CIRCUIT AND METHOD TO REDUCE RASTER MOIRE
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United States of America Patent
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Issued Date -
Apr 25, 2002
app pub date -
Sep 8, 1998
filing date -
Sep 8, 1998
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A display raster cancellation system using a microprocessor and associated program is disclosed to control moir pattern appearance on the display's screen. The program of microprocessor (126) controls a signal that is applied to a moir circuit (130). Input to the microprocessor may be data obtain from the system's video input signal. A synch separator (120) may output horizontal pulses and vertical pulses obtained from the video signal. The following three functions may be performed on the video signal: interlace-progressive (I/P) discrimination (122), scan rate discrimination (124), and vertical resolution discrimination (125). The system may be used for standard television sets, digital television units, computer monitors or other raster display systems. The system may have the I/P, scan rate and vertical resolution input directly to the microprocessor (127) from an external video source via certain control signals.
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