Method of and device for coding speech signals with analysis-by-

Details Method of and device for coding speech signals with analysis-by- Method of and device for coding speech signals with analysis-by-

1994-02-16

1995-11-21

MacDonald, Allen R.

395 232, G10L 900

Patent

active

054695279

ABSTRACT:
The set of possible excitation signals is subdivided into a plurality of subsets, the first of which provides the contribution to the coded signal necessary to set up a transmission at a minimum rate guaranteed by the network, while the others supply a contribution which, when added to that of the first subset, causes a rate increase by successive steps. At the receiving side, a decoded signal is generated by using the excitation contribution of the first subset alone if the coded signals are received at the minimum rate, while for rates higher than the minimum rate the contributions of the subsets which have allowed such rate increase are also used.

REFERENCES:
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patent: 5353373 (1994-10-01), Drogo de Iacovo et al.
M. Johnson, T. Taniguchi, "Pitch-Orthogonal Code-Excited LPC," Globecom '90 EEE Global Telecommunications Conference & Exhibition, Dec. 2, 1990, pp. 542-546.
W.-Y. Chan, A. Gersho, "High Fidelity Audio Transform Coding with Vector Quantization," ICASSP '90, Int'l Conf. on Acoustics, Speech and Signal Processing, Apr. 3, 1990, pp. 1109-1112.
G. Davidson, A. Gersho, "Multiple-Stage Vector Excitation Coding of Speech Waveforms," ICASSP '88 IEEE Int'l Conf. on Acoustics, Speech and Signal Processing, Apr. 11, 1988, pp. 163-166.
Drogo de Iacovo et al., "Embedded CELP Coding for Variable Bit-Rate Between 6.4 and 9.6 Kbit/s," CSELT Tech. Reports, Nov. 1991, 19(5):363-66.

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