Method for refining parameter of narrow band vocoder on decoding end
A vocoder and parameter technology, which is applied in the field of narrow-band vocoder parameter refinement at the decoding end, can solve the problem that the quantization efficiency of each parameter cannot be further improved.
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[0034] The narrowband parameter quantization method that the present invention proposes is further described as follows in conjunction with accompanying drawing and embodiment:
[0035] The flow of the method for refining the parameters of the narrowband vocoder at the decoding end according to the present invention is as follows: figure 2 shown, including the following steps:
[0036] (1) The encoding end divides the input speech signal samples into frames in time order;
[0037] (2) Extract channel parameters by frame , pitch parameters , energy parameter , sub-band unvoicing parameters and the residual spectral magnitude parameter ;
[0038] (3) Sequentially combine multiple speech frames to form a superframe, and the above parameters of multiple speech frames respectively form the corresponding parameters of the superframe, that is, the channel parameters of the superframe , pitch parameter , energy parameter , subband voiceless and the residual spectra...
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