| 摘要 |
A transmission system includes a transmission apparatus and a receiving apparatus for repeatedly transmitting and receiving a frame with plural time slots at a constant frequency, in which digital audio data of plural channels and auxiliary data required to playback the digital audio data are transmitted using previously allocated time slots. A multiplexer is provided for multiplexing, assuming an area made up of previously allocated time slots that are included in respective frames amounting to a number of a multiple of n as block data when the predetermined encryption unit is n bytes. The digital audio data and the auxiliary data are allocated as the block data wherein the auxiliary data is allocated to the time slots that are located at the same positions of respective plural frames within the block data, and the digital audio data is allocated in the time slots that are located at the same position in the respective frames amounting to the number of a multiple of n in the block data. An encryptor encrypts at least the digital audio data from the multiplexed block data in the predetermined encryption unit and a communication unit transmits the data encrypted in the encryptor, wherein the receiving apparatus decodes the encrypted data transmitted from the transmission apparatus.
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