Television – Synchronization – Sync separation
Reexamination Certificate
2005-03-22
2005-03-22
Natnael, Paulos M. (Department: 2614)
Television
Synchronization
Sync separation
C348S529000, C370S536000
Reexamination Certificate
active
06870569
ABSTRACT:
An integrated circuit with a signal demultiplexor for separating out two signals of different magnitudes from within a multiplexed signal without requiring a large capacitance for signal filtering. A multiple-threshold input comparator stage separates the multiplexed input signal into a first fully demultiplexed signal and a first partially demultiplexed signal. The first fully and partially demultiplexed signals are logically processed in an Exclusive-OR gate to produce a second partially demultiplexed signal which is then time-delayed and gated by the first fully demultiplexed signal. The resultant gated signal is low pass filtered to produce a second fully demultiplexed signal. In a video signal application, the multiplexed input signal would be a “sandcastle” signal containing both horizontal clamp and vertical synchronization signals, with the horizontal clamp signal component being greater in magnitude than the vertical synchronization signal component, and the resulting first and second fully demultiplexed signals would be the separated horizontal clamp and vertical synchronization signals, respectively.
REFERENCES:
patent: 4680622 (1987-07-01), Barnes et al.
patent: 5161117 (1992-11-01), Waggener, Jr.
patent: 5351129 (1994-09-01), Lai
patent: 5537148 (1996-07-01), Fujinami
patent: 5734283 (1998-03-01), Hedberg
patent: 5974055 (1999-10-01), Imanishi
patent: 6064443 (2000-05-01), Lee
patent: 6111897 (2000-08-01), Moon
patent: 6246439 (2001-06-01), Zink et al.
patent: 6650371 (2003-11-01), Morrish et al.
patent: 6788711 (2004-09-01), Sumioka
“150 MHz Video Controller with 12c-bus Data Sheet.” Philips Semiconductors, pp 1-55, Nov. 25, 1997.
National Semiconductor Corporation
Natnael Paulos M.
Vedder Price Kaufman & Kammholz P.C.
LandOfFree
Integrated multilevel signal demultiplexor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Integrated multilevel signal demultiplexor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Integrated multilevel signal demultiplexor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3409961