| 摘要 |
<p>PURPOSE:To easily detect simultaneous arrival when plural high-frequency signals whose frequency intervals are less than channel division frequency width arrive at the same time by providing a detecting means for simultaneous arriving signals based upon a beat signal of plural waves. CONSTITUTION:When the signals which are close to frequency array intervals of ch1-chn filters 15-1-15-n arrive at a channel division receiving device 9, the simultaneous arriving signal detecting means 26 receives them. The multifrequency beat signal generated by a detector 23 when the plural signals arrive at the same time is extracted by a BPF 24 and applied to a beat signal detecting circuit 25. The beat signal detecting circuit 25 detects the presence of the beat signal and measures the beat frequency. Thus, the presence and intervals of simultaneous arriving signals of close frequencies which can not be detected by a channel division receiver 9 using a filter bank 11 can be detected.</p> |
