Encoding method and encoding apparatus for stereo signal

Abstract

Provided are an encoding method and encoding apparatus for a stereo signal. The method comprises determining a window length of an attenuating window of a current frame according to an inter-channel time difference of the current frame; determining a corrected linear prediction analysis window according to the window length of the attenuating window of the current frame, wherein values of at leastsome of the points between an (L sub_window_len)th point and an (L 1)th point in the corrected linear prediction analysis window are lower than values of corresponding points between the (L sub_window_len)th point and the (L 1)th point in an initial linear prediction analysis window, sub_window_len is the window length of the attenuating window of the current frame, L is a window length of the corrected linear prediction analysis window, and the window length of the corrected linear prediction analysis window is equal to the window length of a linear prediction analysis window of the currentframe; and performing linear prediction analysis on a channel signal to be processed according to the corrected linear prediction analysis window. The accuracy of linear prediction can be improved.

Description

technical field [0001] The present application relates to the technical field of audio signal coding and decoding, and more specifically, relates to a stereo signal coding method and coding device. Background technique [0002] The general process of encoding stereo signals using time-domain stereo coding technology is as follows: [0003] Estimate the time difference between channels for stereo signals; [0004] Perform delay alignment processing on the stereo signal according to the time difference between channels; [0005] Perform time-domain down-mixing processing on the time-delay-aligned signal according to the parameters of the time-domain down-mixing process, to obtain a main channel signal and a secondary channel signal; [0006] The time difference between channels, the parameters of time-domain downmix processing, the main channel signal and the secondary channel signal are encoded to obtain an encoded code stream. [0007] Wherein, when performing time delay ...

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Problems solved by technology

[0008] However, since part of the signal of the target channel is artificially determined (including the transition signal and the forward signal), the artificially determined part of the signal is quite different from the real signal, therefore, it may lead to the use of a monophonic encoding algorithm There is a certain difference between the linear prediction coefficient and the real linear prediction coefficient obtained when performing linear prediction analysis on the main channel signal and the secondary channel signal determined according to the stereo signal processed by time delay alignment, which affects the coding quality

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