Pitch detecting device

Details Pitch detecting device Pitch detecting device

1986-12-18

1989-07-04

Shoop, Jr., William M.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 37, 381 49, 3645135, G01L 702

Patent

active

048457531

ABSTRACT:
A pitch detecting device includes an inverse filter for receiving a voice signal and subjecting the voice signal to inverse filter processing, thereby obtaining a residual signal of the voice, a correlation calculating circuit for obtaining an autocorrelation function of an output of the inverse filter, a detector for detecting a maximum value of the output from the correlation calculating circuit and outputting it as a pitch of the voice signal, and a circuit for receiving the voice signal, extracting spectrum data of the voice signal, and controlling the order of the inverse filter in accordance with the spectrum data. '

REFERENCES:
patent: 4282406 (1981-08-01), Yato et al.
patent: 4561102 (1985-12-01), Prezas
patent: 4701954 (1987-10-01), Atal

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