Patent ID: 7613615

Claim:
An audio system comprising: input circuitry for inputting a stream of audio data shuffled in accordance with a selected shuffling algorithm; a de-shuffler for de-shuffling the stream of audio samples, the de-shuffler operable to: store a first audio sample of each data sync block of each track of an audio block in a buffer location corresponding to an address generated from a look-up table; and store each remaining audio sample of each data sync block of each track of the audio block in a buffer location corresponding to an address generated by incrementing by an incrementation value from a base address provided by the address generated from the look-up table, wherein the incrementation value is selected according to the selected shuffling algorithm; a memory for storing a sequence of de-shuffled audio samples of an audio block output from the buffer locations, wherein the memory stores two copies of the de-shuffled audio samples output from the buffer locations; processing circuitry for compressing one of the two copies of the audio samples stored in memory; and loop-back circuitry for playing-back another one of the two copies of the audio samples stored in memory.