Method and apparatus for speech coding with voiced/unvoiced...

Details Method and apparatus for speech coding with voiced/unvoiced... Method and apparatus for speech coding with voiced/unvoiced...

2005-07-05

2005-07-05

Dorvil, Richemond (Department: 2654)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S206000, C704S207000, C704S208000

Reexamination Certificate

active

06915257

ABSTRACT:
This invention presents a voicing determination algorithm for classification of a speech signal segment as voiced or unvoiced. The algorithm is based on a normalized autocorrelation where the length of the window is proportional to the pitch period. The speech segment to be classified is further divided into a number of sub-segments, and the normalized autocorrelation is calculated for each sub-segment if a certain number of the normalized autocorrelation values is above a predetermined threshold, the speech segment is classified as voiced. To improve the performance of the voicing determination algorithm in unvoiced to voiced transients, the normalized autocorrelations of the last sub-segments are emphasized. The performance of the voicing decision algorithm can be enhanced by utilizing also the possible lookahead information.

REFERENCES:
patent: 4074069 (1978-02-01), Tokura et al.
patent: 4230906 (1980-10-01), Davis
patent: 4589131 (1986-05-01), Horvath et al.
patent: 5734789 (1998-03-01), Swaminathan et al.
patent: 6219636 (2001-04-01), Ihara
patent: 2334459 (1975-01-01), None
patent: 23 34 459 (1975-01-01), None
patent: WO 96/21220 (1996-07-01), None
patent: 98/01848 (1998-01-01), None
Rabiner et al., “Digital Processing of Speech Signals,” 1978, Prentice-Hall, Inc, pp. 158-162.
Hess, W., “Pitch and voicing determination,” in Advances in Speech Signal Processing, (1992) S. Furui & M. Sondhi (eds.), Marcel Dekker, New York, pp. 3-48.
Rabiner et al. “Applications of Nonlinear Smoothing Algorithm to Speech Processing,” in IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-23, No. 6, Dec. 1975, pp. 552-557.
Siegel et al. “Voiced/Unvoiced/Mixed Excitation Classification of Speech,” in IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-30, No. 3, Jun. 1982, pp. 451-460.

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