarily written to the bank # 0 which is one bank of the memory 23 having a 15-bit configuration. Timing generation means 2
8 generates a timing from a super frame and DSYC and CLK indicating a 1 mS cycle,
7 controls the memory 23 based on the address, the bank switching signal, and the write / read signal in order to extract 288 bits of packet data at a cycle of 9 mS.

Since the bank of the memory is switched at the timing of the next superframe, the contract information 1 to 15 which are the packet data of 15 columns stored before the bank switching are read by the read signal of the read signal generation circuit 262. It is read out and input to the P / S circuit 222. The operation so far is basically the same as that of the first embodiment.

The packet data input to the P / S circuit 222 is subjected to parallel / serial conversion, input to the next packet processing circuit, and subjected to header detection and majority decision processing. Here, two sets of the packet processing unit including the packet processing circuit and the error correction circuit are provided in consideration of the processing capability of the packet processing unit. The fifteen packet data are alternately given to one or the other packet processing unit, divided into two, and processed in parallel by the two packet processing units. The outputs of both packet processing units are respectively input to the arbitration circuit 29, and output as a series of 15 packet data by the arbitration circuit 29.

In this embodiment, considering the processing time of the packet processing circuit and the error correction circuit, the packet extraction circuit
A set of packet processing units is provided. The number of packet processing units can be arbitrarily selected so as to match the transmission speed of the contract information. By providing a plurality of packet processing units, it becomes easy to match the processing capability of the packet processing units with the transmission speed of the contract information data. Therefore,
Even if a larger amount of contract information is transmitted, the receiving apparatus can easily cope with the transmission.

[0040]

As described above, in the pay broadcasting system of the present invention, a large number of contract information data can be received and processed by the receiving apparatus, so that the scale of the circuit necessary for receiving the contract information is obtained. Without significantly increasing the time required from the start of transmission of contract information such as a renewal contract to the descrambling on the receiving side, resulting in a remarkable effect of reducing the waiting time.

Further, regarding a column for sending contract information,
If an arbitrary number can be specified or changed as required, the degree of freedom in operation of the pay broadcasting system is increased while suppressing an increase in the circuit scale of the receiving device.

[Brief description of the drawings]

FIG. 1 is a block diagram of a packet data extraction circuit in a receiver of a pay broadcasting system according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a packet data extraction circuit in a receiver of a pay broadcasting system according to a second embodiment of the present invention.

FIG. 3 is a schematic timing chart showing processing of contract information in the embodiment of FIG. 1;

FIG. 4 is a schematic timing chart showing processing of contract information in the embodiment of FIG. 2;

FIG. 5 is a block diagram showing a configuration of a conventional pay satellite broadcast receiving apparatus.

FIG. 6 is a block diagram of a packet data extraction circuit of a conventional pay satellite broadcast receiver.

FIG. 7 is a schematic timing chart showing processing of conventional contract information.

[Explanation of symbols]

 Reference Signs List 1 packet data extraction circuit 111 packet data string designation circuit 112 packet data string selection circuit 121 serial / parallel conversion circuit 122 parallel / serial conversion circuit 13 memory 14 packet data processing circuit 15 error correction circuit 161 write signal generation circuit 162 read signal generation circuit Reference Signs List 17 memory control circuit 18 timing generation circuit 2 packet data extraction circuit 211 packet data string designation circuit 212 packet data string selection circuit 221 serial / parallel conversion circuit 222 parallel / serial conversion circuit 23 memory 241 packet data processing circuit 242 packet data processing circuit 251 Error correction circuit 252 Error correction circuit 261 Write signal generation circuit 262 Read signal generation circuit 27 Memory control circuit 28 Timing generation circuit 31 Packet data extraction circuit 321, 322, 323 Separation circuit 331, 332 Decoding circuit 34 Kw memory 35 Individual information memory 36 Viewability judgment circuit 37 PN generator 38 Descramble circuit 39 Audio demodulation circuit Km Master key Kw Work key Ks Scramble key 31 packet data extraction circuit 311 packet data string selection circuit 312 memory 313 memory control circuit 314 packet data processing circuit 315 error correction circuit 316 timing generation circuit SF superframe CLK clock DSYC frame synchronization signal DATI audio data input signal RP00-RP14 column designation input signal

Claims (2)

(57) [Claims] 1. A pay broadcasting system for transmitting and receiving contract information relating to a contract of a subscriber of a pay broadcast and determining whether or not to descramble a broadcast program based on personal contract information included in the contract information. 1 Super off a plurality of rows and transmitting apparatus for transmitting a pay broadcast packet data included in the packet data of one superframe, said received pay broadcast which forms a contract information for the subscriber
From the packet data of the frame
Contract information extracting means for extracting contract information, at least two
And One of the memory unit, said each memory unit is operated alternately or sequentially in read mode and a write mode, the serving as the extracted plurality of contract information in the memory portion of the write mode multi
It is composed by writing several columns sequentially and writing many columns sequentially.
A plurality of contract information to be read from the memory unit in the read mode.
A memory control unit for reading from the memory unit, personal contract information extracting means for extracting personal contract information included in the contract information read from the memory unit, and descrambling of a broadcast program based on the extracted personal contract information. And a receiving device having a descrambling descramble judging means for judging whether or not the broadcasting is possible. 2. A method according to claim 1, wherein said personal contract information extracting means performs a plurality of packet processing for packet processing of contract information data.
The pay broadcasting system according to claim 1, further comprising a circuit .