Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Patent
1992-04-30
1994-11-29
Groody, James J.
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
348571, H04N 5208
Patent
active
053694465
ABSTRACT:
A video input signal is applied to a delay circuit having a plurality of taps which are coupled to maximum and minimum value selection circuits. In the absence of a video signal transient, the center tap of the delay circuit is coupled to an output terminal via an output switch. When a "white going" transient occurs, the output switch sequentially selects the outputs of the minimum and maximum value selectors for application to the output terminal. When a "black going" transient occurs, the output switch sequentially selects the outputs of the maximum and minimum value selectors for application to the output terminal. Offset producing circuits are coupled to the minimum and maximum value selectors whereby an output signal is produced having a preshoot, an overshoot and a rapid transition therebetween for video input signal transients of either direction and in which the shoot amplitudes are independently controllable thereby providing the combined transition speed advantages of "edge replacement" enhancement systems with pre-shoots and overshoots characteristic of transversal peaking systems.
REFERENCES:
patent: 4041531 (1977-08-01), Bingham
patent: 4729014 (1988-03-01), Flamm et al.
patent: 4758891 (1988-07-01), Hitchcock et al.
patent: 4777385 (1988-10-01), Hartmeier
patent: 4918528 (1990-04-01), Oohashi
Anderson Mark R.
Parker Robert P.
Coalter Richard G.
Emanuel Peter M.
Groody James J.
Miller John W.
Thomson Consumer Electronics Inc.
LandOfFree
Video signal processor employing edge replacement, preshoots and 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 processor employing edge replacement, preshoots and, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Video signal processor employing edge replacement, preshoots and will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-76591