Supervision and dial pulse detection circuit for a telephone...

Details Supervision and dial pulse detection circuit for a telephone... Supervision and dial pulse detection circuit for a telephone...

H - Electricity

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379/57

H04M 3/22 (2006.01) H04M 19/00 (2006.01) H04Q 1/32 (2006.01)

Patent

CA 1206643

SUPERVISION AND DIAL PULSE DETECTION CIRCUIT FOR A TELEPHONE SUBSCRIBER LINE by CONSTATINE VICTOR SKIDANENKO AND GREGOR DONALD MCGIBBON ABSTRACT OF THE DISCLOSURE A floating battery feed circuit employs a single primary winding, a pulse width control circuit and a peak detector for provid- ing a controlled current to a subscriber loop. The amplitude of the controlled current is determined by the loop resistance. A comparator circuit has one input connected to the output or a peak detector via a breakdown diode. The second comparator input is connected to a refer- ence voltage. When the voltage from the breakdown diode exceeds a pre- determined value the comparator provides a 0 output to indicate an on-hook state. For a peak detector output voltage below said predeter- mined value, the comparator provides a +5 volt output indicating an off-hook state. -18-

443088

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