Video signal processing circuit

Details Video signal processing circuit Video signal processing circuit

1980-11-21

1983-01-18

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358171, 358172, H04N 516

Patent

active

043694667

ABSTRACT:
A video signal processing circuit for an input video signal having a DC level, a pedestal level, and a blanking period, includes a first clamp circuit for clamping the pedestal level of the input video signal to a first predetermined DC level in response to a clamp voltage supplied from a clamp voltage source, a blanking circuit for setting the level of the input video signal to a second predetermined DC level which is higher than the pedestal level of the input video signal during the blanking period of the input video signal and for producing a wave-formed signal, a peak-hold circuit for detecting and holding the darkest level of the wave-formed signal and for producing a peak-held signal, a series circuit of a diode and resistor, which produces a threshold level signal, connected between the first clamp circuit and the output of the peak-held circuit, a comparator circuit supplied at one input with the lower of the threshold level signal and the peak-held signal and supplied at another input with the output from the first clamp circuit for comparing the signals supplied thereto and for producing an output signal corresponding to the higher one of the compared signals, and an average picture level detecting circuit including a variable impedance element connected to the resistor for increasing the threshold level signal in response to increases in the average picture level of the input video signal.

REFERENCES:
patent: 3970777 (1976-07-01), Bradford et al.

Affiliated with

Also associated with

Rating

Video signal processing 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 Video signal processing circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Video signal processing circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-139371