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Pitch extraction method and device

A technology for extracting devices and tones, which is applied in transmissions, differential transmissions, voice analysis, etc., and can solve problems such as difficulty in correcting tones, inability to obtain tones, and difficulty in distinguishing between tones and noise parts

Inactive Publication Date: 2004-04-21
SONY CORP
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AI Technical Summary

Problems solved by technology

Therefore, it is very difficult to extract the pitch from the speech signal passing through the LPF to get the correct pitch of the speech signal containing the impulsive pitch in the low frequency component
[0005] On the contrary, if the voice signal including the pulse tone in the low frequency part is passed through only the high-pass filter (HPF) because the pulse low frequency part is not removed, and if the voice signal waveform is a waveform containing a large amount of noise, the tone and the noise part are very different. Difficult to distinguish from each other, let alone get the correct pitch

Method used

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  • Pitch extraction method and device

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Embodiment Construction

[0016] Preferred embodiments of the present invention are explained in detail below with reference to the accompanying drawings.

[0017] figure 1 Schematically shows the structure of a pitch search device using the pitch extraction device according to the present invention. figure 2 The structure of the tone extracting apparatus according to the present invention is schematically shown.

[0018] figure 2 The tone extracting device shown in comprises: HPF12 and LPF16, they are used as filtering device, is used to limit the speech signal of input to some frequency bands in the frequency band of a plurality of different frequencies; And autocorrelation (data) calculation unit 13,17, As an autocorrelation (data) computing means for computing preset unit autocorrelation data for each speech signal from the respective frequency bands of HPF12 and LPF16. The tone extracting means also includes tone intensity / pitch delay (lag) calculation units 14, 18 as pitch period calculation...

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Abstract

A pitch extraction method and apparatus whereby the pitch of a speech signal having various characteristics can be extracted accurately. The frame-based input speech signal, band-limited by an HPF 12 and an LPF 16, is sent to autocorrelation computing units 13, 17 where autocorrelation data is found. The pitch lag is computed and normalized in the pitch intensity / pitch lag computing units 14, 18. The pitch reliability of the input speech signals, limited by the HPF 12 and the LPF 16, is computed in elevation parameter calculation units. A selection unit 20 selects one of the parameters obtained from the input speech signal, limited by the HPF 12 and the LPF 16, using the pitch lag and the evaluation parameter.

Description

technical field [0001] The present invention relates to a method and a device for extracting pitch from an input speech signal. Background technique [0002] The speech is classified into voiced speech and unvoiced consonant speech. Voiced speech is accompanied by vocal cord vibration speech and is seen as periodic vibrations. Unvoiced consonant speech is speech that is not accompanied by vibrations of the vocal cords and is considered aperiodic noise. In normal speech, voiced speech accounts for the main part of the speech, while unvoiced speech includes only some special consonants called unvoiced consonants. The period of voiced speech is determined by the period of vibration of the vocal cords and is called pitch period, while its repeated change is called pitch frequency. Pitch period and pitch frequency represent the main factors that determine the tone or pitch of speech. Therefore, it is very critical to accurately obtain the pitch period (pitch extraction) from ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L25/06G10L25/18G10L25/90H03H17/02
CPCG10L25/90G10L25/18G10L25/06G10L13/00F16H48/20
Inventor 饭岛和幸西口正之松本淳大森士郎
Owner SONY CORP
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