Picture signal processing circuit

Details Picture signal processing circuit Picture signal processing circuit

1986-09-15

1988-08-16

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358169, H04N 514

Patent

active

047648112

ABSTRACT:
A picture signal (PS1) occurring with picture information components at different signal levels in which the signal level differences are greater than the picture information differences at the signal levels is processed with the aid of an amplifier circuit (1-4) to produce a picture signal comprising picture information differences between a minimum and a maximum value. To this end the amplifier circuit comprises two parallel signal channels (1, 2) and (3, 4) and a change-over circuit (2, 4, 5-16) via which one channel for signal processing is operative dependent on the picture signal level, while per channel, for example, a different gain factor (A or B) and a different bias (OV or +Vb) is present for a signal level shift. Change-over is effected by a voltage comparison circuit (5-10, 12-15) which is connected to the output of an amplifier (1) of the amplifier circuit (1-4) and compares the output voltage with a subtantially constant direct voltage.

REFERENCES:
patent: 3205446 (1965-09-01), Altemus
patent: 3597617 (1971-08-01), Passaro
patent: 3704342 (1972-11-01), Stoddard et al.
patent: 4187519 (1980-02-01), Vitols et al.
patent: 4229764 (1980-10-01), Danas

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-603576