Noise reduction method and apparatus for companded delta modulat

Details Noise reduction method and apparatus for companded delta modulat Noise reduction method and apparatus for companded delta modulat

1977-10-17

1978-08-29

Kominski, John

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

325 38B, H03K 702

Patent

active

041107055

ABSTRACT:
A noise reduction circuit and method are described for implementation in a delta modulation system for signal transmission. Under certain conditions when the delta modulator has selected the minimum step size for encoding and transmission, the present technique and apparatus are effective to change the minimum step size in a way which prevents low level noise generation from occurring in the delta modulation system. The technique and circuit can be utilized with most commonly available delta modulators which have means for changing the step size (i.e., the delta) but is used to the best effect on more stable implementations of delta modulators where an integrator is replaced by a digital accumulator and a digital-to-analog converter.

REFERENCES:
patent: 3716803 (1973-02-01), Candy
patent: 3806806 (1974-04-01), Brolin
patent: 3995218 (1976-11-01), Moriya
patent: 4025852 (1977-05-01), Ching
IBM Tech. Discl. Bull. "Delta coder," H. R. Schindler, vol. 13, No. 8, Jan. 1971.
IBM Tech. Discl. Bull. "Step Gen. for Delta Mod.," V. Appel, vol. 16, No. 11, Apr. 1974.

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