Patent
1991-11-26
1993-10-12
Fleming, Michael R.
G10L 914
Patent
active
052533263
ABSTRACT:
A priority assignment method and device are set forth for assigning a priority to a selected speech frame coded by a linear predictive coder based on at least two of: an energy of the speech frame, a log spectral distance between a frame and a frame immediately previous, and a pitch predictor coefficient for the selected speech frame. The invention protects against loss of perceptually important and hard-to-reconstruct speech frames.
REFERENCES:
patent: 4815134 (1989-03-01), Picone et al.
patent: 5091945 (1992-02-01), Kleijn
"Priority Discarding of Speech in Integrated Packet Networks", by David W. Petr, Luiz A. DaSilva, Jr., and Victor S. Frost, IEEE T Journal on Selected Areas in, Communications, vol. 7, No. 5, Jun. 1989, pp. 644-656.
"Congestion Control for Packet Voice by Selective Packet Discarding", by Nanying Yin, San-Qi Li, and Thomas E. Stern, IEEE Transactions on Communications, vol. 38, No. 5, May 1990, pp. 674-683.
"Code-Excited Linear Prediction (CELP): High-Quality Speech At Very Low Bit Rates", by Manfred R. Schroeder and Bishnu S. Atal, IEEE, 1985, pp. 937-940.
"Distance Measures for Speech Processing", by Augustine H. Gray, Jr., and John D. Markel, IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-24, No. 5, Oct. 1976, pp. 380-391.
Codex Corporation
Doerrler Michelle
Fleming Michael R.
Stockley Darleen J.
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