Television – Image signal processing circuitry specific to television – Special effects
Patent
1996-03-22
1998-09-01
Grant, Chris
Television
Image signal processing circuitry specific to television
Special effects
348584, H04N 5262
Patent
active
058017895
ABSTRACT:
A system for overlaying digital character signals on an analog video source signal including a predetermined color subcarrier includes a digital character generating device, a digital video encoder, and a switching device. The digital character generating device detects horizontal and vertical timing of pixel information in the analog video source signal, and generates digital character signals that are to be overlaid in predetermined pixels of the analog video source signal. The digital video encoder is responsive to the color subcarrier signal for generating a separate color subcarrier which is locked to the predetermined color subcarrier of the analog video source signal. The digital video encoder also converts the digital character signals from the digital character generating device into an analog video output signal that includes the color subcarrier generated in the digital video encoder. The swithching device directs the analog video output signal from the digital video encoder or the analog video source signal to an output of the system during pixels times when a digital character is to be overlaid or not overlaid, respectively, on the analog video source signal.
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An Article entitled "A Low Cost, General Purpose S-Video, PAL/NTSC Encoder" by G.W. Perkins et a., published in IEEE/transactions onConsumer Electronics, vol. 38,No. 3 Aug., 1992.
Simons Robert M.
Zeidler David E.
Zhu Qiang
General Instrument Corporation
Grant Chris
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