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Differential compensation control for off-premises CATV system

  • US 5,345,504 A
  • Filed: 11/28/1990
  • Issued: 09/06/1994
  • Est. Priority Date: 03/10/1988
  • Status: Expired due to Term
First Claim
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1. An automatic slope control apparatus for use in an interdiction cable television system which automatically corrects amplitude distortions as a function of frequency of a broadband television signal transmitted to a subscriber through a cable, the slope control apparatus comprising:

  • a variable impedance circuit responsive to a control input signal for adjusting the amplitude of the broadband television signal as a function of frequency;

    a first bandpass filter for receiving the broadband television signal from the output of said variable impedance circuit and for outputting a first filtered portion thereof;

    a first level detector for detecting the power level of the first filtered portion of the broadband television signal;

    a second bandpass filter for receiving the broadband television signal from the output of said variable impedance circuit and for outputting a second filtered portion thereof;

    a second level detector for detecting the power level of the second filtered portion of the broadband television signal;

    an error amplifier for outputting said control input signal to said variable impedance circuit representative of the difference in power level between said first detected power level and said second detected power level.

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