Decoding method and decoding device

A decoding method and decoding unit technology, which are applied in speech analysis, instruments, coupling substation interface circuits, etc., can solve problems such as the inability to guarantee the quality of encoded signals, and achieve the effects of accurate encoding and reduced communication bandwidth.

Active Publication Date: 2010-02-17
HUAWEI TECH CO LTD
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Problems solved by technology

[0010] There are at least the following problems in the prior art: because the bandwidth of the existing G.729B system is narrow-band background noise, when it is transplanted into the G.729.1 system, The quality of the encoded signal cannot be guaranteed

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Embodiment 1

[0133] refer to Figure 4 As shown, it is Embodiment 1 of the encoding method of the present invention, comprising steps:

[0134] Step 401, extracting the characteristic parameters of the background noise within the smear time;

[0135] Step 402: For the first superframe after the hangover time, perform background noise coding according to the extracted background noise characteristic parameters in the hangover time period and the background noise characteristic parameters in the first superframe, Get the first SID frame;

[0136] Step 403, for the superframe after the first superframe, perform background noise feature parameter extraction and DTX judgment for each frame;

[0137] Step 404, for the superframe after the first superframe, according to the background noise characteristic parameter of the extracted current superframe and the background noise characteristic parameter of several superframes before the current superframe, and the final DTX decision result, perform...

Embodiment 2

[0146] Since the encoding frame lengths of G729.1 and G729B are different, the former is 20ms per frame, and the latter is 10ms per frame. That is to say, one frame of G729.1 corresponds to the length of two frames of G729B. For convenience of description, here a frame of G729.1 is superframe (superframe), and a frame of G729B is frame (frame), the present invention mainly describes the DTX / CNG system of G729.1 for this difference, namely by The G729B DTX / CNG system is upgraded and expanded to adapt to the system characteristics of ITU729.1.

[0147] 1. Noise learning:

[0148] First, encode the first 120ms of background noise with the speech encoding rate;

[0149] In order to accurately extract the characteristic parameters of the background noise, it does not enter the background noise immediately after the end of the speech frame (according to the indication of the VAD result, indicating that the current frame has changed from active speech to inactive background noise)....

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Abstract

The embodiment of the invention discloses a decoding method which comprises the following steps: acquiring CNG parameters of a first frame of a first superframe from a speech coding frame at the frontof the first frame of the first superframe; carrying out background noise decoding to the first frame of the first superframe according to the CNG parameters, wherein the CNG parameters comprise target excitation gains and LPC filter coefficients, wherein the target excitation gains are determined by fixed codebook gains quantized by the long-term and smooth speech coding frame, and the LPC filter coefficients are defined by LPC filter coefficients quantized by the long-term and smooth speech coding frame. The invention also discloses a decoding device. By utilizing the embodiment, the occupied bandwidth can be remarkably reduced under the condition of ensuring the signal quality.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a decoding method and device. Background technique [0002] In voice communication, the coding and decoding of background noise is carried out according to the noise processing scheme stipulated in G.729B formulated by ITU (International Telecom Union, International Telecommunication Union). [0003] The silence compression technology is introduced in the speech coder, and its signal processing principle block diagram is as follows figure 1 shown. [0004] Silence compression technology mainly includes three modules: VAD (Voice Activity Detection, voice activation detection), DTX (Discontinuous Transmission, discontinuous transmission) and CNG (ComfortNoise Generator, comfort noise generation), where VAD and DTX are modules in the encoder , CNG is a module in the decoding end. figure 1 It is a simple block diagram of the silent compression system, and its basic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M1/74G10L19/00
Inventor 艾雅·舒默特张立斌代金良
Owner HUAWEI TECH CO LTD
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