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System for controlling signal level at both ends of a transmission link based on a detected valve

  • US 5,321,849 A
  • Filed: 05/22/1991
  • Issued: 06/14/1994
  • Est. Priority Date: 05/22/1991
  • Status: Expired due to Term
First Claim
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1. A system for controlling the amount of noise introduced into a transmit signal adapted to be transmitted over a transmission link within a communication path, the transmission link extending from a first location to a second location remote from the first location, said system comprising:

  • control means for detecting, at an initial position along the communication path, the level of the transmit signal, and for controlling first signal level changing means and second signal level changing means in response to the detected level;

    said first signal level changing means comprising means for changing the level of said transmit signal before transmission over said link, and said second signal level changing means comprising means for changing the level of said transmit signal after transmission over said link, said control means controlling said first and second signal level changing means to change the level of said transmit signal in a coordinated fashion based on the detected level;

    said first and second signal level changing means respectively comprising first and second outputs and means for changing the level of the transmit signal present at said first and second outputs; and

    said control means comprising means for controlling said first and second signal level changing means so that;

    the transmit signal level is decreased at the first output and increased at the second output when the detected transmit signal level increases, andthe transmit signal level is increased at the first output and decreased at the second output when the detected transmit signal level decreases.

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