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.
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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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