Circuitry for generating reference signal for delta encoding sys

Details Circuitry for generating reference signal for delta encoding sys Circuitry for generating reference signal for delta encoding sys

1979-08-30

1981-12-08

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

375 29, H03K 1322

Patent

active

043050506

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 and an envelope detector for processing the output of the filter to provide a control signal, and integrating means responsive to the control signal to provide the reference signal.

REFERENCES:
patent: 3727135 (1973-04-01), Holzer
patent: 3857111 (1974-12-01), Deschenes et al.
patent: 4071825 (1978-01-01), McGuffin

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