Circuit arrangement for frequency-modulated picture signals

Details Circuit arrangement for frequency-modulated picture signals Circuit arrangement for frequency-modulated picture signals

1987-04-09

1990-01-30

Groody, James J.

Demodulators

Frequency modulation demodulator

Having specific distortion, noise or other interference...

329336, H03D 302

Patent

active

048976083

ABSTRACT:
A circuit arrangement for a picture reproducing apparatus having an amplitude limited (7), to which a frequency-modulated picture signal is applied and whose output is coupled to a frequency demodulator (8, 9). The output signal of the amplitude limiter (7) is applied to a low-pass filter (12) via a delay means (8) which may form part of the frequency demodulator (8, 9), the output signal of the low-pass filter following fluctuations in time-average of the output signal of the delay means (8). The delay time of the delay means (8) is of the order of magnitude of a quarter of the carrier period of the frequency-modulated picture signal. The output signal of the low-pass filter (12) constitutes the threshold value of the amplitude limiter (7), the polarity of the output signal of said limiter being changed when the frequency-modulated picture signal intersects said threshold value.

REFERENCES:
patent: 3701030 (1972-10-01), Gocho et al.
patent: 4142208 (1979-02-01), Oprandi et al.
patent: 4585952 (1986-04-01), Yamamoto
Shadden, V. A., "Reference Feedback Circuit for Phase-Modulated Signal Demodulation", IBM Technical Disclosure, vol. 17, #11, pp. 3319-3320.
"So funktioniert ein Videorecorder", by U. Grothaus, Funkschau, 1984, vol. 15, pp. 42-45.

Affiliated with

Also associated with

Rating

Circuit arrangement for frequency-modulated picture signals does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit arrangement for frequency-modulated picture signals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit arrangement for frequency-modulated picture signals will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1925473