Speech/audio signal processing method and apparatus

A speech/audio signal processing method, comprising:

• obtaining, by a decoder, an initial high frequency time-domain signal corresponding to a current frame of a speech/audio signal when a signal of the current frame is a narrow frequency signal and a signal of a previous frame is a wide frequency signal, wherein the previous frame is adjacent to the current frame;
• obtaining, by the decoder, a time-domain global gam parameter of the initial high frequency time-domain signal according to a spectrum tilt parameter of the current frame of the speech/audio signal and a correlation between the narrow frequency signal of the current frame and a narrow frequency signal of the previous frame;
• performing, by the decoder, weighting processing on an energy ratio and the time-domain global gain parameter to obtain a weighted value as a predicted global gain parameter, wherein the energy ratio is a ratio between energy of a high frequency time-domain signal of the previous frame and energy of the initial high frequency time-domain signal of the current frame;
• correcting, by the decoder, the initial high frequency time-domain signal by using the predicted global gain parameter to obtain a corrected high frequency time-domain signal;
• synthesizing, by the decoder, a synthesized signal by a narrow frequency time-domain signal of the current frame and the corrected high frequency time-domain signal;
• and
• outputting, by the decoder, the synthesized signal.