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Telephone ring detector

  • US 5,544,241 A
  • Filed: 06/27/1995
  • Issued: 08/06/1996
  • Est. Priority Date: 06/27/1995
  • Status: Expired due to Fees
First Claim
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1. A telephone ring detector for detecting a ring signal voltage, said ring detector comprising:

  • a voltage threshold setting device for establishing a voltage threshold and providing an output signal when said ring signal voltage exceeds said voltage threshold; and

    a microprocessor responsive to said voltage threshold setting device, said microprocessor capable of measuring a time duration of said output signal and comparing said time duration with a predetermined time interval value, said microprocessor outputting a ring detection signal when said time duration exceeds said predetermined time interval value, said predetermined time interval being less than a ring cycle of said ring signal voltage.

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