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Method for refining parameter of narrow band vocoder on decoding end

A vocoder and parameter technology, which is applied in the field of narrowband vocoder parameter refinement at the decoding end, can solve the problem that the quantization efficiency of each parameter cannot be further improved

Active Publication Date: 2013-01-30
SHANDONG COMP SCI CENTNAT SUPERCOMP CENT IN JINAN
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Problems solved by technology

According to Shannon's theory, the existence of correlation can further improve the quantization efficiency and reconstruction accuracy, but the existing technology does not fully consider or utilize this correlation, so that the quantification efficiency of each parameter cannot be further improved

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  • Method for refining parameter of narrow band vocoder on decoding end
  • Method for refining parameter of narrow band vocoder on decoding end
  • Method for refining parameter of narrow band vocoder on decoding end

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Embodiment Construction

[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 parameter , energy parameters , 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 parameters , subband voiceless and the residual spectr...

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Abstract

The invention discloses a method refining a parameter of a narrow band vocoder on a decoding end. Based on the coherence of an excitation parameter and a sound track parameter, all parameters are more fine reconstructed on the decoding end, thus the quantization precision is improved, and the quality of synthetic speech sound is further improved. More particularly, for encoding and decoding parameters in a narrow band low-rate speed coding based on a hybrid excitation linear prediction model, a method based on mapping and refining among different parameters is adopted. Various encoding and decoding parameters are quantized by adopting an independent vector through an original technology. According to the invention, the coherence between the excitation parameter and the sound track parameter is considered, and various inverse-quantized encoding and decoding parameters are refined by adopting a nonlinear mapping method, thus the quantization efficiency of various parameters is increased, and the quality of the synthetic speech sound is improved. According to the method, the natural degree of the synthetic speech sound can be improved.

Description

technical field [0001] The invention belongs to the technical field of parameter speech coding, and in particular relates to a method for refining parameters of a narrowband vocoder at a decoding end. Background technique [0002] Speech coding is widely used in communication systems, voice storage and playback systems, and consumer products with voice functions. In recent years, the International Telecommunication Union (ITU), some regional organizations and some countries have successively formulated a series of speech compression coding standards. The speech coding methods can be divided into waveform coding, parametric coding and hybrid coding from the perspective of coding methods. When the encoding rate drops below 4kbps, the parameter encoding model is mostly used. [0003] Low-rate speech coding technology based on parametric coding model is still a research hotspot in the field of speech signal processing, mainly used in wireless communication, secure communication...

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Application Information

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IPC IPC(8): G10L19/032G10L13/08
Inventor 李晔马晓凤樊燕红姜竞赛郝秋赟
Owner SHANDONG COMP SCI CENTNAT SUPERCOMP CENT IN JINAN
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