Patent ID: 7733973
Filing Date: 2010-06-08
Classification: G10L

Abstract:
1. A multichannel signal coding apparatus comprising: a coding determining section which determines for each time-period, hereinafter refereed to as a frame, of an input signal of each channel, the input signal being hereinafter referred to as a channel signal, which of a coding operation on the channel signal itself, the coding operation being hereinafter referred to as independent coding operation, and a coding operation on a weighted difference between the channel signal and a channel signal of another channel, hereinafter referred to as parent, the coding operation being hereinafter referred to as difference coding operation; waveform coding section which codes a signal to be coded for each channel using the determined coding operation to generate a code string; a combiner which generates a multichannel code including information as to which of the independent coding operation and difference coding operation is to be performed for each channel, weighting information in the case of the difference coding, and the code string; a repetition control section which generates a signal of each channel to be coded from a channel signal of the channel in accordance with the coding operation determined at the coding determining section and controls the step of repeating the coding determining section at least once by using the generated signal to be coded as the channel signal of the channel; the coding determining section which determines that the independent coding is to be performed on a channel signal of at least one channel and determines that the difference coding operation is to be performed on a channel signal of another channel; and the waveform coding section which codes the signal of each channel to be coded obtained at the last repeating step by using the coding operation determined at the last determining step to obtain a code string.