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Method, device and system for realizing unchanged voice coding based on GSM EFR

A technology of speech coding and speech, which is applied in the field of speech coding and can solve problems such as large distortion and coding distortion

Pending Publication Date: 2022-04-12
南京西觉硕信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the encoded and decoded synthesized speech signal is encoded twice, there will be a problem of encoding distortion, that is, the parameters of the second encoding and the parameters of the first encoding will be greatly distorted.

Method used

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  • Method, device and system for realizing unchanged voice coding based on GSM EFR
  • Method, device and system for realizing unchanged voice coding based on GSM EFR
  • Method, device and system for realizing unchanged voice coding based on GSM EFR

Examples

Experimental program
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Effect test

Embodiment 1

[0061] A complete speech frame includes four subframes, respectively called: the first subframe, the second subframe, the third subframe and the fourth subframe to the fourth, wherein the first subframe and the second subframe form the first half frame , the third subframe and the fourth subframe form the second half frame.

[0062] The present invention provides a kind of method based on GSM_EFR realizing speech coding invariance, specifically comprises the following steps:

[0063] Step (1), obtaining a given second subframe LPC quantization parameter; LPC (linear predictive coding) refers to linear predictive coding; in the specific implementation process, the acquisition method of the given second subframe LPC quantization parameter is specific is: according to encryption requirements, the encrypted bit information is mapped to the second subframe LPC quantization parameter according to the mapping rule of bit information to quantized LPC, thereby forming a given second su...

Embodiment 2

[0109] Based on the same inventive concept as in Embodiment 1, an embodiment of the present invention provides a device for implementing voice coding invariance based on GSM_EFR, including:

[0110] An acquisition module, configured to acquire a given second subframe LPC quantization parameter;

[0111] The initialization module is used to initialize the voice of the second half of the frame;

[0112] Calculation module, used to form a complete speech frame with the synthesized speech of the first half frame of this frame and the speech of the second half frame of this frame, and obtain the LPC quantization parameter of the second subframe and the LPC quantization parameter of the fourth subframe;

[0113] An iterative module, configured to add the obtained second and fourth subframe LPC quantization parameters to the LPC quantization parameter set if the obtained second subframe LPC quantization parameter is different from the given second subframe LPC quantization parameter,...

Embodiment 3

[0133] An embodiment of the present invention provides a system based on GSM_EFR to realize speech coding invariance, including a storage medium and a processor;

[0134] The storage medium is used to store instructions;

[0135] The processor is configured to operate according to the instructions to execute the method according to any one of Embodiment 1.

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Abstract

The invention discloses a method, a device and a system for realizing voice coding invariability based on GSM EFR. The method comprises the following steps: acquiring a given second subframe LPC quantization parameter; initializing the last half frame of voice of the current frame; forming a complete voice frame by the synthetic voice of the first half frame of the current frame and the voice of the second half frame of the current frame, and obtaining a second subframe LPC quantization parameter and a fourth subframe LPC quantization parameter; and if the obtained second subframe LPC quantization parameter is different from the given second subframe LPC quantization parameter, adding the obtained second and fourth subframe LPC quantization parameters into an LPC quantization parameter set, optimizing the last half frame voice of the current frame in an iteration mode until the obtained second subframe LPC quantization parameter is the same as the given second subframe LPC quantization parameter, and in the iteration process, optimizing the second subframe LPC quantization parameter and the given second subframe LPC quantization parameter. The residual error of all the LPC quantization parameters in the LPC quantization parameter set is required to be greater than the LPC quantization parameter residual error given by the corresponding frame. According to the invention, the voice information of the low-rate voice coding can be hidden on the LPC quantization parameter of the second subframe, the voice encryption effect of the low-rate voice coding is improved, and voice secret communication is realized.

Description

technical field [0001] The invention belongs to the technical field of speech coding, and in particular relates to a method, device and system for realizing constant speech coding based on GSM_EFR. Background technique [0002] Although parametric speech coding can effectively reduce the coding rate and obtain better speech quality, it pays attention to the restoration of speech auditory quality, and the synthesized speech signal after encoding and decoding is greatly different from the original input speech signal. If the encoded and decoded synthesized speech signal is encoded twice, there will be a problem of encoding distortion, that is, the parameters of the second encoding and the parameters of the first encoding are greatly distorted. Contents of the invention [0003] In view of the above-mentioned problems, the present invention proposes a method, device and system based on GSM_EFR to realize speech coding invariance, which can realize that the sending end hides t...

Claims

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Application Information

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IPC IPC(8): G10L19/087G10L19/00G10L19/018H04L9/40
Inventor 张亦农汤一彬裴鹏
Owner 南京西觉硕信息科技有限公司
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