Stereo signal encoding method and encoding apparatus

An encoding apparatus, comprising:

• at least one processor;
• and
• one or more memories coupled to the at least one processor and configured to store programming instructions for execution by the at least one processor to cause the encoding apparatus to:
• obtain an inter-channel time difference (ITD) of a current frame of a stereo signal;
• obtain a first window length of an attenuation window of the current frame based on the ITD;
• obtain a modified linear prediction analysis window based on the first window length, wherein values of at least some points from a first point (L−sub_window_len) in the modified linear prediction analysis window to a second point (L−1) in the modified linear prediction analysis window are less than values of corresponding points from a third point (L−sub_window_len) in an initial linear prediction analysis window to a fourth point (L−1) in the initial linear prediction analysis window, wherein sub_window_len represents the first window length, wherein L represents a second window length of the modified linear prediction analysis window, and wherein the second window length corresponds to a third window length of the initial linear prediction analysis window;
• and
• perform linear prediction analysis on a channel signal of the stereo signal based on the modified linear prediction analysis window.