Bi-Phase harmonic histogram pitch extractor

Details Bi-Phase harmonic histogram pitch extractor Bi-Phase harmonic histogram pitch extractor

1977-05-20

1978-05-23

Claffy, Kathleen H.

G10L 100

Patent

active

040912370

ABSTRACT:
A digital voice pitch extractor is disclosed that determines the pitch frequency of human speech in real-time or at the same rate as it is uttered. The invention does not need the full bandwidth of the speech signal in order to perform its function. It will accept band-limited signals lacking fundamental pitch energy such as those from telephone channels. The signal can be severely degraded by added noise and the pitch extractor will still reliably determine the pitch.
The invention includes a bank of contiguous bandpass filters. The outputs of each of the filters are converted to pulse trains and are summed to form a bi-phase harmonic histogram. The fundamental period is derived from the histogram and is verified by an error correction circuit.
The circuit stability and accuracy needed to perform this task is achieved through the use of digital, as opposed to analog, electrical circuits in the main portion of the voice pitch extractor and the use of noise minimizing techniques.

REFERENCES:
patent: 3420955 (1969-01-01), Noll
patent: 3875336 (1975-04-01), Mullen
R. Miller, "Performance Characteristics of an Experimental etc.", J. of Ac. Soc. Am., 1970 pp. 1593-1598.

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