Pulse generating circuit

Details Pulse generating circuit Pulse generating circuit

1989-12-05

1991-05-28

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, 331 20, H04N 504, H03L 700

Patent

active

050199072

ABSTRACT:
Horizontal synchronizing signals included in a video signal are inputted to a PLL circuit. A counter as a divider in the PLL circuit outputs signals which are synchronized with the horizontal synchronizing signals. A gate pulse generator counts the output pulses of counter and produces a control signal for controlling a phase comparator as one of elements of the PLL circuit. The operation of phase comparator is stopped in vertical intervals in accordance with the control signal so that the phase comparator is not affected by signals which are included in the video signal and are not synchronized with the horizontal synchronizing signals. Thus, the PLL circuit produces pulses which are synchronized with the horizontal synchronizing signals in a wide frequency range.

REFERENCES:
patent: 4245251 (1981-01-01), Steckler et al.
patent: 4251833 (1981-02-01), Fernsler et al.
patent: 4253116 (1981-02-01), Rodgers, III
patent: 4780759 (1988-10-01), Matsushima et al.
patent: 4809068 (1989-02-01), Naga
patent: 4812783 (1989-03-01), Honjo et al.

Affiliated with

Also associated with

Rating

Pulse generating circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pulse generating circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pulse generating circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-39702