Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Patent
1995-03-08
1996-12-03
Metjahic, Safet
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
348638, 348666, 348668, H04N 966, H04N 978
Patent
active
055813070
ABSTRACT:
A video-scrambling system induces a random wobble i.e., time shifting, in the location of active portion of the video frame, without affecting the horizontal sync signal and colorburst in each video line, thus providing both security and concealment. The security is enhanced by filling in the gap between the nominal beginning of active video and the actual beginning of active video with a synthesized video signal which replicates the adjacent active video using a digitally generated filling pattern. Also, a random noise overlay further conceals the location of the gap. Additional concealment is provided by wiggling in time the location of the horizontal sync signal using one or two frequencies and also by randomly altering the location of the vertical sync signal. The NTSC digital encoding in accordance with the invention is simplified by using only two channels, chrominance and luminance, and by a heterodyne circuit for chrominance stability. NTSC encoding is enhanced by providing detail normally lost, by use of the chroma channel. Additionally, a non-standard video signal may be provided with a portion of the colorburst on the front porch of the horizontal blanking, thus allowing use of a relatively simple decoder.
REFERENCES:
patent: 5103296 (1992-04-01), Teichner
patent: 5374964 (1994-12-01), Rzeszewski
Holzgrafe James R.
Ryan John O.
Brill Gerow D.
Metjahic Safet
Murrell Jeffrey S.
LandOfFree
Method and apparatus for scrambling and descrambling of video si does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for scrambling and descrambling of video si, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for scrambling and descrambling of video si will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-789241