Patent
1992-06-16
1994-05-17
Fleming, Michael R.
G10L 902
Patent
active
053135547
ABSTRACT:
An exemplary CELP coder where gain adaptation is performed using previous gain values in conjunction with an entry in a table comprising the logarithms of the root-mean-squared values of the codebook vectors, to predict the next gain value. Not only is this method less complex because the table entries are determined off-line, but in addition the use of a table at both the encoder and the decoder allows fixed-point/floating-point interoperability requirements to be met.
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Dymarski P., et al., "Optimal and suboptimal algorithms for selecting the excitation in linear predictive coders", ICASSP 90, vol. 1, pp. 485-488, IEEE, 1990.
J. Chen et al., "A Fixed-Point 16 Kb/s LD-CELP Algorithm", ICASSP 90 Proceedings, 1990 International Conference on Acoustics, Speech, and Signal Processing, Apr. 3-6, 1990, pp. 21-24.
J. Chen, "High-Quality 16 Kb/s Speech Coding with a One-Way Delay Less Than 2 ms", ICASSP 91 Proceedings, 1991 International Conference on Acoustics, Speech, and Signal Processing, May 14-17, 1991, pp. 453-456.
CCITT Draft Recommendation G.72x, Coding of Speech at 16 kbit/s Using Low-Delay Code Excited Linear Prediction (LD-CELP), pp. 1-30, Nov. 1991, Study Group XV.
AT&T Bell Laboratories
Doerrler Michelle
Fleming Michael R.
Johannesen Michael B.
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