Apparatus and method for incoming call detection and alarm circu

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal

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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

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