Method and apparatus for signal analysis

G - Physics – 06 – F

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G06F 17/10 (2006.01) G01H 17/00 (2006.01) G01R 23/02 (2006.01) G01R 23/16 (2006.01) G10L 11/04 (2006.01)

Patent

CA 2209417

A speech signal input from a microphone is distributed by a distribution amplifier. Using output signals of a filter group of cos phase having cut-off frequency moderate on low frequency side and steep on high frequency side and of similar filter group of sin phase, stability index is calculated based on magnitude of amplitude modulation and magnitude of frequency modulation of the signals, by stability index calculating portion and fundamental frequency extracting portion. Based on the result of calculation, approximate value of fundamental frequency is calculated based on an output of a channel indicating maximum stability, and based on the approximate value of fundamental frequency, instantaneous frequency extracting portion extracts precise instantaneous frequency as fundamental frequency, interpolating value of instantaneous frequency from adjacent frequency channels.

Un signal vocal provenant d'un microphone est distribué par un amplificateur de distribution. € l'aide des signaux de sortie d'un groupe de filtrage de cos à pente de coupure modérée à l'extrémité inférieure et à pente de coupure prononcée à l'extrémité supérieure et de ceux d'un groupe similaire de filtrage de sin , un dispositif calcule l'indice de stabilité à partir de l'ampleur de la modulation d'amplitude et de l'ampleur de la modulation de fréquence en collaboration avec un dispositif d'extraction de la fréquence fondamentale. D'après le résultat du calcul, une valeur approximative de la fréquence fondamentale est déterminée à partir du signal de sortie d'un canal indiquant un maximum de stabilité. Cette valeur approximative est utilisée par un dispositif d'extraction de la fréquence instantanée qui extrait la fréquence instantanée exacte comme fréquence fondamentale par interpolation des fréquences instantanées des canaux adjacents.

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