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AMR-WB coding method and encoder

An adaptive codebook and coding technology, applied in instruments, speech analysis, etc., to solve problems such as voice quality degradation

Inactive Publication Date: 2009-02-04
向为
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the frequent use of the Silence Description (SID) frame will bring about the improvement of the utilization rate of wireless resources, but it will also bring about the decline of voice quality.

Method used

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  • AMR-WB coding method and encoder

Examples

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Effect test

Embodiment 1

[0105] Embodiment 1, an Adaptive Multi-Rate Wideband (AMR-WB) encoder that can transmit DTX discontinuously, such as figure 1As shown, the 14-bit uniform pulse modulation (PCM) input sound signal frame 1 of the voice sampling rate of 16kHz is output to the speech coding module and the background noise coding module of the non-background noise coding rate simultaneously, and the speech coding module outputs the non-background noise of the signal frame 1 The adaptive multi-rate wideband (AMR-WB) encoded frame 11 of the noise coding rate is output to the coded frame output selection module, and the background noise coding module mutes the adaptive multi-rate wideband (AMR-WB) of the background noise coding rate of the signal frame 1 Describe that the coded frame 12 is output to the coded frame output selection module, and the voice coded module also outputs the synthesized digital voice signal frame 17 generated when the coded signal frame 1 is generated to the voice activation d...

Embodiment 2

[0112] Example 2, such as image 3 Shown, one has only one encoding module to produce the AMR-WB coder of AMR-WB coded frame for it to an input voice signal frame, input voice signal frame 42 is 14 bit even PCM frames, 43 is VAD mark, 44 is AMR-WB WB coded speech frame (non-background noise coding rate adaptive wideband coded frame), 45 is AMR-WB silence description (SID) frame, 46 is the indication of sending type, 47 is the information bit transmitted to 3G access network, speech coding Synthesized digital speech signal frames 48 and 49 obtained by the module performing linear prediction and codebook search on the 14-bit uniform PCM frame are preprocessed speech signal frames obtained after preprocessing the 14-bit uniform PCM frame.

[0113] image 3 and 3 GPP26.071-400 figure 1 A block diagram on the right side of the sending part (Transmit side) described in is similar, and the difference is: the present invention Figure 4 The voice activation detection module in th...

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Abstract

The invention provides a new self-adapting multi-speed coder and a coding method. Compared with prior art, the voice activation detection is largely changed in that the voice activation detection is aimed at the synthesized digital sound corresponding to the coding frame, and the overall framework of the self-adapting multi-speed coder and the coding method is renewed, so the sound signal synthesized by the coder can accurately reflect the audio effect of the original sound. The invention can be directly applied to voice encryption technique of the third generation of mobile communication system-Universal Mobile Telecommunication System.

Description

technical field [0001] The invention relates to an adaptive multi-rate wideband encoder and a coding method thereof, in particular to the technology of voice activation detection of the adaptive multi-rate wideband encoder and AMR-WB encoding for continuous sound signal frames. Background technique [0002] Code-excited linear predictive encoders have been widely used since they were proposed in 1985. The code-excited linear predictive coder technique is used in code division multiple access (CDMA) and universal mobile telecommunications system (UMTS) vocoders. [0003] Code-excited linear prediction includes linear prediction and quantization, adaptive codebook search and fixed codebook search. Because speech itself has silent periods, the transmission rate of speech data can be effectively compressed by reducing the data rate during these silent periods. Qualcomm's patent application number 92104618.9 for a variable-rate vocoder is a solution to the above-mentioned method...

Claims

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Application Information

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IPC IPC(8): G10L19/08G10L19/12G10L19/14G10L11/02G10L19/24
Inventor 向为
Owner 向为
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