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An automobile telephone device uses as its power source a battery for the automobile. This applies to an automobile telephone device with an automatic answering or receiving function. In the automobile telephone device, a voltage monitoring unit monitors the voltage of the battery. When the voltage

An automobile telephone device uses as its power source a battery for the automobile. This applies to an automobile telephone device with an automatic answering or receiving function. In the automobile telephone device, a voltage monitoring unit monitors the voltage of the battery. When the voltage falls near a limit voltage required for starting the automobile engine, the monitoring unit electrically interrupts a power source line connecting the battery and the telephone device via a proper switch circuit to thereby inhibit excessive consumption of the automobile battery by the automatic answering or receiving function during engine stoppage.

대표청구항 ▼

A control device coupled to a battery and a radio telephone apparatus for controlling a power supply from the battery to the radio telephone apparatus, comprising: detecting means coupled to the battery for detecting a decrease of a predetermined output voltage of the battery; and control means resp

A control device coupled to a battery and a radio telephone apparatus for controlling a power supply from the battery to the radio telephone apparatus, comprising: detecting means coupled to the battery for detecting a decrease of a predetermined output voltage of the battery; and control means responsive to the detecting means for interrupting the power supplied to the radio telephone apparatus in response to the detection of the decrease of the predetermined output voltage at times when a radio communication link is not established between the radio telephone apparatus and another radio telecommunication apparatus, the control means being responsive to the detection of the decrease of the predetermined output voltage for postponing the interruption of the power supplied to the radio telephone apparatus at times when the radio communication link is established between the radio telephone apparatus and another radio telecommunication apparatus, until the radio communication link is terminated.