초록 ▼

An improved hand-free system for use on a cellular phone, and more particularly one hand-free system can prevent an automatically-operated antenna of a vehicle's audio stereo system from being unnecessarily actuated in response to incoming signals of a cellular phone. As a cellular phone is receivin

An improved hand-free system for use on a cellular phone, and more particularly one hand-free system can prevent an automatically-operated antenna of a vehicle's audio stereo system from being unnecessarily actuated in response to incoming signals of a cellular phone. As a cellular phone is receiving incoming signals, a vehicle's audio stereo system in operation is automatically turned off or become mute, and the received voice signals of the cellular phone are amplified and broadcast via speakers of the vehicle's audio stereo system. At the same time, the antenna of the vehicle's audio stereo system remains in its current status without being actuated till the end of the operation of a cellular phone; afterwards, the audio stereo system is automatically started again. Thereby, it not only advances the quality of communication of a cellular phone and driving safety of a vehicle but also make the operation life of an antenna of a vehicle effectively extended by reducing the number of unnecessary extensions and retractions of the antenna in use.

대표청구항 ▼

[ I claim:] [1.]1. A hand-free system for use on a cellular phone being operated in combination with a vehicle's audio stereo system, capable of preventing a vehicle's automatically operated antenna from being randomly extended or retracted in correspondence to operation conditions of a cellular pho

[ I claim:] [1.]1. A hand-free system for use on a cellular phone being operated in combination with a vehicle's audio stereo system, capable of preventing a vehicle's automatically operated antenna from being randomly extended or retracted in correspondence to operation conditions of a cellular phone, comprising an electronic switch, a power source and charging circuitry, an amplifier and acoustic quality processing circuitry, an acoustic source control CPU and an antenna controlling circuitry, and said operating in cooperation with an antenna of a vehicle; wherein said hand-free system is characterized by that when a cellular phone is receiving incoming signals, said acoustic source control CPU will transmit a control signal to said antenna control circuitry which detects the antenna being lifted or lowered first and then send off a relay responsible for control of a lifting or lowering operation on said antenna to maintain said relay in operation; till said cellular phone terminates its communication operation, control of said antenna is returned to said vehicle's audio stereo system whereby said antenna is protected from being randomly extended and retracted in response to turn-on and turn-off operations of said vehicle's audio stereo system.