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OwnerRaphael Rahamim, Frank Sacca +1inventors
InventorsRAPHAEL RAHAMIM, FRANK SACCA, THOMAS GREY BEUTLER
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A ring detect/Caller I.D. detect circuit employs first and second operational amplifiers supplied with a differential input from the AC side of a diode bridge. The differential input is converted to a single ended input supplied in a first mode to a ring detect comparator supplied with a plurality of selectable reference voltages and in a second mode to a comparator which produces a digital Caller I.D. output signal. An impedance in the feedback loop of the first and second operational amplifiers is switch-selectable to enable the first and second modes of operation, and each of the selectable reference voltages is chosen to permit proper ring signal detection in a particular corresponding geography.
A telephone line interface circuit comprising:
A method of programmable ring detection comprising the steps of:
A telephone line interface circuit comprising:
A telephone interface circuit comprising:
Dependencies are inferred from the claim text.