Apparatus and method for incoming call detection and alarm circu

Details Apparatus and method for incoming call detection and alarm circu Apparatus and method for incoming call detection and alarm circu

1995-12-14

1998-03-17

Kuntz, Curtis

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

455567, 4552264, 455572, 379376, 379378, H04Q 732

Patent

active

057295891

ABSTRACT:
An apparatus for use with cellular telephone to indicate an incoming telephone call to a user includes a cellular telephone battery pack having 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 powered up state signal whenever the value of the voltage signal increases from a first selected lower value to a first selected higher value for a first preselected period of time. An incoming call detection circuit whenever the powered up state signal is present and either the voltage signal is representative of a selected periodic current transient in the current being drawn by the cellular telephone for a second 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 et al.
patent: 4873712 (1989-10-01), Porco
patent: 4951311 (1990-08-01), Sterr
patent: 4982424 (1991-01-01), Saito et al.
patent: 5025467 (1991-06-01), Wheller
patent: 5224152 (1993-06-01), Harte
patent: 5278995 (1994-01-01), Hwang
patent: 5303284 (1994-04-01), Shinozaki
patent: 5404391 (1995-04-01), Wavroch et al.
patent: 5651052 (1997-07-01), Serrano

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