Closed loop companding ratio control for continuously variable s

Details Closed loop companding ratio control for continuously variable s Closed loop companding ratio control for continuously variable s

1977-02-14

1979-04-24

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

325 38B, 340347AD, H03K 1322

Patent

active

041515170

ABSTRACT:
A monolithic integrated circuit encoder/decoder capable of converting an analog signal to a digital signal and capable of reconstructing an analog signal from a digital signal employing continuously variable slope delta modulation. The dynamic range of the continuous variable slope delta modulation is increased by employing means for providing a companding ratio reference coupled to a means for comparing the companding ratio reference against a filtered coincidence output from the encoder/decoder and then amplifying any difference therebetween. The difference is used to control the gain of the continuously variable slope delta modulator and can be used to modify the companding ratio reference to provide a closed-loop controlled companding ratio for the encoder/decoder.

REFERENCES:
patent: 3729678 (1973-04-01), Glasbergen
patent: 3806806 (1974-04-01), Brolin
patent: 3831092 (1974-08-01), Greefkes
patent: 3868574 (1975-02-01), Ferrieu
patent: 3922606 (1975-11-01), Nordling
patent: 3995218 (1976-11-01), Moriya
patent: 4042921 (1977-08-01), Smith
Jayant, "Proceedings of the IEEE", vol. 62, No. 5, May 1974, pp. 611-632.

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