| 摘要 |
PROBLEM TO BE SOLVED: To provide an IF band control system of an FM radio tuner which is hardly affected by adjacent interference. SOLUTION: The IF band control system includes: an antenna for receiving radio waves of FM broadcasting, a radio tuner for desired station reception which receives a broadcast signal of a desired station from the antenna, and a radio tuner for adjacent interference detection for receiving a broadcast signal of an adjacent station that uses a frequency different from the frequency of the broadcast signal of the desired station by a predetermined frequency step from the antenna, wherein the radio tuner for desired station reception has an IF band control unit for controlling an IF band for receiving a broadcast signal of the desired station, the radio tuner for adjacent interference detection has an adjacent station modulation factor detection unit and an adjacent station signal strength detection unit, and the IF band control unit controls the IF band by setting an IF band in which the broadcast signal of the desired station can be received without receiving interference by the broadcast signal of the adjacent station on the basis of the modulation factor and the signal strength of the broadcast signal of the adjacent station. COPYRIGHT: (C)2011,JPO&INPIT
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