Multichannel signal encoding method, device and system as well as multichannel signal decoding method, device and system

Abstract

The embodiment of the invention discloses a multichannel signal encoding method, device and system as well as a multichannel signal decoding method, device and system, wherein the multichannel signal encoding method comprises the following step of: carrying out quantification processing on CLD (Channel Level Difference) coefficients of current intra-frame frequency bands with same index number classes. The embodiment of the invention prevents the CLD coefficients of all current intra-frame frequency bands from being subjected to the quantification processing, thereby reducing the current intra-frame data quantity participating in quantification and the complexity of quantified CLD coefficients and enhancing the efficiency of quantified CLD coefficients.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of audio processing, and in particular, to a multi-channel signal encoding and decoding method, device, and encoding and decoding system. Background technique [0002] With the improvement of people's living standards, digital technology continues to develop into audio-visual products, and high-quality audio products have gradually entered ordinary families. Multi-channel speakers have higher quality sound effects. Channel level difference (CLD coefficient, Channel Level Difference) is an important parameter that expresses the sound field of a multi-channel signal. It reflects the energy relationship in each frequency band of the two signals of the multi-channel signal. It is widely used In existing multi-channel signal coding algorithms, for example: intensity multi-channel signal, parametric multi-channel signal, Panning algorithm, etc. [0003] The CLD coefficients need a scalar qu...

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Problems solved by technology

[0006] The encoding terminal in the prior art quantizes the CLD coefficients on all frequency bands of the stereo speech signal, and the CLD coefficient reflects the change of the sound field. Generally, the sound field of the stereo speech signal recorded naturally does not change quickly, so the stereo speech signal The CLD coefficients in the frames before and after the change are small or even unchanged. Therefore, the processing method of the CLD coefficients in the prior art increases the complexity of quantizing the CLD coefficients and reduces the efficiency of quantizing the CLD coefficients.

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