Fast significant sample detection for a pitch detector

Details Fast significant sample detection for a pitch detector Fast significant sample detection for a pitch detector

1986-10-31

1989-02-07

Salce, Patrick R.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 50, 3645135, G10L 100

Patent

active

048037303

ABSTRACT:
Improved significant sample detection for a pitch detector for use with speech analysis and synthesis methods by performing a reverse order search and a forward order search of digitized speech samples. A reverse search detector is responsive to segmented digital samples for determining a set of candidate samples by initially selecting one of the digitized samples as a present candidate sample and comparing in reverse order each of the digitized samples with the present candidate sample until a digitized sample is found whose amplitude is greater than the present candidate sample or the compared sample is greater than a predefined number of samples from the present candidate sample. When either of the previous conditions occurs, the compared digital sample becomes the new present candidate sample and the reverse search continues. After the reverse search has been performed and a set of candidate samples has been determined, a forward search detector then initially determines a present significant sample. The latter detector compares this significant sample with each of the candidate samples until a candidate sample is found whose amplitude is greater than the present significant sample or the compared candidate sample is more than a predefined number of samples away from the present significant sample. When either of those conditions occurs, the forward search detector saves the value of the amplitude and location of the candidate sample and replaces the present significant sample with that candidate sample and continues the search.

REFERENCES:
patent: 4161625 (1979-07-01), Katterfeldt et al.
patent: 4282405 (1981-08-01), Taguchi
patent: 4282406 (1981-08-01), Yato et al.
patent: 4561102 (1985-12-01), Prezas
patent: 4653098 (1987-03-01), Nakata et al.
The Bell System Technical Journal, vol. 54, No. 2, Feb. 1975, pp. 297 -315, A.T.&T. Co, Rabiner et al, "An Algorithm for Determing the Endpoints of Isolated Utterances".
Pending application, J. Picone, et al, Case 1-4 "A Parallel Processing Pitch Detector", application Ser. No. 770,633, filed on Aug. 28, 1985.

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