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DUPLEX CABLE COMMUNICATIONS NETWORK EMPLOYING AUTOMATIC GAIN CONTROL UTILIZING A BAND LIMITED NOISE AGC PILOT

  • US 3,835,393 A
  • Filed: 04/17/1972
  • Issued: 09/10/1974
  • Est. Priority Date: 04/17/1972
  • Status: Expired due to Term
First Claim
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1. In combination in a cable television bidirectional signal propagating system wherein plural first system signal propagating channels converge into a second system signal propagating channel at a convergence point for conveying signals in a cable network in a reverse direction toward a cable system head end, at least one variable gain repeater amplifier included in each of said first and second system signal propagating channels, means for supplying a prescribed frequency band of noncoherent noise signals to the input of said repeater amplifier in each of said first signal propagating channels, and automatic gain control circuit means included in each of said repeater amplifiers for adjusting the gain of the associated repeater amplifier responsive to the amplitude of the noise signal at said amplifier.

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