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

Abstract

A multichannel acoustic signal encoding method, decoding method and device, the encoding method comprising: employing a modified discrete cosine transform (MDCT) or a modified discrete sine transform (MDST) to map a first multichannel acoustic signal as a first frequency domain signal (101); dividing the first frequency domain 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 a principal component analysis (PCA) mapping model according to the first statistical characteristic (104); employing the PCA mapping model to map the first multichannel acoustic signal as a second multichannel acoustic signal (105); and according to differences in time, frequency and channel, conducting perceptual encoding on the PCA mapping model and at least one group in the second multichannel acoustic signal to obtain an encoding multichannel code stream (106). Thus, the encoding method employs an MDCT or an MDST to conduct time frequency mapping, estimates the mapping model according to the statistical characteristic, and selects the specific PCA mapping model, thus realizing a higher encoding efficiency and encoding quality.

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. Commonly used sound coding technologies include Dolby Laboratories' AC-3, Digital Cinema Systems' DTS, and 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 th...

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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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