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Method for extracting base-sound period based on dynamic plan

A technology of pitch period and extraction method, applied in speech analysis, instruments, etc., can solve problems such as weakening performance

Inactive Publication Date: 2011-01-26
TSINGHUA UNIV
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Problems solved by technology

This method is equivalent to attenuating the effect of the inverse filter, preventing its adverse effects and weakening its performance

Method used

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  • Method for extracting base-sound period based on dynamic plan
  • Method for extracting base-sound period based on dynamic plan
  • Method for extracting base-sound period based on dynamic plan

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Embodiment Construction

[0049] The input voice signal first passes through a high-pass filter to filter out DC components and power frequency interference. A first-order IIR filter is used here, and the transfer function is

[0050] H HP ( z ) = 1 - z - 1 1 - 0.99 z - 1 - - - ( 1 )

[0051] Then perform low-pass filtering on the high-pass-filtered speech signal s(n) to remove the influence of high-frequency signals on pitch extraction. A Chebyshev II low-pass filter with a cutoff frequency of 800 Hz is selected, and its transfer function is

[0052] ...

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Abstract

A method for picking up fundamental tone cycle based on dynamic plan includes using inverse filtering to carry out spectrum flattening operation, limiting inverse filtering zero point position in concentric circle of a unit circle in unit circle, using section function to calculate path price and inputting voices-voiceless sound information for obtaining better picking-up performance under low time delay.

Description

technical field [0001] This delay-limited pitch extraction method is suitable for the field of speech coding. In the case of limited time delay, the improved dynamic programming method can effectively reduce the pitch extraction error and greatly improve the subjective auditory quality of the vocoder. Background technique [0002] Inverse filtering is a common spectral flattening method. In order to eliminate its adverse effects, M.Schroeder and B.Atal proposed in 1979 to use a formant weighted filter to attenuate the influence of the inverse filter. This method is equivalent to attenuating the effect of the inverse filter, preventing its adverse effects and weakening its performance. In this method, this is modified, and the zero point of the inverse filter is limited to prevent excessive attenuation of the frequency at the zero point, but the performance in general cases is not affected. [0003] Dynamic programming method is a commonly used smoothing algorithm. Bruce G...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/00G10L19/005G10L19/02
Inventor 崔慧娟唐昆魏旋党晓妍
Owner TSINGHUA UNIV
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