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Method for bidirectionally transmitting digital video signal and digital video signal bidirectional transmission system

  • US 5,978,651 A
  • Filed: 04/14/1997
  • Issued: 11/02/1999
  • Est. Priority Date: 12/28/1993
  • Status: Expired due to Term
First Claim
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1. A first video appliance for use with a second video appliance, said first video appliance being coupled to said second video appliance via a transmission path when said first video appliance is being used with said second video appliance to enable digital signals containing at least digital video signals and digital audio signals to be bidirectionally transmitted and received in substantially real time between said first video appliance and said second video appliance via said transmission path, said first video appliance and said second video appliance each including a transmitting and receiving apparatus, said first video appliance comprising:

  • means for producing a first digital signal by time-division multiplexing at least a first digital video signal and a first digital audio signal;

    means for compressing a first information amount of said first digital video signal in said first digital signal to produce a first compressed digital signal, dividing said first compressed digital signal into a plurality of predetermined periods, and time-axis compressing said first compressed and divided digital signal in order to produce a first compressed, divided, and time-axis compressed digital signal repeating a signal period and a no signal period alternately;

    means for transmitting said first compressed, divided, and time-axis compressed digital signal to said second video appliance through said transmission path;

    means for controlling said transmitting and receiving apparatus of said first video appliance to generate a first transmission period and a second transmission period alternately on said transmission path, said first transmission period being longer than said second transmission period, and controlling said transmitting means of said first video appliance so that said first compressed, divided, and time-axis compressed digital signal of said first video appliance is synchronized with said first transmission period and transmitted to said second video appliance in said first transmission period of said transmission path;

    means for receiving a second compressed, divided, and time-axis compressed digital signal from said second video appliance;

    means for time-axis expanding said second compressed, divided, and time-axis compressed digital signal to reproduce a second digital signal; and

    means for separating said time-axis expanded second digital signal to reproduce at least a second digital video signal and a second digital audio signal.

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