Apparatus for cordless computer telephony

  • US 6,731,751 B1
  • Filed: 08/08/2000
  • Issued: 05/04/2004
  • Est. Priority Date: 06/27/2000
  • Status: Active Grant
First Claim
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1. A computer telephony system comprising a personal computer having at least one external digital port, a telephone set, and interface apparatus interposed between said computer and said telephone to transmit and receive voice signals, said interface apparatus comprising:

  • an impedance setting circuit to emulate Central Office connection with respect to said telephone;

    a loop current feed circuit to enable operation when said telephone is in off hook condition;

    a two to four wire conversion circuit to separate telephone transmit voice signal from receive voice signal;

    a codec circuit to perform analog to digital conversion on said transmit signal and digital to analog conversion on said receive signal;

    digital interface circuit to enable the exchange of said digitized transmit and receive signals between said codec and said computer external digital port; and

    a DC power circuit wherein said loop current is obtained from said digital port.

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