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Method for quantizing one-step interpolation predicted vector of 1kb/s line spectral frequency parameter

A line spectrum frequency and vector quantization technology, applied in the field of one-step interpolation prediction vector quantization of 1kb/s line spectrum frequency parameters, can solve the problem of high bit rate of transparent quantization LSF parameters

Inactive Publication Date: 2003-05-28
BEIJING UNIV OF TECH
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Problems solved by technology

However, these methods require high bit rates for transparent quantization of LSF parameters, generally above 1kb / s

Method used

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  • Method for quantizing one-step interpolation predicted vector of 1kb/s line spectral frequency parameter
  • Method for quantizing one-step interpolation predicted vector of 1kb/s line spectral frequency parameter
  • Method for quantizing one-step interpolation predicted vector of 1kb/s line spectral frequency parameter

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Embodiment Construction

[0025] according to figure 1The method block diagram of the present invention shown, before carrying out the quantization of LSF parameter, at first, carry out linear predictive analysis to the input voice signal that removes DC component, frame length is 20 milliseconds, and window is Hamming window, and length is 240 sample points, The center of the window is located at the right boundary of the current frame, that is, the window covers 120 samples of the previous frame and 120 samples of the current frame; second, perform autocorrelation estimation on the windowed speech, and use Levinson- The Durbin recursive algorithm obtains the 10th-order LP coefficient; third, use 0.998 k , k=1,..., 10 multiplied by the LP coefficient to obtain the LP coefficient of 30HZ formant bandwidth broadening; finally, convert the LP coefficient into LSF parameters, and subtract the mean value to obtain the unbiased LSF parameter ω i (n) , i=1, 2, . . . , 10. The implementation process of the...

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Abstract

An one-step interpolation-predication method for quantifying the vectors of 1 kbps LSF parameters can be used in middle- or low-speed speech encoding and parametric speech synthesizing system. Its featureis that a vector quantifier of 1 kbps LSF parameters is designed by using one-step predication in frame and one-step interpolation between frames.

Description

technical field [0001] A one-step interpolation prediction vector quantization method for 1kb / s line spectrum frequency parameters belongs to speech signal processing and can be applied to medium and low rate speech coding and parametric speech synthesis systems. Background technique [0002] Efficient quantization of LP-Linear Prediction parameters representing vocal tract characteristics is a hot research topic in the field of speech signal processing. If you want to obtain high-quality synthetic speech, you must use efficient quantization techniques to quantize the LP coefficients, so that the average spectral distortion caused by the quantization of the LP coefficients is less than 1dB, so as to meet the requirements for LP coefficients in high-quality speech coding and speech synthesis systems. "Transparent quantification" requirements. So far, the LSF (LSF-LineSpectrum Frequencies) parameter is the most effective way to express the LP coefficients. At a relatively low...

Claims

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Application Information

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IPC IPC(8): G10L19/038
Inventor 鲍长春
Owner BEIJING UNIV OF TECH
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