Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent
1995-05-08
1997-06-17
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
056404417
ABSTRACT:
An apparatus for use with a cellular telephone to indicate an incoming telephone call to a user includes a cellular telephone battery pack has a circuit that generates a voltage signal with a value representative of the current being drawn from the battery by the operation of the cellular telephone. A status determination 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 incoming call detection circuit whenever the waiting for call state signal is 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 is operative upon receipt of the alarm start signal for indicating an incoming call to a user. Also a cutoff circuit monitors the voltage of the battery and disables the apparatus further operation 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
Oraelectronics, Inc.
Shankar Vijay
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