Voice pitch period estimation method and device

A pitch period and speech technology, applied in the field of speech coding, can solve the problems that waveforms are susceptible to formants and noises, the pitch period changes in a large range, and the amount of calculation increases, so as to overcome frequency double and half frequency errors and improve anti-noise performance. , the effect of reducing the computational complexity
CN103474074AActive Publication Date: 2013-12-25广东广晟研究开发院有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
广东广晟研究开发院有限公司
Publication Date
2013-12-25

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Abstract

The invention relates to a voice pitch period estimation method and device. The device comprises a signal preprocessing unit, a normalized autocorrelation function computing element and a pitch period postprocessing unit. The method includes the steps of firstly, conducting preprocessing including direct current component removal, perception weighting and under-signal sampling on voice signals; secondly, computing normalized autocorrelation function values of the processed voice signals; thirdly, determining the maximum of the normalized autocorrelation function values in the pitch period searching range, and determining a pitch period candidate value corresponding to the maximum to be a pitch period estimation value of the voice signals. According to the voice pitch period estimation method and device, frequency doubling errors and frequency halving errors in the pitch period estimation are well overcome, the noise resistance performance of the pitch period estimation method is improved, meanwhile, the algorithm complexity of an algorithm is lowered, and the corresponding digital audio / speech coding efficiency is improved. The voice pitch period estimation method and device can be applied to pitch searching of various voice coding and decoding algorithms and have a wide application range.
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Description

technical field

[0001] The present invention relates to speech coding technology, more specifically, to a speech pitch period estimation method and device. Background technique

[0002] The pitch period refers to the period in which the vocal cords vibrate when a person makes a sound. Pitch period is an important issue in speech coding, and its accuracy will directly affect the coding quality and efficiency of the speech coder. Accurate pitch periodicity analysis can effectively remove redundancy in the speech coding process, reduce the number of coding bits, and realize low bit rate high-quality speech coding. However, due to the particularity of speech, the accurate search of the pitch period will face the following difficulties:

[0003] (1) The change of the speech signal is very complicated, the glottal excitation waveform is not a complete periodic pulse train, and the period of the speech waveform is time-varying.

[0004] (2) At the beginning and end of speech, th...

Claims

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