Television – Basic receiver with additional function – For display of additional information
Patent
1994-01-24
1995-02-07
Kostak, Victor R.
Television
Basic receiver with additional function
For display of additional information
348552, H04N 5262
Patent
active
053879457
ABSTRACT:
A video multiplexing system for superimposition of scalable video data streams upon a background data stream has a video decoder to extract a first luminance signal, an A/D converter to convert 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 means, 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 means 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 viewport of arbitrary size at any position within a larger display. Scaling of the digitized luminance signal to fit an a viewport of arbitrary size is achieved by varying the frequency of the A/D converter clocks so as to expand or shrink the resulting image.
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Kostak Victor R.
Seiko Epson Corporation
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