Lost frame concealment

Details Lost frame concealment Lost frame concealment

1994-06-10

1997-01-21

Knepper, David D.

Excavating

395 242, 395 255, 371 65, H04B 110

Patent

active

055966780

ABSTRACT:
A receiver in a frame based radio communication system includes a speech decoder of the source-filter type which is controlled by internal state variables updated on a frame by frame basis for modifying received filter defining parameters representing background sounds transmitted over a communication channel. The receiver detects frame loss and conceals the effects of frame loss by restricting updating of at least one of the internal state variables.

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L. R. Rabiner, "Applications of Voice Processing to Telecommunications", Proc. IEEE, vol. 82, No. 2, pp. 199-228.
International Publication No. WO 89/08910.
J. G. Proakis, "Digital Communication", 2nd Ed, McGraw-Hill, 1989 pp. 220-234, 362-365, and 593-624.
G. C. Clark et al., "Error Correction Coding for Digital Communication", Plenum Press 1981, pp. 1-17, 49-53, 73-75 and 227-235.
T. B. Minde et al., "Techniques for Low Bit Rate Speech Coding Using Long Analysis Frames", ICASSP, Minneapolis, USA, 1993.
B. S. Atal et al., "Advances in Speech Coding", Kluwer Academic Publishers, 1991 pp. 69-79.
"Voice Activity Detection", Recommendation GSM 06.32, ETSI/GSM, 1991.
Bryden, Seguin, Conan, Bhargava, and Brind'Amour, "Error Correction/Masking for Digital Voice Transmission Over the Land Mobile Satellite System", IEEE Transactions on Communications, vol. 37, p. 312 Mar. 1989.

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