Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1976-08-06
1977-09-06
Heyman, John S.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
328138, 329126, H03K 906
Patent
active
040471144
ABSTRACT:
A digital detector which responds to sinusoidal or square wave input sign to detect the presence of a particular frequency or band of frequencies and provide a selectable digital output indicating the presence of this frequency or band. A gated pulse generator operates in response to the input signals, providing pulses that are counted by a binary counter and sensed by a decoder which detects the presence or absence of the frequencies within the selectable bandwidth limits.
REFERENCES:
patent: 3543172 (1970-11-01), Seppeler
patent: 3548328 (1970-12-01), Breikss
patent: 3594588 (1971-07-01), Evans et al.
patent: 3769583 (1973-10-01), Spencer et al.
patent: 3944935 (1976-03-01), Plant
patent: 3999136 (1976-12-01), O'Berry et al.
Fronek Donald K.
Lane Richard A.
Bush Freddie M.
Edelberg Nathan
Gibson Robert P.
Heyman John S.
The United States of America as represented by the Secretary of
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