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US 4,031,479 AGranted
Peak detecting demodulator
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsVirgil E. Thomas, Jr., Donald G. Quist
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Abstract
A demodulator wherein the typical low-pass filter is replaced with a sample nd hold circuit. By sampling the peak information of the input a-c signal and storing until the next peak sample, an output of extremely low ripple is accomplished.
Claims5
A demodulator for converting varying amplitude alternating current (a.c.) signals into direct current (d.c.) format representative of the information contained therein, comprising:
- first and second a.c. signals of identical frequency, wherein said first signal is the input of said demodulator containing said information and said second signal is a reference signal;
- rectifying means for full-wave rectifying said input and providing an output of either all positive value pulses or all negative value pulses;
- gated means for sampling and holding the value of said pulses when said gated means is gated;
- and
- timing means coupled to said reference signal for gating said gated means at only the peak values of said pulses,
- such that the value held by said gated means is the demodulator's output, which is a d.c. format representative of at least part of the information contained in said a.c. signal.
3 more elements
Dependencies are inferred from the claim text.