Digital encoding circuitry

Details Digital encoding circuitry Digital encoding circuitry

1978-02-06

1980-02-26

Griffin, Robert L.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 11D, H03K 1322

Patent

active

041908015

ABSTRACT:
In an electrical system of the type in which a digitally encoded signal is determined at least in part by the difference between a present value of an input signal and a reference signal representative of a past value of the input signal, improved circuitry for generating the reference signal. The improved circuitry comprises extraction means including a filter for extracting from the pattern of bits in the digitally encoded signal information relating to the time derivative of the present value of the input signal to provide a corresponding control signal, and integrating means responsive to the control signal to provide the reference signal.

REFERENCES:
patent: 3109987 (1963-11-01), Linder
patent: 3490045 (1970-01-01), de Boer
patent: 3582784 (1971-06-01), Gaunt
patent: 3831092 (1974-08-01), Greefkes
patent: 3857111 (1974-12-01), Deschenes
patent: 3918042 (1975-11-01), Werner
patent: 3995217 (1976-11-01), Smith
patent: 4071825 (1978-01-01), McGuffin
HR-3210 All-Digital Continuously Variable Slope Delta Modulator, Harris Corporation 1976.
Motorola Semiconductors XC 3417, XC 3418, Motorola, Inc. 1977.
The FX-209 Delta Modulator, Consumer Microcircuits of America.

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