Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1983-03-03
1985-08-27
Westin, Edward P.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
375 29, H03K 1322
Patent
active
RE0319767
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.
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patent: 4071825 (1978-01-01), McGuffin
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Analog and Digital Systems, Inc.
Westin Edward P.
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