Apparatus, systems and methods for controlling data overlay in multimedia data processing and display systems using mask techniques

  • US 5,977,960 A
  • Filed: 09/10/1996
  • Issued: 11/02/1999
  • Est. Priority Date: 09/10/1996
  • Status: Expired due to Term
First Claim
Patent Images

1. An overlay control system comprising:

  • a frame buffer for storing words of graphic data, words of video data and an overlay control mask;

    mask generation circuitry for generating said overlay control mask for storage in said frame buffer from a mask object, said mask object having fewer bits than said overlay control mask; and

    mask controlled overlay selection circuitry operable in response to bits of said overlay control mask retrieved from said frame buffer to selectively retrieve and output words of said video data stored in said frame buffer.

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