| 摘要 |
<p>High-quality reception of a radio signal is controlled by increasing the cut-off frequency and preventing suppression of the low-frequency component. A radio signal amplifying means (11) amplifies the received radio signal to generate an amplified signal. A frequency converting means (20) converts the radio signal from the radio frequency to an intermediate frequency by mixing a local oscillation signal and the amplified signal to generate an intermediate frequency signal. A frequency shift control means (31) shifts the frequency of the intermediate frequency signal to the higher side of the frequency band. A frequency inversion control means (32) inverts the low-frequency side of the intermediate frequency signal to the higher side of the frequency band and the high-frequency side to the lower side of the frequency band. An AC coupling means (40) is provided on the output side of a frequency control means (30). A radio signal demodulation means (50) demodulates the output signal from the AC coupling means (40).</p> |
