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Communication system

  • US 4,031,543 A
  • Filed: 03/11/1974
  • Issued: 06/21/1977
  • Est. Priority Date: 03/11/1974
  • Status: Expired due to Term
First Claim
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1. A communiction system comprisinga central station and a plurality of remote stations,a program transmitter at said central station for transmitting program signals representing said programs to all of said remote stations,second means at each of said remote stations for transmitting information signals to said central station at generally regular but random intervals whereby a relatively large number of remote stations can communicate with a central station without said information signals interfering with each other, said second means including a signal transmitter, switch means for turning on said transmitter at generally regular but slightly random intervals, and a summing amplifier coupled to said switch means,said summing amplifier being adapted to be charged to a predetermined voltage level at which it operates and switch means, anda plurality of signal-generating means coupled to said summing amplifier including means for selecting portions of said program signals, a ramp voltage generator, and a random signal generator.

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