Abstract: A mobile terminal having a bluetooth module is disclosed. The mobile terminal comprising an input unit positioned on the terminal for receiving outside sound signals and a codec positioned between the bluetooth module and the input unit can be connected to A/V devices to receive sound wirelessly.

Abstract: A delay and inverting circuit, connected to the car phone system, is for delaying a status of operation of the car phone system and inverting a signal having a predetermined signal level according to the operation of the car phone system. A switching circuit, connected to the delay and inverting circuit, is for effecting a switching operation in accordance with a signal generated from the delay and inverting circuit. An amplifier, connected to the switching circuit and the car audio system, is for amplifying an output signal generated from the switching circuit and generating a driving signal to the car audio system.

Abstract: The present invention provides a car-mounted booster system comprising a first coupler, connected to the first duplexer and the power module, which regulates an output of the first duplexer; a first amplifier connected to the first coupler; an A/D converter connected to the first amplifier, which converts the analog output signal from the first amplifier to a predetermined digital code, and generates a transmission verification signal for verification of a fact whether the output signal from the first amplifier is a transmission signal or not; a second coupler connected to the second duplexer and the power module, which regulates an output of the second duplexer; a second amplifier connected to the second coupler; and a D/A converter connected to the A/D converter, the second amplifier, and the power module, which generates a control signal to control the power module according to a comparison result after comparison between a signal level from the second amplifier and a signal level from the A/D converter, a