Pitch detector for speech analysis

Details Pitch detector for speech analysis Pitch detector for speech analysis

1982-09-20

1985-12-24

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

G10L 100

Patent

active

045611025

ABSTRACT:
Speech signal pitch detection uses the residual signal output of an LPC (linear prediction coder) filter. The residual signal (or its Hilbert transform) is divided into frames of 20 milliseconds, and each frame searched for signal peak periodicity by first detecting the highest peak, then detecting a set of equally-spaced selected samples from which the pitch period is determined. If no periodicity is found over three frames, an unvoiced decision is made.

REFERENCES:
patent: 3631520 (1971-12-01), Atal
patent: 3740476 (1973-06-01), Atal
patent: 3975587 (1976-08-01), Dunn et al.
patent: 4081605 (1978-03-01), Kitawaki et al.
patent: 4282405 (1981-08-01), Taguchi
patent: 4282406 (1981-08-01), Yato et al.

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