Noise signal processing and generation method, encoder/decoder and encoding/decoding system

Abstract

A linear prediction-based noise signal processing method and generation method, an encoder / decoder and an encoding / decoding system. The noise signal processing method comprises: acquiring a noise signal, and obtaining a linear prediction coefficient according to the noise signal (S51); filtering the noise signal according to the linear prediction coefficient to obtain a linear prediction residual signal (S52); obtaining a frequency spectrum envelope of the linear prediction residual signal according to the linear prediction residual signal; and encoding the frequency spectrum envelope of the linear prediction residual signal. According to the noise signal processing and generation method, encoder / decoder and encoding / decoding system, more frequency spectrum details of an original background noise can be recovered, so that the subjective sense of hearing of a user of a comfort noise can feel closer to the original background noise, thereby improving the quality of the user's subjective feeling.

Description

technical field [0001] The invention relates to the field of audio signal processing, in particular to a method for processing and generating noise signals, a codec and a codec system. Background technique [0002] Only about 40% of the time in voice communication contains speech, and the rest of the time is silence or background noise (hereinafter collectively referred to as background noise). In order to save the transmission bandwidth of background noise, Discontinuous Transmission System (DTX, Discontinuous Transmission) and Comfort Noise Generation (CNG, Comfort Noise Generation) technologies came into being. [0003] DTX means that the encoder encodes and transmits audio signals intermittently during background noise according to a certain strategy, instead of continuously encoding and transmitting each frame of audio signals. Such frames that are encoded and sent intermittently are generally called Silence Insertion Descriptor frames (SID, Silence Insertion Descripto...

AI Technical Summary

Problems solved by technology

[0006] The method of using the comfort noise generated by the random noise sequence as the excitation signal can obtain more comfortable noise and roughly restore the spectral envelope of the original background noise, but it also leads to the loss of the spectral details of the original background noise. , so that the subjective auditory experience of the generated comfort noise still has a certain difference compared with the original background noise

This difference may cause the user's subjective hearing discomfort when transitioning from a continuously encoded speech segment to a comfort noise segment

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