Patent ID: 8699980
Filing Date: 2014-04-15
Classification: H01Q,H04B

Abstract:
1. A car audio system having a tuner unit and an active antenna integrated into a single module, the car audio system being connected to an antenna for a vehicle and receiving broadcast signals, the system comprising: an antenna-tuner integration module, in which the active antenna for receiving and amplifying the broadcast signals and the tuner unit for selecting a broadcast signal corresponding to a specific frequency among the received broadcast signals are formed as a single module; and a car audio device connected to the antenna-tuner integration module using a data cable of a certain length corresponding to a spaced distance for preventing effects of electrical noise generated by the vehicle, wherein the antenna-tuner integration module includes: the active antenna containing an antenna matching unit for matching impedance of the vehicle antenna for receiving the broadcast signals to impedance of an internal circuit and a low noise amplification unit for amplifying the broadcast signals inputted through the antenna matching unit; and the tuner unit arranged near the low noise amplification unit to prevent degradation of receive sensitivity and select a broadcast signal corresponding to a specific frequency among the broadcast signals received from the low noise amplification unit, and wherein the tuner unit includes: a front end for converting the broadcast signals received from the low noise amplification unit into an intermediate frequency, amplifying the broadcast signals and outputting a signal meter value in order to adjust a gain value of the low noise amplification unit; a PLL unit for transferring a frequency tuning voltage to a tuning circuit of the antenna matching unit so that the broadcast signals inputted into the low noise amplification unit may have a maximum value; an analog demodulation unit for demodulating the broadcast signals passing through the front end and extracting voice signals; and a power supply for receiving operation power from the car audio device.