×

Adaptive signal receiving method and apparatus

  • US 4,460,808 A
  • Filed: 08/23/1982
  • Issued: 07/17/1984
  • Est. Priority Date: 08/23/1982
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of adapting the amplitude sensitivity of a telephone system tone signal receiver to successive tone signals received from telephone stations on a per call basis, in which the receiver has an initial amplitude range for valid tone signals, said method BEING CHARACTERIZED BY the steps ofascertaining the amplitude of a first valid tone signal received during a call, andnarrowing the initial amplitude range according to a prescribed algorithm based on the amplitude of the first valid tone signal for validating succeeding tone signals received during the call.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×