Differential pulse code modulation coder

Details Differential pulse code modulation coder Differential pulse code modulation coder

1985-08-19

1987-04-14

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

332 11D, 375 27, H03M 304

Patent

active

046582398

ABSTRACT:
A differential pulse code modulation coder has a pair of series connected arithmetic units connected to the input of a quantizer, with the output of the quantizer connected through a first multiplier to an input of the second arithmetic unit, and the output of the quantizer connected through an adder and further multiplier to the second input of the first arithmetic unit, the second input of said adder being derived from the output of said second multiplier, whereby greater internal calculation speed is realized.

REFERENCES:
patent: 4470146 (1984-09-01), Yatsuzuka et al.
patent: 4541102 (1985-09-01), Grallert
Globecom '82-Conference Record (1982), pp. 246-248.
P. Maruta, "Per-Channel ADPCM Codec for Multi-Purpose Applications", pp. 244-245.

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