| 摘要 |
PURPOSE: A car audio which is multi-composed radio frequency signal for FM broadcasting is provided to reduce noise mixed in radio frequency signal and to improve the receiving performance of a car audio. CONSTITUTION: While an FM tuner unit(10) receives the RF signal for FM broadcasting through an antenna plug(11) and an antenna jack(12) connected with an antenna, the FM tuner unit(10) modulates IF signal into AM, buffers and outputs it, according to the result by discriminating whether the area receiving the RF signal for FM broadcasting is a multipath area. An antenna adjustor unit(20) amplifies the RF signal for FM broadcasting received by a plurality of antennas through multiplex synthesization, according to the result discriminating the IF signal supplied from the FM tuner unit(10). Then, the antenna adjustor unit(20) supplies it to the FM tuner unit(10) through the antenna plug(11) and the antenna jack(12).
|
