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
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[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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