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Keynote searching method and device thereof

A search method and pitch technology, applied in the field of speech codec

Active Publication Date: 2011-06-08
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the previous frame contained unvoiced or silent speech, the weighting function will be attenuated by the parameter v

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  • Keynote searching method and device thereof
  • Keynote searching method and device thereof

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Embodiment Construction

[0043] The technical solutions of the embodiments of the present invention will be described in further detail below with reference to the drawings and embodiments.

[0044] like figure 1 As shown, it is a flow chart of Embodiment 1 of a pitch search method provided by the present invention, which specifically includes the following steps:

[0045] Step 101. Obtain the eigenfunction value of the residual signal, which is obtained by removing the long-term prediction contribution signal from the input speech signal;

[0046] Step 102. Obtain the pitch according to the characteristic function value of the residual signal.

[0047] In this embodiment, the characteristic function value of the residual signal is obtained, and the pitch is obtained according to the characteristic function value of the residual signal, without calculating the correlation function value of the entire frame input speech signal.

[0048] like figure 2 As shown, it is a flow chart of Embodiment 2 of ...

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Abstract

The embodiment of the invention relates to keynote searching methods and a device thereof. One of the methods comprises the following steps: the characteristic function values of residual signals are obtained, the residual signals are obtained by removing long-time prediction contribution signals according to the input speech signals, and a keynote is obtained according to the characteristic function values of residual signals; the other method comprises the following steps: in input speech signals, a pulse with maximum amplitude or amplitude value is found; according to the position of the pulse with maximum amplitude or amplitude value, a target window is arranged aiming to the input speech signals; the target window is slided to obtain a sliding window, the correlation coefficient of the input speech signals in the sliding window and the input speech signals in the target window are calculated to obtain the maximum value of the correlation coefficient; the keynote is obtained basedon the maximum value of the correlation coefficient. By arranging the target window, the embodiment of the invention does not need to calculate the relevant function values of entire frame signals, which greatly lowers the complexity of keynote searching.

Description

technical field [0001] The embodiment of the present invention relates to the field of speech codec, and relates to a pitch search method and device. Background technique [0002] Generally, speech and audio signals have certain periodic characteristics, and the long-term periodicity in the speech and audio signals can be removed by using a long-term prediction (Long Term Prediction, hereinafter referred to as: LTP) method. When performing LTP prediction, it is necessary to search for pitch in advance. The prior art provides a pitch search method using an autocorrelation function. In a Moving Pictures Experts Group Audio Lossless Coding (MPEG ALS) device, the data in the history buffer is used as an excitation signal to predict the current frame signal. The following is an example of open-loop gene analysis. [0003] Firstly, the weighted speech signal s is obtained by inputting the original speech signal into the perceptual weighting filter w (n), the expression of perc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L15/02G10L19/08G10L25/90
CPCG10L25/06G10L25/90G10L19/09
Inventor 张德军许剑峰苗磊齐峰岩张清李立雄马付伟高扬
Owner HUAWEI TECH CO LTD