Telephone controlled interrupter circuit

Details Telephone controlled interrupter circuit Telephone controlled interrupter circuit

1988-05-19

1989-10-10

George, Keith E.

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

379441, 455 88, H04Q 704, H04M 1100

Patent

active

048737127

ABSTRACT:
A control unit is inserted in the power lines that serve a vehicular telephone and an audio system. A power monitoring circuit detects current increases related to operation of the telephone, either from an incoming "ring" signal or the "off hook" condition in preparation for an outgoing call. The monitoring circuit generates a control signal which is applied to an electronic switching circuit that interrupts the flow of power to the audio system circuits. So long as the telephone is in use, the audio system is disabled. When the telephone returns to the quiescent or stand-by state, the current drawn by the telephone drops substantially below a threshold level of the monitoring circuit and the switching circuit restores the power to the audio system.

REFERENCES:
patent: 1909843 (1933-05-01), Squire
patent: 3868571 (1975-02-01), Greiner
patent: 3971985 (1976-07-01), Arai
patent: 4027249 (1977-05-01), Calman
patent: 4389543 (1983-06-01), Granier et al.
patent: 4524461 (1985-06-01), Kostanty et al.
patent: 4591661 (1986-05-01), Benedetto et al.
Installation News, Apr., 1988, pp. 40-41, "Device Adds Profit to Cellular Installs, Turns Off Radio for Incoming, Outgoing Calls".

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