Method and device for treatment after noise enhancement in broadband voice decoding

A speech decoding and noise technology, applied in the field of speech encoding and decoding, can solve problems such as methods or laws that are difficult to implement, do not give constant values, threshold values, etc.

Inactive Publication Date: 2013-03-13
SHENZHEN GUANGSHENG XINYUAN TECH
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Problems solved by technology

[0053] The noise enhancement processing method proposed above does not explain how to determine the series of constant values ​​and threshold values ​​used in it, nor does it give any method or law for determining constant values ​​and threshold values, so it is difficult to implement

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  • Method and device for treatment after noise enhancement in broadband voice decoding
  • Method and device for treatment after noise enhancement in broadband voice decoding
  • Method and device for treatment after noise enhancement in broadband voice decoding

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Embodiment Construction

[0127] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0128] figure 1 A wideband speech codec system 100 is shown. Such as figure 1 As shown, the speech signal is encoded into a series of parameters by the speech encoder 110 (including the source encoder 111 and the parameter encoder 112), and these parameters are transmitted to the decoder through the channel 120, and passed through the decoder 130 (including the parameter decoder 131 and the source The decoder 132) decodes and restores the synthesized speech signal.

[0129] The present invention is mainly embodied in the decoding end of the ACELP (Algebraic Code Excited Linear Prediction, Algebr...

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Abstract

The invention relates to a method and device for treatment after noise enhancement in broadband voice decoding. The method includes: S1, detecting voice/non-voice characteristics of a current frame, and calculating noise factors of the current frame; S2, determining whether the noise factors are larger than a preset threshold value; S3, when noise factors are larger than the preset threshold values, performing energy smoothing treatment on fixed code vectors of the current frame to obtain the fixed code vectors performed with energy smoothing; and S4, adding up self-adaption code vectors and the fixed code vectors performed with the energy smoothing treatment to compose excitation signals. The invention further relates to a method for wideband voice decoding and a decoder. The method and device performs smoothing treatment on energy of the fixed code vectors by means of the characteristics of decoding noise factors of voice signals, and accordingly, the aim of enhancing noises can be achieved. The method and device is applicable to various voice coders and decoders, algorithm complexity is low, and code transmission rate cannot be increased additionally.

Description

technical field [0001] The present invention relates to speech coding and decoding technology, more specifically, to a method and device for noise enhancement post-processing in wideband speech decoding. Background technique [0002] Speech coders / decoders are widely used in digital communication systems to efficiently send / store voice signals. In a digital system, the input analog voice signal is converted to the digital domain through sampling, and in the digital domain, the continuous voice samples are further processed. That is, the input of the speech coder is a speech sample, and the output is a compressed bit stream. The compressed bit stream is transmitted to the decoding end through the channel, and the speech decoder receives the bit stream and generates a reconstructed speech signal. [0003] In CELP (Code Excited Linear Prediction, Code Excited Linear Prediction) coding, digital voice signals are coded and transmitted in units of frames. For each frame of digi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/12
Inventor 张勇闫建新
Owner SHENZHEN GUANGSHENG XINYUAN TECH
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