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Digital video effect system comprising only one memory of a conventional capacity

  • US 4,218,710 A
  • Filed: 05/08/1979
  • Issued: 08/19/1980
  • Est. Priority Date: 05/15/1978
  • Status: Expired due to Term
First Claim
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1. In a digital video effect system responsive to a plurality of individually synchronized input television signals and a reference timing signal comprising horizontal and vertical synchronizing pulses as said television signals do, for producing a mixed television signal phase-locked to said timing signal and representing a picture composed of predetermined areas of the respective pictures represented by said input television signals, said system comprising address signal producing means responsive to said input television and said timing signals for producing corresponding sequences of horizontal and vertical address signals with the horizontal and the vertical address signals of each sequence synchronized with the horizontal and the vertical synchronizing pulses of the corresponding one of said input television and said timing signals, converter means operatively coupled to said address signal producing means for converting said input television signals to corresponding sequences of digital video signals with the video signal sequences thus made to correspond to first ones of said address signal sequences that correspond to said input television signals and with the digital video signals of each video signal sequence synchronized with the horizontal address signals of the corresponding one of said first sequences, and memory means having a plurality of addresses for memorizing the digital video signals of said video signal sequences in the memory means addresses specified by the horizontal and the vertical address signals of said first sequences and for producing the digital video signals memorized in the memory means addresses specified by the horizontal and the vertical address signals of a second one of said address signal sequences that corresponds to said timing signal to derive said mixed television signal, the improvement wherein said memory means comprises:

  • mixing means responsive to the horizontal address signals of a prescribed one of said first and said second sequences for mixing the digital video signals of said video signal sequences and the vertical address signals of said first sequences into mixed digital video and vertical address signals phase-locked to the horizontal address signals of said prescribed sequence and composed of the digital video signals of said video signal sequences and the vertical address signals of said first sequences; and

    a memory having a plurality of memory addresses for memorizing said mixed digital video signals in the memory addresses specified by the horizontal address signals of said prescribed sequence and said mixed vertical address signals and for producing the mixed digital video signals memorized in the memory addresses specified by the horizontal and the vertical address signals of said second sequence to derive said mixed television signal.

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