Telephone handset detector

Details Telephone handset detector Telephone handset detector

1985-11-20

1987-06-09

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379387, 379214, H04M 100, H04M 358, H04M 908

Patent

active

046726632

ABSTRACT:
An electronic telephone handset detector, for generating an output signal to an external controller indicative of a telephone handset being connected to or disconnected from a subscriber's set. A microphone input terminal is connected to a source of direct current such that in the event the microphone is connected to the terminal, direct current flows therethrough. A comparator circuit, connected in a circuit to the microphone input terminal, detects the current flowing through the microphone from the source of direct current and generates the aforementioned output signal in response thereto.

REFERENCES:
patent: 3851111 (1974-11-01), Young
patent: 4449017 (1984-05-01), Burke et al.
patent: 4499337 (1985-02-01), Elbaek
patent: 4562310 (1985-12-01), Watters et al.

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