| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress the effect of disturbance of an adjacent channel when receiving a signal of a 1st segment (narrow band) at an end of a frequency band (channel), by using a tuner having only a band-pass filter with 3 segments (broadband). SOLUTION: A tuner 10 has only a band-pass filter with 3 segments (broadband), offsets a channel selection frequency of the tuner to suppress the effect of adjacent channel disturbance in the case of receiving a signal of 1 segment (narrow band) at an end of a frequency band (channel), and conducts channel selection control, so that the frequency offset is canceled by an orthogonal detection circuit. Furthermore, in the case of receiving a 3-segment (broadband) signal, the tuner 102 does not offset a channel selection frequency.</p> |
