US 7,733,973 B2Granted

Multichannel signal encoding method, its decoding method, devices for these, program, and its recording medium

AssigneesThe University of Tokyo, Nippon Telegraph and Telephone Corporation

InventorsTakehiro Moriya, Noboru Harada, Yutaka Kamamoto, Takuya Nishimoto, Shigeki Sagayama

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Abstract

An object of the present invention is to efficiently perform weighted difference coding of two or more signals. Determination is made as to which of independent coding and weighted difference coding is to be used for each channel so that the total energy of the channel signals and weighted difference signals is minimized. A weighted difference signal is generated on the basis of the determination and a reference signal (parent) and a weight is generated as auxiliary codes, the difference signal is treated as an input channel signal, and the process of coding determination and difference signal and auxiliary code generation is repeated. The difference signal generated at the last iteration of the process and a signal to be coded by independent coding are compressive coded and the auxiliary codes generated at the iterations of the process are coded and outputted.

Claims8

Dependent claims

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.

4 more elements

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 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;
a 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 and, weighting information in the case of the difference coding, and the code string;
wherein the coding determining section comprises serial processing means for determining that the independent coding operation is to be performed on one channel and determining that the difference coding is to be performed on the difference between another channel and a channel signal of the channel for which it has been determined that the independent coding operation is to be performed;
and
repeating, for each channel for which a coding operation to be performed is yet to be determined, the step of determining which of the independent coding operation and the difference coding operation with one of the channels for which a coding operation to be performed has already been determined is to be performed until coding operations to be performed are determined for all channels.

3 more elements

Dependencies are inferred from the claim text.