Horizontal synchronizing signal frequency measuring instrument f

Details Horizontal synchronizing signal frequency measuring instrument f Horizontal synchronizing signal frequency measuring instrument f

1997-04-24

1999-02-23

Wu, Xiao

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

348524, G09G 500

Patent

active

058749497

ABSTRACT:
The invention provides a horizontal synchronizing signal frequency measuring instrument which can measure a horizontal synchronizing signal frequency with a higher degree of accuracy. The horizontal synchronizing signal frequency measuring instrument includes a first counter for counting a reference clock signal, a second counter of the preset type for counting a horizontal synchronizing signal, and a control section operable to detect an edge of the vertical synchronizing signal, set a first preset value to the second counter, detect that a count value of pulses by the second counter reaches a first preset value, renders a count control signal active, reset and start the first and second counters, detect that the count value by the second counter reaches the second preset value, render the count control signal inactive and calculate a frequency of the horizontal synchronizing signal from the count value of the first counter, the second preset value and a frequency of the reference clock signal. The first counter counts the reference clock signal within a counting enabled period which is controlled by the count control signal.

REFERENCES:
patent: 5138451 (1992-08-01), Shinkawa et al.

Affiliated with

Also associated with

Rating

Horizontal synchronizing signal frequency measuring instrument f does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Horizontal synchronizing signal frequency measuring instrument f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Horizontal synchronizing signal frequency measuring instrument f will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-311261