Method for enhancing the quality of coded speech

Details Method for enhancing the quality of coded speech Method for enhancing the quality of coded speech

1986-12-16

1989-07-25

Shoop, Jr., William M.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 36, 381 41, 381 51, 3645135, G10L 702

Patent

active

048521698

ABSTRACT:
A comb filter minimizes framing noise resulting from block encoding of speech. The comb filter has both pitch and coefficients adapted to the speech data. Block boundaries may be centered on filter segments of a fixed duration.

REFERENCES:
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patent: 4200810 (1980-04-01), Cain et al.
patent: 4307380 (1981-12-01), Gander
patent: 4541111 (1985-09-01), Takashima et al.
R. H. Frazier, S. Samsam, L. D. Braida and A. V. Oppenheim, "Enhancement of Speech by Adaptive Filtering," Proc. 1976 IEEE Int. Conf. Acoust., Speech, Signal Processing, Philadelphia, PA, pp. 251-253, Apr. 12-14, 1976.
J. S. Lim, A. V. Oppenheim, and L. D. Braida, "Evaluation of an Adaptive Com Filtering Method for Enhancing Speech Degraded by White Noise Addition," IEEE Trans. Acoust., Speech, Signal Processing, vol. ASSP-26, pp. 354-358, Aug. 1978.
R. V. Cox and D. Malah, "A Technique for Perceptually Reducing Periodically Structured Noise in Speech," Proc. 1981 IEEE Int. Conf. Acoust., Speech, Signal Processing, Atlanta, Georgia, pp. 1089-1092, Mar. 30-Apr. 1, 1981.
G. A. Clark et al., "Block Implementation of Adaptive Digital Filters," IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSp-29, No. 3, Part III, Jun. 1981, pp. 744-752.
D. Malah and R. V. Cox, "A Generalized Comb Filtering Technique for Speech Enhancement," Proc. 1982 IEEE Int. Conf. Acoust., Speech, Signal Processing, Paris, France, pp. 160-163, May 3-5, 1982.

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