Background noise excitation signal generating method and apparatus

Abstract

The invention relates to a generating method and device for a background noise excitation signal, and the method comprises: excitation signals bound are generated by using the coding parameters in the phase of voice coding and decoding and the transitional length of the excitation signals; the excitation signals bound and the random excitation signals of the background noise coding frame are carried out weighted sum, and the excitation signals of the background noise in the transitional phase are obtained. Meanwhile, the device comprises: an excitation signals bound generation unit and a unit for obtaining excitation signals in the transitional phase. After the scheme of the synthesis of the comfortable background noise of the invention is adopted, when the synthesis signals are transferred from the voice to the background noise, the transition is more natural, smooth and continuous, and the feelings of ears of the hearers are more comfortable.

Description

technical field

[0001] The present invention relates to the communication field, in particular to a method and device for generating background noise excitation signals. Background technique

[0002] In voice communication, the voice processing is mainly done by the voice codec. Because the voice signal has short-term stability, the voice codec generally processes the voice signal by frame, and each frame is 10-30ms. The initial speech codecs are all fixed-rate, that is, each speech codec has only a fixed coding rate, such as the coding rate of the speech codec G.729 is 8kbit / s, and the rate of G.728 is 16kbit / s. These traditional fixed-rate speech codecs generally speaking, the encoding algorithm of higher rate can guarantee the encoding quality more easily, but occupies larger communication channel resources; The encoding algorithm of lower rate occupies less communication channel resources, but It is not easy to guarantee the encoding quality.

[0003] Speech signals ...

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