Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1996-04-01
1998-06-30
McDonald, Allen R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704216, G10L 302, G10L 900
Patent
active
057748365
ABSTRACT:
An improved vocoder system and method for estimating pitch in a speech waveform which more accurately disregards false pitch estimates resulting from secondary excitations. The vocoder system first performs a correlation calculation on a speech frame and generates an estimated pitch value. The present invention then compares the estimated or determined pitch with a threshold value to determine if the determined or estimated pitch has a suspiciously low pitch value. If so, the present invention performs error checking to disregard pitch estimates that are the result of the First Formant frequency's contribution to the pitch estimation process. The error checking involves examining the higher multiples of the determined pitch value to ascertain whether the determined pitch value might be incorrect. The present invention determines whether one or more higher multiples are missing, whether the higher multiples are related by a common factor, and whether adjacent multiples have missing peaks. The error checking also involves searching for missing or low correlation peaks in the neighborhood of missing higher multiples of the determined pitch. If the error checking indicates that the determined pitch is probably incorrect, then a new determination is made without the correlation peak corresponding to the rejected determined pitch. This provides a more accurate pitch estimation, thus enhancing voice storage quality. The present invention thus comprises an improved correlation method for estimating the pitch parameter which more accurately disregards false correlation peaks resulting from secondary excitations, including the contribution of the First Formant.
REFERENCES:
patent: 3649765 (1972-03-01), Rabiner et al.
patent: 3979557 (1976-09-01), Schulman et al.
patent: 4544919 (1985-10-01), Gerson
patent: 4561102 (1985-12-01), Prezas
patent: 4696038 (1987-09-01), Doddington et al.
patent: 4731846 (1988-03-01), Secrest et al.
patent: 4817157 (1989-03-01), Gerson
patent: 4896361 (1990-01-01), Gerson
patent: 5195166 (1993-03-01), Hardwick et al.
patent: 5353372 (1994-10-01), Cook et al.
patent: 5473727 (1995-12-01), Nishiguchi et al.
Aldo Cumani, "On A Covariance-Lattice Algorithm For Linear Prediction," ICASSP 82 Proceedings, May 3, 4, 5, 1982, Palais Des Congres, Paris, France, vol. 2 of 3, IEEE International Conference on Acoustics, Speech and Signal Processing, pp. 651-654.
Hirose, et al; "A S cheme for Pitch Extraction of Speech Using Autocorrelation Function with Frame Length Proportional to the Time lag" ICASSP 92, vol. 1 pp. I-149-I-152.
McAuley et al; "Pitch Estimation and Voicing Detection Based On A Sinusoidal Model" ICASSP 90, pp. 249-252.
Atkinson, et al; "Pitch detection os speech signals using segmented autocorrelation" Electronics Letters Mar., 1995, vol. 31, pp. 533-535.
Bartkowiak John G.
Ireton Mark
Advanced Micro Devices , Inc.
Eduoard Patrick N.
Hood Jeffrey C.
McDonald Allen R.
LandOfFree
System and method for performing pitch estimation and error chec does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method for performing pitch estimation and error chec, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for performing pitch estimation and error chec will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1872038