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Telephone interface for a computer for receiving and transmitting information during the silent interval between ringing

  • US 5,117,452 A
  • Filed: 09/27/1990
  • Issued: 05/26/1992
  • Est. Priority Date: 09/29/1989
  • Status: Expired due to Fees
First Claim
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1. A telephone interface apparatus for connecting a computer external to the interface apparatus to a telephone line for use in telephone systems employing information signalling during the silent interval between rings comprising:

  • line interface means for interfacing the apparatus with the telephone line,first computer interface means for interfacing the apparatus with a computer external to the interface apparatus,ring detector means for detecting a ringing signal upon the telephone line,data demodulation means connected with the line interface means and with the first computer interface means for receiving data transmitted over the telephone line during a silent interval after a ringing signal, andcontrol logic means for controlling flow of the data between the data demodulation means and the first computer interface means in response to a signal from the ring detector means whereby in operation data present on the telephone line during the silent interval is retransmitted through the first computer interface means to the computer external to the interface apparatus.

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