Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1988-01-27
1989-07-25
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
307514, 328140, 329145, H03K 906
Patent
active
048517852
ABSTRACT:
A circuit arrangement for detecting whether the frequency of an input signal exceeds a predetermined frequency swing. The arrangement includes a detector circuit which supplies an error-indication signal if the phase shift between the input signal and a second signal, which second signal tracks the frequency of the input signal, exceeds limit values corresponding to such frequency swing. A delay circuit derives the second signal from the input signal by delaying the input signal a predetermined delay time which increases with the frequency of the input signal.
REFERENCES:
patent: 3778727 (1973-12-01), Williams
patent: 4403185 (1983-09-01), Charles
Gehrt Heinz H.
Hildebrandt Gunter
Rehfeldt Karl-Heinz
Briody Thomas A.
Eason Leroy
Grimm Siegfried H.
Tamoshunas Algy
U.S. Philips Corp.
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