Process for multirate encoding signals and device for implementi

Details Process for multirate encoding signals and device for implementi Process for multirate encoding signals and device for implementi

1987-09-24

1990-03-27

Shoop, Jr., William M.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 35, G10L 302

Patent

active

049127632

ABSTRACT:
A process for multirate subband encoding voice signals.
At least a portion of the original signal bandwidth is split into p sub-bands the contents of which are to be coded using dynamic allocation of quantizing levels throughout the sub-bands.
Let's assume the signal is to be coded for a set of coding rates R(1) <R(2)<. . .<R(k) . . . <R(K). First the number of quantizing levels 1(i, R(1)) for the lowest rate is determined. Then the levels for 1(i, R(k)), k=2, . . . , p are determined using: ##EQU1## Then the sub-band samples S(i,j) are quantized according to 1(i, R(K). Finally, the quantized sub-band samples are embedded into a multirate frame.

REFERENCES:
patent: 4464783 (1984-08-01), Beraud et al.
patent: 4589130 (1986-05-01), Galand
patent: 4622680 (1986-11-01), Zinser
patent: 4677671 (1987-06-01), Galand et al.
patent: 4713776 (1987-12-01), Araseki
Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing, Boston, Apr. 14th-16th, 1983, vol. 3, pp. 1284-1287, IEEE, New York, U.S.; C. R. Galand et al.: "Multirate Sub-Band Coder with Embedded Bit Stream: Application to Digital TASI".
Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing, Tampa, Mar. 26th-29th, 1985, vol. 4, pp. 1680-1683, IEEE, New York, U.S.; J. H. Derby et al.: "Multirate Sub-Band Coding Applied to Digital Speech Interpolation".

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