METHOD AND APPARATUS FOR RADIO RECEPTION, AND MEDIUM

摘要

A desired signal is demodulated while rejecting interference from adjacent signals. A frequency converter circuit 4 converts an input signal to a first intermediate-frequency signal of a first intermediate frequency 57 MHz higher than the frequency of the signal to be demodulated. A frequency converter circuit 8 converts the first intermediate-frequency signal to a second intermediate-frequency signal of a second intermediate frequency, which is lower than the first intermediate-frequency by half an FFT sampling clock frequency. A clock generator circuit (11) generates a signal of twice the FFT sampling clock frequency, that is, four times the frequency of the second intermediate frequency. The second intermediate frequency is sampled by an analog-to-digital converter (10) based on the signal supplied by the clock generator circuit (11), demodulated by a demodulator circuit (12), and supplied to an FFT circuit (13).