Method for encoding 2.3kb/s harmonic wave excidted linear prediction speech

A linear prediction and speech coding technology, used in speech analysis, instruments, etc., can solve the problems of natural decline of synthesized speech, pitch-shift distortion, etc., and achieve the effect of natural and smooth synthesized speech quality

Inactive Publication Date: 2003-06-18
BEIJING UNIV OF TECH
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Problems solved by technology

This will produce serious pitch distortion for toned Chinese speech,

Method used

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  • Method for encoding 2.3kb/s harmonic wave excidted linear prediction speech
  • Method for encoding 2.3kb/s harmonic wave excidted linear prediction speech

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[0043] specific implementation plan

[0044] according to figure 1 The functional block diagram of the technical solution of the present invention provided. The input speech is a linear PCM signal sampled at 8kHz. The analysis frame length of the speech signal is 20ms, that is, the frame rate is 50Hz. In addition, an additional delay of one frame is added for linear prediction analysis and pitch detection. In the present invention, there are 5 parameters that need to be quantized and coded, and they are pitch period, voicing degree, first 10 normalized linear prediction residual harmonic amplitudes, normalized gain and line spectrum frequency parameters. The quantization bit number allocation of these parameters is shown in Table 1. The present invention is accomplished using the aforementioned encoding and decoding methods.

[0045] Experimental effect of the present invention is as follows:

[0046] To evaluate the performance of the 2.3kb / s HE-LPC speech encoding meth...

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Abstract

A 2.3 kb/s speech coding technique with harmonic excitation and linear prediction is disclosed. The speech signals are acquired by speech acquisition system and then inputted to the processor of computer. The fundational tone detecting method and voiced sound analysis method are used to split the LPC exciting signal into lower band associated with voised sound and higher band relative to voiceless sound. A united harmonic model with a fixed phase spectrum of voiced sound of man speech is used to express the harmonic component and pseudo-noise component. An interpolation method is used to reduce noise. A short-lag filter is used for high quality of synthetic speech.

Description

technical field [0001] The technical field of the 2.3kb / s harmonic excitation linear predictive speech coding method is speech signal processing, and its application scope covers the following two aspects: first, digital transmission of speech signals, such as digital communication systems, mobile radios, cellular phones and security Telephone system, etc.; Second, digital storage of voice signals, such as digital recording telephone, voice mail, voice mailbox, electronic message book, voice dictionary, multimedia query system and various electronic voice toys. technical background [0002] With the rapid development of information society and communication technology, frequency resources are becoming more and more precious. Therefore, compressing the transmission bandwidth of speech signals or reducing the transmission code rate of telephone channels has always been the goal pursued by people, and speech coding plays an important role in realizing this goal. Speech coding ...

Claims

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Application Information

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IPC IPC(8): G10L19/04
Inventor 鲍长春
Owner BEIJING UNIV OF TECH
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