Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1995-03-03
1997-07-22
Kuntz, Curtis
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
4552264, 455572, 379376, 379378, H04Q 732
Patent
active
056510527
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.
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Alliance Research Corporation
Jodziewicz Matthew F.
Kuntz Curtis
Trost William G.
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