Display control apparatus using display synchronizing signal

Details Display control apparatus using display synchronizing signal Display control apparatus using display synchronizing signal

1994-12-27

1999-06-15

Kostak, Victor R.

Television

Synchronization

Automatic phase or frequency control

348526, 345213, G03B 1300

Patent

active

059127139

ABSTRACT:
A horizontal synchronizing signal is applied as a reference signal and a voltage-controlled oscillator outputs a display clock signal on the basis of the frequency of the horizontal synchronizing signal. The frequency of the display clock signal is frequency-divided in accordance with a frequency-dividing value selected from among a plurality of frequency-dividing signals stored in advance, the difference in frequency between the frequency-divided display clock signal and the horizontal synchronizing signal and the phase difference between them are obtained by a phase comparator, and the frequency of the signal outputted by the voltage-controlled oscillator is decided in dependence upon the frequency difference. In an interval in which a vertical synchronizing signal turns off and the frequency of the horizontal synchronizing signal fluctuates, the reference signal and the horizontal synchronizing signal input to the phase comparator are held fixed to prevent a fluctuation in the outputted display clock.

REFERENCES:
patent: 4795239 (1989-01-01), Yamashita et al.
patent: 4809068 (1989-02-01), Nagai
patent: 4812783 (1989-03-01), Honjo et al.
patent: 4827341 (1989-05-01), Akimoto et al.
patent: 4843471 (1989-06-01), Yazawa et al.
patent: 5068731 (1991-11-01), Takeuchi
patent: 5124621 (1992-06-01), Srivastava
patent: 5184350 (1993-02-01), Dara
patent: 5185603 (1993-02-01), Medin
patent: 5202906 (1993-04-01), Saito et al.
patent: 5353041 (1994-10-01), Miyamoto et al.

Affiliated with

Also associated with

Rating

Display control apparatus using display synchronizing signal does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Display control apparatus using display synchronizing signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Display control apparatus using display synchronizing signal will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-405945