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Squelch and message storage system and method

  • US 4,479,153 A
  • Filed: 05/09/1979
  • Issued: 10/23/1984
  • Est. Priority Date: 07/23/1976
  • Status: Expired due to Term
First Claim
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1. A squelch system comprising;

  • (a) means for determining if a signal is present, including hang time means,(b) means for delaying a signal using an electromechanical recording system said means delaying the signal for a period of time approximately equal to the hang time of the signal presence determining means,(c) means for rapidly muting sounds when the signal presence determining means hang time period is completed indicating that signal is no longer present, and,(d) means controlled by signal presence determining means for stopping the motion of the recording medium in a period equal to or greater than the approximate hang time of the squelch circuit so as to ensure that at least most of the noise tails that may be present at the input to the squelch system are not present at the output of the squelch system during subsequent transmissions.

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