FM RADIO RECEIVER, ESPECIALLY CONCERNED WITH IMPROVING THE PERFORMANCE OF RECEPTION BY PREVENTING NOISE OR INTERFERENCE DUE TO AN INCREASE IN ATMOSPHERIC HUMIDITY

摘要

PURPOSE: An FM radio receiver is provided to improve the performance of reception by applying different filtering bandwidths according to a change in atmospheric humidity and preventing noise or interference due to an increase in atmospheric humidity. CONSTITUTION: A humidity sensor(50) detects the humidity of the atmosphere and inputs it to a microcomputer(60). If the detected humidity is more than 70%, the microcomputer(60) controls an electronic switch to input an IF(Intermediate Frequency) signal to a 70KHz band pass filter. If the detected humidity is in a range of 30% to 70%, the microcomputer(60) controls the electronic switch to input an IF signal to a 100KHz band pass filter. In case that the detected humidity is less than 30%, the microcomputer(60) controls the electronic switch to input an IF signal to a 150KHz band pass filter.