Quantization device with variable digital coding rate

Details Quantization device with variable digital coding rate Quantization device with variable digital coding rate

1991-02-08

1992-06-23

Logan, Sharon D.

Coded data generation or conversion

Digital code to digital code converters

Data rate conversion

341200, 341106, H03M 740, H03M 742

Patent

active

051247011

ABSTRACT:
A quantization device with variable digital coding rate for coding and decoding sound and speech in telecommunications and frequency transform coding. For a signal of amplitude .vertline.x.vertline. whose probability density is of the Laplace law type p(x)=.alpha./2e.sup.-.vertline.x.vertline., this device comprises a quantizer operator and a reverse quantizer operator. The quantizer operator includes an operator for calculating the ampltiude signal and a sign signal, an operator for combining the amplitude signal .vertline.x.vertline. and the number N of digital codes by subtracting a term KN=3/.alpha. Log (N+1) and a quantizer with fixed quantization thresholds in which the value of the thresholds Li is determined by the relation Li=-3/.alpha. Log (i+1). The reverse quantizer operator includes a reverse quantizer with fixed reverse quantization levels i with i=3/.alpha. Log (2i+2), an operator for combining a normed decoded amplitude signal and the number N of digital codes by addition of said term KN for delivering a decoded ampltiude signal .vertline.y.vertline. and an operator for combining the decoded amplitude signal .vertline.y.vertline. and the sign signal IS for delivering a reconstituted digital signal corresponding to the digital signal x.

REFERENCES:
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patent: 4464783 (1984-07-01), Beraud et al.
patent: 4954824 (1990-09-01), Yamada et al.
H. Kuroda et al., "1.5Mb/s Interframe Codec for Video Teleconferencing", Review of the Electrical Communication Laboratories, vol. 33, No. 4, 1985, pp. 631-638.
T. Tanguchi et al., "ADPCM with a Multiquantizer for Speech Coding" IEEE Journal on Selected Areas in Communications, vol. 6, No. 2, Feb. 1988, pp. 410-424.

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