Method of estimating pitch by using ratio of maximum peak to...

Details Method of estimating pitch by using ratio of maximum peak to... Method of estimating pitch by using ratio of maximum peak to...

2003-07-25

2008-11-25

Vo, Huyen X (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S217000, C704S223000, C704S214000

Reexamination Certificate

active

07457744

ABSTRACT:
A device and a method for estimating an open-loop pitch in a general speech CODEC are disclosed. The open-loop pitch estimation device includes an autocorrelation function calculation unit which calculates a normalized autocorrelation function from a perceptual weighing filtered speech signal, a maximum autocorrelation function and lag estimation unit which estimates a maximum autocorrelation function and candidates for the maximum autocorrelation function, a pitch candidate decision unit which decides candidates for a pitch by using the ratio of the estimated maximum autocorrelation function to the candidates for the estimated maximum autocorrelation function, and lags of which values are smaller than a predetermined threshold value, and a pitch estimation unit which estimates a pitch between the candidates for a pitch and the lags corresponding to the estimated maximum autocorrelation function by using a pitch of a previous frame of the speech signal.

REFERENCES:
patent: 6199035 (2001-03-01), Lakaniemi et al.
patent: 6415252 (2002-07-01), Peng et al.
patent: 6594626 (2003-07-01), Suzuki et al.
patent: 6804639 (2004-10-01), Ehara
Pasi Ojala et al.,; “A Novel Pitch-Lag Search Method Using Adaptive Weighting and Median Filtering”; Nokia Research Center; 0-7803-5651-9/11; 1999 IEEE pp. 114-116.

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