Low-complexity method for improving the performance of autocorre

Details Low-complexity method for improving the performance of autocorre Low-complexity method for improving the performance of autocorre

1990-12-24

1992-06-30

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 36, G10L 500

Patent

active

051270536

ABSTRACT:
A method of operating an autocorrelation pitch detector for use in a vocoder overcomes the pitch doubling and tripling problem using a heuristic rather than an analytic approach. The process tracks the times of occurrence of a highest and a second-highest autocorrelation peak. The amplitudes of the highest and the second-highest autocorrelation peaks are compared and, when these peaks are within a predetermined percentage difference in amplitude, the ratio of the time position (IPITCH2) of the second-highest peak to the time position (IPITCH) of the highest peak is checked to determine if that ratio is 1/3, 1/2 or 2/3, within a predetermined error limit .epsilon.. If so and if the ratio is either 1/2 or 1/3, then IPITCH is set equal to IPITCH2 as reepresentative of the pitch period while, if the ratio is 2/3, then IPITCH is divided by three in order to represent the pitch period.

REFERENCES:
patent: 4184049 (1980-01-01), Crochibne
patent: 4360708 (1982-11-01), Taunchi
Fujisaki et al., "A New Ssytem for Reliable Pitch Extraction of Speech", IEEE Proc. of 1987 Int. Conf. on Acoustics, Speech and Signal Processing, pp. 2422-2424.
Picone et al., "Robust Pitch Detection in a Noisy Telephone Environment", IEEE Proc. of 1987 Int. Conf. on Acoustics, Speech and Signal Processing, pp. 1442-1445.

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