| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission system which transmits multi-channel audio data of the DVD-Audio or the like efficiently on a transmission line using fixed length frames according to the MOST method, and takes measures for copyright protection of audio data. SOLUTION: Block data created by a multiplexer 51 of a transmission apparatus 22 are composed of 8 frames, and first 1 byte of each frame is allocated to a header 101 having Sync, OE and the like, the second byte is allocated to auxiliary data 102 including AUX data required for reproducing audio data and copyright protect information, and remaining bytes are used to transmit audio data 103. An encryptor 52 carries out an encryption process for the second and later bytes of each frame, and a communication means 53 outputs encrypted data. A communication means 61 of a receiving apparatus 23 receives the encrypted data from the transmission apparatus 22, a decoder 62 decodes the encrypted data, and a demultiplexer 63 demultiplexes the audio data 103 and the auxiliary data 102. COPYRIGHT: (C)2006,JPO&NCIPI
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