Patent ID: 7031905

Claim:
An audio signal encoding method comprising the steps of: quantizing first multiple-channel analog audio signals into corresponding first multiple-channel digital audio signals at a sampling frequency and a quantization bit number; implementing matrix operation among the first multiple-channel digital audio signals, to generate second multiple-channel audio signals correlating with each other; compressing the second multiple-channel audio signals into compression-resultant multiple-channel signals respectively, the compression-resultant multiple-channel signals relating to a smallest prediction-error lossless compression; and formatting the compression-resultant multiple-channel signals into a formatting-resultant signal of an audio pack including a pack header and a packet, the packet containing a packet header and an access unit composed of a sub packet and a sync information portion, the sub packet containing at least portions of the compression-resultant multiple-channel signals, the sync information portion containing the signal representative of the sampling frequency and the signal representative of the quantization bit number, where said access unit is of variable length and said compression-resultant multiple-channel signals are compressed with a variable bit rate.