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Self-adapting multi-speed narrowband coding method and coder

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

Inactive Publication Date: 2009-04-01
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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  • Self-adapting multi-speed narrowband coding method and coder
  • Self-adapting multi-speed narrowband coding method and coder
  • Self-adapting multi-speed narrowband coding method and coder

Examples

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Effect test

Embodiment 1

[0114] Embodiment 1, an Adaptive Multi-Rate Narrowband (AMR-NB) encoder that can be switched between a constant voice mode and a discontinuous transmission DTX mode, such as figure 1As shown, the 13-bit uniform pulse modulation (PCM) input sound signal frame 1 with a voice sampling rate of 8kHz is output to the non-background noise coding rate speech coding module and the background noise coding module at the same time, and the speech coding module outputs the non-background noise of signal frame 1 The adaptive multi-rate narrowband (AMR-NB) coded frame 11 of coding rate is exported to the coding frame output selection module, and the background noise coding module describes the adaptive multi-rate narrowband (AMR-NB) mute of the background noise coding rate of signal frame 1 The coded frame 12 is exported to the coded frame output selection module, and the voice coding module also outputs the synthesized digital voice signal frame 17 generated when the coded signal frame 1 is...

Embodiment 2

[0136] Example 2, such as Figure 4 Shown is an AMR-NB encoder that has only one encoding module to generate an AMR-NB encoded frame for an input voice signal frame, the input sound signal frame 42 is a 13-bit uniform PCM frame, 43 is a VAD sign, and 44 is an AMR-NB Coding voice frame (non-background noise coding rate adaptive narrowband coding frame), 45 is an AMR-NB silence description (SID) frame, 46 is an indication of the transmission type, 47 is an information bit passed to the 3G access network, and the voice coding module Frames 48 and 49 of the synthesized digital voice signal obtained by performing linear prediction and codebook search on the 13-bit uniform PCM frame are preprocessed sound signal frames obtained after preprocessing the 13-bit uniform PCM frame, and 50 is the background noise coding module Quantized energy prediction error for subframes generated when encoding background noise encoding rate - Silence Description (SID) frame - Quantized frame energy lo...

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Abstract

The invention provides an adaptive multi-rate encoder and a coding method. Compared with the prior art, the voice activity detection is changed greatly. Objects of the voice activity detection are correspondingly synthesized into digital speeches according to coding frames. And according to the changes, the adaptive multi-rate encoder and the coding method are updated in general frame. Thus, the synthesized sound signals of the decoder can accurately reflect the auditory effect of original sounds. The invention can be directly applied to the speech coding technology of a third generation mobile communication system, namely the universal mobile telecommunication system.

Description

technical field [0001] The invention relates to an adaptive multi-rate narrowband encoder and its encoding method, in particular to the technology of voice activation detection of the adaptive multi-rate narrowband encoder and AMR-NB 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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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/08G10L19/12G10L19/14G10L11/02G10L19/24
Inventor 向为
Owner 向为
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