Noise generating apparatus and method

Abstract

The invention discloses a noise generation method which includes the following steps: according to a noise parameter obtained beforehand, an initial value of a reconstruction parameter is obtained; according to the initial value of the reconstruction parameter, random value-taking scope is obtained; in the random value-taking scope, a value is picked by random as a reconstructed noise parameter; according to the reconstructed noise parameter, noise is obtained. The invention also discloses a noise generation device which comprises: an initial value unit used for obtaining the initial value of the reconstruction parameter according to the noise parameter obtained beforehand; a scope unit used for obtaining random value-taking scope according to the initial value of the reconstruction parameter; a reconstruction unit used for picking value by random as a reconstructed noise parameter in the random value-taking scope; an integration unit used for combing noise according to the reconstructed noise parameter. The method can be applicable to various standard protocols and cause that more comfortable noise can be decoded for a user in a decoding end.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a noise generating device and method. Background technique [0002] In the process of voice transmission, voice coding technology is usually used to compress the voice information to increase the capacity of the communication system. [0003] Since only about 40% of the time in voice communication contains voice, the rest of the time is silence or background noise, and people who usually carry out voice communication care about the content of the voice, and only the time of silence or background noise Therefore, when compressing voice information, different methods will be used to encode and transmit voice, silence or background noise, so as to further increase the capacity of the communication system. Discontinuous Transmission System / Comfortable Noise Generation (DTX / CNG, Discontinuous Transmission System / Comfortable Noise Generation) is such a technology for fu...

AI Technical Summary

Problems solved by technology

[0015] 3GPP's voice coding standard - DTX / CNG technology used in AMR, only for the situation where the encoding end sends SID frames at fixed intervals. When the encoding end uses adaptive intervals to send SID frames, it will not work properly

[0016] The DTX / CNG technology used in the silence compression scheme defined by ITU's speech coding standard - conjugate structure algebraic codebook excitation linear predictive vocoder, when the current frame is SID, uses the decoded spectral parameters and the previous SID frame The spectral parameters of the first subframe of the current frame are averaged, and the spectral parameters of the second subframe are directly used to decode the spectral parameters; the silent frame between the arrival of the next SID frame is directly decoded by the latest SID frame. The spectral parameters of the reconstruction noise, when the next SID frame arrives and the decoded spectral parameters are different from the spectral parameters of the previous SID frame, discontinuity will appear, and because the spectral parameter is a constantly changing quantity, Therefore, the two spectral parameters before and after are usually different, so the spectrum of the reconstructed comfort noise is prone to discontinuity, which in turn affects the quality of hearing, especially when the two spectral parameters before and after are quite different.

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