Supervision and dial pulse detection circuit for a telephone sub

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

1982-12-13

1985-08-20

Rubinson, Gene Z.

H04M 322

Patent

active

045366144

ABSTRACT:
A floating battery feed circuit employs a single primary winding, a pulse width control circuit and a peak detector for providing 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 of a peak detector via a breakdown diode. The second comparator input is connected to a reference voltage. When the voltage from the breakdown diode exceeds a predetermined value the comparator provides an 0 output to indicate an on-hook state. For a peak detector output voltage below said predetermined value, the comparator provides a +5 volt output indicating an off-hook state.

REFERENCES:
patent: 3916114 (1975-10-01), Persson
patent: 3935392 (1976-01-01), Smith et al.
patent: 4326104 (1982-04-01), Bergida
patent: 4402039 (1983-08-01), Jirka
patent: 4429186 (1984-01-01), Gartner
patent: 4458112 (1984-07-01), Svala

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