Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent
1995-07-25
1997-06-10
Kuntz, Curtis
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Testing of subscriber loop or terminal
379 1, 379 33, 379372, 379374, 379376, 379387, 379396, 455127, 455343, H04M 124, H04M 322, H04M 100, H04M 900
Patent
active
056384211
ABSTRACT:
An apparatus and method for indicating an incoming call that generates a voltage signal with a value representative of the current drawn by operation of the device. A circuit monitors the voltage signal and generates a waiting for call state signal whenever the value of the voltage signal decreases from a first selected higher value to a first selected lower value for a first preselected period of time. An RF detection circuit monitors the status of the device's transmitter and generates a transmitter active status signal whenever RF appears for a selected period of time. An incoming call detection circuit generates an alarm start signal whenever the waiting for call state and transmitter active status signals are present and either the voltage signal increases from a second selected lower value to a second selected higher value and remains at or above the second selected higher value for a second preselected period of time, or the current goes from a lower preselected current value to a higher preselected current value and remains at or above the higher current value for a third preselected period of time. An alarm, operative upon receipt of the alarm start signal, indicates an incoming call to a user. A circuit monitors the battery voltage and disables the apparatus whenever the battery voltage drops below a preselected cutoff value to avoid damage to the battery.
REFERENCES:
patent: 4677656 (1987-06-01), Burke
patent: 4873712 (1989-10-01), Porco
patent: 4951311 (1990-08-01), Sterr
patent: 5025467 (1991-06-01), Wheller
patent: 5224152 (1993-06-01), Harte
patent: 5243640 (1993-09-01), Hadley
patent: 5278995 (1994-01-01), Hwang
patent: 5404391 (1995-04-01), Wavroch
Avitan Asher
Serrano Arthur
Jodziewicz Matthew F.
Kuntz Curtis
ORA Electronics, Inc.
Shankar Vijay
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