Video multiplexing system for superimposition of scalable video data streams upon a background video data stream

Patent 5929870 Issued on July 27, 1999. Estimated Expiration Date:

February 20, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventor

Takeuchi, Kesatoshi

Assignee

Seiko Epson Corporation

Application

No. 803108 filed on 02/20/1997

US Classes:

345/531, Graphic display memory controller345/536Plural storage devices

Examiners

Primary: Nguyen, Chau

Attorney, Agent or Firm

Oblon, Spivak, McClelland, Maier & Neustadt, P.C.

Foreign Patent References

52115121 JP. 09/21/1977
54-112122 JP. 09/21/1979
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International Class

G09G 005/00

Foreign Application Priority Data

1988-07-13 JP

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.

Other References

Abstract: Tellevision Receiver -p. 167 E 568 Abstract: Picture Processing Device -p. 10 P 798 Abstract: Picture Processor -P. 90 P 815 1988 National Convention Record of the Institute of Television Engineers of Japan (total of 4 pages)
IEICE Technical Report, vol. 88, No. 300 (total of 8 pages), dated Nov. 25, 1988 Abstract: Partial Abstract for Japanese Patent Laid-Open Gazette No. 60-4659