Transmission system

A transmission system for use with data comprising digital audio data of a plurality of channels and auxiliary data required to play back the digital audio data, said transmission system comprising:

• a transmission apparatus comprising an encryption unit with a plurality of multiplexers and an encryptor, the combination of which encrypts the digital audio data using a data structure that comprises a region with a plurality of frames, each with time slots that include previously allocated time slots in respective n frames;
• and
• a receiving apparatus in communication with the transmission apparatus;
• and
• a communication unit coupled to each of the transmission apparatus and the receiving apparatus,
• wherein the communication unit is configured to generate a clock signal,
• wherein the transmission apparatus and the receiving apparatus are responsive to the clock signal and to a periodic signal with a cycle that depends on the number of frames in the region so that the auxiliary data and the encrypted digital data are found in time slots of respective frames of the region, and
• wherein the auxiliary data includes channel assignment information that indicates which of the channels of the digital audio data is assigned to which of the time slots.

A transmission system for use with data comprising digital audio data of a plurality of channels and auxiliary data required to play back the digital audio data, said transmission system comprising:

• a transmission apparatus that is configured to encrypt the digital audio data using a data structure that comprises a region with a plurality of frames, each with time slots that include previously allocated time slots in respective n frames;
• a receiving apparatus comprising a decoding unit with a plurality of de-multiplexers and a decoder, the combination of which is configured to decode the digital audio data;
• and
• a control unit coupled to each of the transmission apparatus and the receiving apparatus,
• wherein the communication unit is configured to generate a clock signal,
• wherein the transmission apparatus and the receiving apparatus are responsive to the clock signal and to a periodic signal with a cycle that depends on the number of frames in the region so that the auxiliary data and the encrypted digital data are found in time slots of respective frames of the region, and
• wherein the auxiliary data includes channel assignment information that indicates which of the channels of the digital audio data is assigned to which of the time slots.