Computer graphics processing and selective visual display system – Computer graphic processing system – Integrated circuit
Patent
1997-02-20
1999-07-27
Nguyen, Chanh
Computer graphics processing and selective visual display system
Computer graphic processing system
Integrated circuit
345516, G09G 500
Patent
active
059298707
ABSTRACT:
A video multiplexing system for superimposition scalable video data streams upon a background data stream has a video decoder to extract a first luminance signal, an A/D converter to converter the first luminance signal to digital form, a three-port video memory for storing the digitized luminance signal, a D/A converter for receiving the stored digitized luminance signal and converting it to analog form, a mixing, or multiplexing circuit, having one input coupled to the D/A converter output, at least one other luminance signal source as an input and control inputs for directing the selection of one of the input luminance signals as an output, and a control circuit such as a microprocessor for controlling the various components. The write operations to the video memory are synchronized to the incoming luminance signal, and the read operations from video memory are synchronized to the display device. This video multiplexing architecture provides the ability to open a view port of arbitrary size at any position within a larger display. Scaling of the digitized luminance signal to fit an a view port of arbitrary size is archived by varying the frequency of the A/D converter clocks so as to expand or shrink the resulting image.
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Nguyen Chanh
Seiko Epson Corporation
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