Source: http://www.google.com/patents/US5764773?dq=6,332,126
Timestamp: 2017-05-27 04:00:16
Document Index: 795759293

Matched Legal Cases: ['art 561', 'art 45', 'art 561', 'art 561', 'art 45', 'art 568', 'art 56', 'art 47', 'art 45']

Patent US5764773 - Repeating device, decoder device and concealment broadcasting - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsIn a head end (3), which sends a satellite broadcasting signal received through a BS antenna to a connected cable, scrambled video and audio signals are separated by a separation part (11) from a satellite broadcasting signal. An information signal for descrambling and relevant information packets, which...http://www.google.com/patents/US5764773?utm_source=gb-gplus-sharePatent US5764773 - Repeating device, decoder device and concealment broadcastingAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS5764773 APublication typeGrantApplication numberUS 08/481,273PCT numberPCT/JP1994/001852Publication dateJun 9, 1998Filing dateNov 2, 1994Priority dateNov 5, 1993Fee statusLapsedAlso published asCN1082767C, CN1116027A, WO1995012951A1Publication number08481273, 481273, PCT/1994/1852, PCT/JP/1994/001852, PCT/JP/1994/01852, PCT/JP/94/001852, PCT/JP/94/01852, PCT/JP1994/001852, PCT/JP1994/01852, PCT/JP1994001852, PCT/JP199401852, PCT/JP94/001852, PCT/JP94/01852, PCT/JP94001852, PCT/JP9401852, US 5764773 A, US 5764773A, US-A-5764773, US5764773 A, US5764773AInventorsMasaaki NishiuraOriginal AssigneeKabushiki Kaisha ToshibaExport CitationBiBTeX, EndNote, RefManPatent Citations (6), Non-Patent Citations (2), Referenced by (20), Classifications (33), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetRepeating device, decoder device and concealment broadcasting
US 5764773 AAbstract
In a head end (3), which sends a satellite broadcasting signal received through a BS antenna to a connected cable, scrambled video and audio signals are separated by a separation part (11) from a satellite broadcasting signal. An information signal for descrambling and relevant information packets, which are multiplexed upon the audio signal, are further separated from each other by a separation part (13). The information signal for descrambling is packeted by a packeting part (45). Thereafter, the information signal is decoded, and an error correction code corresponding to the information signal is read out from a ROM and is added thereto. Subsequently, the packeted information packets for conducting the descramble and the relevant information packets separated from each other by the separation part (13) are multiplexed upon a vertical blanking period of time in the video signal by a VBI multiplexing part (51). The information packets are also multiplexed upon the relevant information packets, the information packets being positioned in preference to the relevant information packets within the multiplexed output. The scramble video signal from the VBI multiplexing part (51) and an audio signal, in which a scramble video signal of the satellite broadcasting signal is descrambled by a descrambler (39), are multiplexed in frequency by a frequency multiplexing part (53), and are sent out to a cable.
1. A repeating device for receiving a broadcasting signal which is transmitted through a first transmission system, and for sending the broadcasting signal to a second transmission system,wherein said broadcasting signal includes a scrambled signal, a first information signal for descrambling said scrambled signal, and relevant information packets, and wherein said repeating device comprises:separation means for separating and extracting said scrambled signal, said first information signal and said relevant information packets from the broadcasting signal; packeting means for generating first information-signal packets by packeting said first information signal; and multiplexing means for generating a multiplexed output by multiplexing said first information-signal packets and said relevant information packets upon said scrambled signal, and for outputting said multiplexed output to said second transmission system, said multiplexing means multiplexing said first information-signal packets upon each other, said first information-signal packets having preference over said relevant information packets with respect to an order of multiplexed packets within said multiplexed output. 2. A repeating device according to claim 1, wherein, when said relevant information packets are not included in said broadcasting signal, said multiplexing means generates said multiplexing output by multiplexing said first information-signal packets also to a part corresponding to a multiplexing area of said relevant information packets in said broadcasting signal.
4. A decoder for receiving a broadcasting signal which includes a scrambled signal, first information-signal packets for descrambling said scrambled signal, and relevant information packets,wherein said broadcasting signal is such that said first information-signal packets and said relevant information packets are multiplexed upon said scrambled signal, and said first information-signal packets are multiplexed upon each other, said first information-signal packets having preference over said relevant information packets with respect to an order of multiplexed packets, and wherein said decoder comprises:separation means for separating and extracting said scramble signal, said first information signal packets and said relevant information packets from said broadcasting signal; and descrambling means for descrambling said scrambled signal using said first information-signal packets and said relevant information packets, said descrambling means descrambling in accordance with said order of multiplexed packets. 5. A broadcasting apparatus comprising a repeating device for receiving a broadcasting signal which is transmitted through a first transmission system, and for sending said broadcasting signal to a second transmission system,wherein said broadcasting signal includes a scrambled signal, a first information signal for descrambling said scrambled signal, and relevant information packets, and wherein said second transmission system includes a contractor decoder, wherein said repeating device comprises:separation means for separating and extracting said scrambled signal, said first information signal and said relevant information packets from said broadcasting signal; packeting means for generating first information-signal packets by packeting said first information signal; and multiplexing means for generating a multiplexing output by multiplexing said first information-signal packets and said relevant information packets upon said scrambled signal, and for outputting said multiplexed output to said second transmission system, said multiplexing means multiplexing said first information-signal packets upon each other, said first information signal packets having preference over said relevant information packets with respect to an order of multiplexed packets within said multiplexed output, and wherein said contractor decoder comprises:separation means for separating and extracting said scrambled signal, said first information-signal packets and said relevant information packets from said multiplexing output; and descrambling means for descrambling said scrambled signal using said first information-signal packets and said relevant information packets, said descramblinq means descrambling in accordance with said order of multiplexed packets within said broadcasting signal. 6. A broadcasting apparatus comprising a repeating device for receiving a broadcasting signal which is transmitted through a first transmission system, and for sending said broadcasting signal to a second transmission system,wherein said broadcasting signal includes a scrambled signal, a first information signal for descrambling said scrambled signal, and relevant information packets, and wherein said second transmission system includes a contractor decoder, wherein said repeating device comprises:separation means for separating and extracting said scrambled signal, said first information signal and said relevant information packets from said broadcasting signal; packeting means for generating first information-signal packets by packeting said first information signal; and multiplexing means for generating a multiplexing output by multiplexing said first information-signal packets and said relevant information packets upon said scrambled signal and, when said relevant information packets are not included in said broadcasting signal, by multiplexing said first information-signal packets also to a part corresponding to a multiplexing area of said relevant information packets in said broadcasting signal, and for outputting said multiplexed output to said second transmission system, said multiplexing means multiplexing said first information-signal packets upon each other, said first information signal packets having preference over said relevant information packets with respect to an order of multiplexed packets within said multiplexed output, and wherein said contractor decoder comprises:separation means for separating and extracting said scrambled signal, said first information signal and said relevant information packets from said multiplexing output; and descrambling means for descrambling said scrambled signal using said first information-signal packets and said relevant information packets, said descrambling means descrambling in accordance with said order of multiplexed packets within said broadcasting signal. 7. A broadcasting apparatus comprising a repeating device for receiving a broadcasting signal which is transmitted through a first transmission system and for sending said broadcasting signal to a second transmission system,wherein said broadcasting signal includes a scrambled signal, a first information signal for descrambling said scrambled signal, and relevant information packets, and wherein said second transmission system includes a contractor decoder, wherein said repeating device comprises:separation means for separating and extracting said scrambled signal, said first information signal and said relevant information packets from said broadcasting signal; packeting means for generating first information-signal packets by packeting said first information signal, said packeting means including memory means for storing a plurality of error correction codes corresponding to signal contents of said first information signal, wherein said error correction codes are read from said memory means and added to said first information signal when said first information signal is packeted; and multiplexing means for generating a multiplexing output by multiplexing said first information signal packets and said relevant information packets upon said scrambled signal, and for outputting said multiplexing output to said second transmission system, said multiplexing means multiplexing said first information-signal packets upon each other, said first information-signal packets having preference over said relevant information packets with respect to an order of multiplexed packets within said multiplexed output, and wherein said contractor decoder comprises:separation means for separating and extracting said scrambled signal, said first information signal and said relevant information packets from said multiplexing output; error correction means for performing error correction of said first information signal packets using said error correction codes; and descrambling means for descrambling said signal using said first information signal packets and said relevant information packets, said descrambling means descrambling in accordance with said order of multiplexed packets within said broadcasting signal. Description
This invention relates to repeating devices, decoder devices and encryption and broadcasting apparatuses and, particularly, to repeating devices, decoder devices and encryption and broadcasting apparatus used in a CATV (Community Antenna TV, Cable TV) or the like which individually receive encrypted broadcasting from an antenna and/or a cable.
In recent years, encrypted broadcasting(broadcasting available only for specific viewers) has become more prevalent, and a receiving device for receiving encrypted broadcasting has become more common. Encrypted broadcasting, which uses an encryption and broadcasting apparatus, is arranged such that a broadcasting station encrypts video and audio signals (a process hereinafter referred to as "scrambling") before the signals are transmitted so that persons outside the intended audience who receive the encrypted signals are unable to understand/decipher them. In contrast, the intended audience is provided with decoder devices (hereinafter referred to as "decoders") having a descrambler to decode (a process hereinafter referred to as "descrambling") the scrambled signal, to reproduce the original audio and video signals. Moreover, the arrangement is such that only persons outside the intended audience are prohibited from descrambling the scrambled signal, rendering those persons incapable of receiving the information carried in the scrambled signal.
Decoding devices 5 (hereinafter referred to as "VBI corresponding decoders"), which correspond to the plurality of VBI multiplexing devices for the respective users, are connected to the cable 4. Each of the VBI corresponding decoders 5 conducts AM detection using a VHF•UHF tuner, and conducts separation of the scrambled video signal and the audio signal from each other. Further, the VBI corresponding decoders 5 separate the packets which are superimposed upon the VBI of the scrambled video signal. Thereafter, the scrambled video signal is descrambled based on information packets. In this connection, the audio signal is further demodulated in audio. The demodulated video signal and audio signal are inputted to a television (TV) (not shown).
The satellite broadcasting apparatus of the COATEC system described above has the following problem in the head end and the VBI decoder corresponding thereto:
FIG. 1 is a block diagram showing a schematic arrangement of an embodiment of a head end of a concealment broadcasting apparatus according to the invention;
FIG. 8 shows the priority judgment signals corresponding respectively to the packets which are supplied to the selector 47 in FIG. 6. In the selector 47, if the output from the TS=1 detection part 561 is "1", (Y0, Y1) becomes (0, 0) regardless whether the respective outputs from the counters 565˜567 are "1" or "0". The selector 47 preferentially selects the scramble timing TS packets from the packeting part 45, and outputs the same. Moreover, if the output from the counter 566 is "1" under the condition that the output from the TS=1 detection 561 is "0", (Y0, Y1) becomes (0, 1) regardless of the outputs from the other counters 566 and 567. In such a case, the selector 47 preferentially selects the common information packets from the buffer memory 41, and outputs the same. Furthermore, if the output from the counter 566 is "1", assuming the output from the TS=1 detection part 561 is "0" and the output from the counter 565 is "0", (Y0, Y1) becomes (1, 0) regardless of the output from the other counter 567. In such a case, the selector 47 selects the individual information packets from the buffer memory 43, and outputs the same. Further, if the output from the TS=1 detection part 561 is "0", assuming the output from the counter 565 is "0", the output from the counter 566 is "0" and the output from only the counter 567 is "1", (Y0, Y1) becomes (1, 1). In this case, the selector 47 selects the message information packet from the buffer memory 55, and outputs the same. Accordingly, the priority order in which the four packets inputted to the selector 47 are selected and outputted becomes that shown in FIG. 8.
Furthermore, in FIG. 7, when the scramble timing TS is "0", and the respective outputs from the other counters 565˜567 are "0" (that is, when there is no scramble timing TS and there are no packets of the common information, the individual information and the message information), the judgment signal (Y0, Y1) becomes (0, 0). As such, values of the TS and VS packets (that is, the scramble timing TS packet from the packeting part 45 are selected and are outputted. From the above, it is possible to determine or decide the packet priority order at the time the plurality (four are shown, e.g., in the figure) of inputted packets are multiplexed upon each other in time sharing (are VBI-multiplexed upon each other, as a consequence). Further, even when there are entirely no input packets, the TS and VS packets are outputted. Accordingly, there is always a free area in the VBI multiplexing part of the video signal. Thus, it is possible to hold or retain the continuity of the descramble processing in the VBI corresponding decoder 5.
A method of protection with respect to the errors will be described. However, this includes a method of successively sending the same packets, a method of adding the error correction codes to conduct correction or revision, and a method of successively sending the same data (all 0, all 1 or the like, for example) so that the data are judged, in majority, on the receiving side, or the like. In view of this, the protection against the errors as shown in the following (1)˜(3) is conducted with respect to the relevant information packets and the scramble timing TS packets.
With regard to the majority judgment of the common information packets on the decoder side, the majority judgment corresponding to thrice successive sending is conducted regarding each of the bit digits of the first bit ˜ the 182nd bit, with regard to the data portion 182 bits which are successively sent thrice. Specifically, regarding the same digit of the data portion of the packet, if the bit values equal to ore more than twice the bit values corresponding to thrice successive sending are the same as each other, the bit values equal to or more than twice are deemed to be a correct bit value. If the bit values equal to or more than twice are 0!, it is judged as being 0!; if the bit values equal to or more than twice are 1!, it is judged as being 1!. For example, with regard to the data consisting of 182 bits which are successively sent thrice, 0001 . . . ! is received by the twice transmission, 0101 . . . ! is received by the twice transmission, and 0111 . . . ! is received by the thrice transmission. Then, since, with regard to the first bit, three bits which are successively sent thrice are 0, 0, 0!, it is judged as being 0! as a result of the majority judgment. Since, with regard to the second bit, three bits which are successively sent thrice are 0, 1, 1!, it is judged as being 1! as a result of the majority judgment. Since, with regard to the third bit, three bits which are successively sent thrice are 0, 0, 1!, it is judged as being 0! as a result of the majority judgment. Since, with regard to the fourth bit, three bits which are successively sent thrice are 1, 1, 1!, it is judged as being 1! as a result of the majority judgment. Hereunder, the majority judgment is conducted similarly also regarding each of the digits until 182nd bit. In this manner, the arrangement is such that the majority judgment is conducted by the unit of each of the digits of the packets which are transmitted so that the correct judgment result is first acquired.
FIG. 10 shows a timing chart of the satellite system, while FIG. 11 shows a timing chart in the head end. In the satellite system, the packets are such that a single packet is superimposed for each super frame which has 9 frames of the audio data. In the head end, the packets corresponding to every super frame are transmitted in superimposition upon two lines of the video signal (the seventeenth and the nineteenth lines in the first field, the two-hundred and eightieth and the two-hundred and eighty-second lines in the second field) for each occurrence of the video field signal (the vertical synchronization signal). In FIG. 11, the relevant information packets from the satellite wave are shown to be superimposed upon the seventeenth line. If there is no relevant information in the subsequent nineteenth line (this time corresponds to case where there is no counter output from the counters 565˜567 in FIG. 6), the priority judgment signal which is outputted from the judgment part 568 (refer to FIG. 7) becomes (0, 0) in the priority judgment part 56. In the time-sharing multiplexing part 47, the scramble timing TS packets (TS and VS packets) from the packeting part 45 are selected based on the priority judgment signal. Accordingly, the state or condition (TS=0 and VS=0) of the TS and VS packets at that time is outputted to the nineteenth line and is VBI-multiplexed).
As described above, according to the invention, in the repeating device in which the information signal for conducting the descramble is packeted and is multiplexed upon the vertical blanking period of time of the video signal of the concealment satellite broadcasting, so as to be sent out to the cable, the information packets for conducting the descramble are multiplexed upon each other, in preference to the relevant information packets, upon packet multiple. Accordingly, it is possible to hold or retain the continuity of the descramble processing. Furthermore, upon packeting of the information signal for conducting the descramble, the information signal for conducting the descramble is encoded, and the error correction code corresponding thereto is read out from the memory means and is added. Accordingly, coding of the error correction is easy, and it is possible to provide the concealment broadcasting apparatus which is high in correction probability.
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