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Image control device for use in a video multiplexing system for superimposition of scalable video data streams upon a background video data stream

  • US 5,793,439 A
  • Filed: 02/20/1997
  • Issued: 08/11/1998
  • Est. Priority Date: 07/13/1988
  • Status: Expired
First Claim
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1. An image control device for use in a computer system having a microprocessor, a bus coupled to said microprocessor, a video memory coupled to said bus, and a display device, said image control device comprising:

  • write control means coupled to said bus for controlling the writing of an image signal into said video memory by supplying a write address to said video memory; and

    first read control means coupled to said video memory and said display device, for controlling the reading of an image signal of a motion picture out of said video memory in synchronism with a synchronizing signal which is supplied to said display device along with said motion picture image signal; and

    second read control means coupled to said video memory and said bus, for controlling the reading of an image signal out of said video memory while said first read control means executes the reading of said motion picture image signal.

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