Multi-channel audio signal encoding method, decoding method and device

Abstract

A multichannel acoustic signal encoding method, decoding method and device for self-adaptively selecting a mapping model in encoding to realize a higher encoding efficiency and encoding quality, the encoding method comprising: employing time frequency conversion to map a first multichannel acoustic signal as a first frequency domain signal, or employing a sub-band filter to map the first multichannel acoustic signal as a first sub-band signal (101); dividing the first frequency domain signal or the first sub-band signal into different time frequency sub-bands (102); calculating a first statistical characteristic of the first multichannel acoustic signal in each time frequency sub-band (103); estimating an optimized sub-space mapping model according to the first statistical characteristic (104); employing the optimized sub-space mapping model to map the first multichannel acoustic signal as a second multichannel acoustic signal (105); and according to time, frequency and channel, conducting perceptual encoding on the optimized sub-space mapping model and at least one group in the second multichannel acoustic signal to obtain an encoding multichannel code stream (106).

Description

technical field [0001] The invention relates to the technical field of audio processing, in particular to a multi-channel sound signal encoding method, decoding method and device. Background technique [0002] With the development of science and technology, a variety of coding technologies for sound signals have emerged. The above-mentioned sounds usually refer to digital sounds including signals perceivable by human ears such as voice, music, natural sounds, and artificially synthesized sounds. At present, many sound coding technologies have become industrial standards and have been widely used and integrated into people's daily life. The commonly used sound coding technologies include Dolby Laboratories' AC-3, Digital Cinema Systems' DTS, Moving Picture Experts Group (MPEG ) organization's MP3 and AAC, Microsoft's WMA, and Sony's ATRAC. [0003] In order to reproduce the stereophonic sound effect, multi-channel sound signals are played to users by multiple channels, and t...

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Problems solved by technology

[0007] The present invention provides a multi-channel audio signal encoding method, decoding method and device, the purpose of which is to solve the existing statistical redundancy in the multi-channel audio signal encoding method in the prior art, which cannot take into account both the encoding efficiency and the quality of the encoded signal The problem

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