Abstract: Disclosed is a dead zone monitoring system for monitoring the dead zone of a vehicle. The dead zone monitoring system includes a photographing device disposed on the front pillar for photographing a dead zone of a driver caused by the front pillar of the vehicle; an image controller connected with the photographing device for analyzing, transforming and processing an information image that is photographed by the photographing device; and a display device connected with the image controller by using an imagery signal cable for displaying the information image provided from the image controller. The photographing device can be an optical lens, and the imagery signal cable can be also an optical cable. The display device can be an optical monitor.

Abstract: A vehicle hands-free unit is incorporated in an assist handle, which is mounted at a side of a driver's seat for listening a voice of the other party, and includes a front part mounted with a speaker, a secret conversation button for transmitting telephone call signals to an ear microphone for personal telephone call, a reproduction button for reproducing recorded conversation contents, a recording button for partially recording conversation contents, a conversation button for receiving a telephone call, a side part mounted with a microphone sound level control lever for controlling a microphone level, a microphone connection jack for alternatively connecting the ear microphone, a sound level control lever for controlling the sound level of receiving, a microphone for converting sound signals to electric signals to be transmitted to the other party, and an interior part mounted with a main board including a voice recognition controller, a recording control part, a car stereo control part, a digital signal pro

Abstract: An automatic gain controlling mechanism of radio frequency amplifier for a glass antenna in a car audio system includes a radio frequency amplifier, an FM front end part used as a tuner, an FM detector/multiplexer, a volume controller and a voltage amplifier. The radio frequency amplifier is gain-variable. A microprocessor is connected to a voltage level output terminal of the FM detector/multiplexer at the data input terminal for receiving a voltage level signal detected by the FM detector/multiplexer and determining an intensity of an electric field intensity. The microprocessor is also connected to a gain variable terminal of the RF amplifier at the output terminal for transmitting a gain controlling signal to the RF amplifier. Thus, the increase or decrease of the gain of the radio frequency amplifier is automatically controlled.