Video signal frequency modulator having automatic control functi

Details Video signal frequency modulator having automatic control functi Video signal frequency modulator having automatic control functi

1996-09-12

1997-08-05

Tran, Thai

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

386 26, 386 93, 348678, 348735, 360 30, H04N 591, H04N 980, H04N 552, H04N 550

Patent

active

056550472

ABSTRACT:
A video signal frequency modulator having an automatic control function includes a reference generator for generating a sync tip level signal and a white peak level signal, a first switch for selecting one of the sync tip level signal, white peak level signal or a clamped video signal according to a mode control signal, a variable gain amplifier for amplifying the output of the first switch to a predetermined gain and converting the amplified result into a current, an adder for adding the output of the variable gain amplifier with a predetermined set value, an oscillator for frequency-modulating the output of the adder, a frequency detector for shaping and frequency-dividing the output of the oscillator, a microcomputer for comparing the output of the frequency detector with a predetermined reference frequency and outputting first and second control data and the mode control signal, a carrier frequency setting portion for controlling the magnitude of the predetermined set value according to the first control data, and a frequency deviation setting portion for controlling the predetermined gain according to the second control data.

REFERENCES:
patent: 4703340 (1987-10-01), Balaban et al.
patent: 4918529 (1990-04-01), Douziech et al.
patent: 5355226 (1994-10-01), Nogami et al.

Affiliated with

Also associated with

Rating

Video signal frequency modulator having automatic control functi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Video signal frequency modulator having automatic control functi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Video signal frequency modulator having automatic control functi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1080760