| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To obtain a receiving apparatus which extracts realtimely a frequency hopping signal whose hopping sequence is unknown, particularly in the vicinity of hopping without lack. <P>SOLUTION: To the frequency hopping signal whose hopping sequence as an object signal included in an arriving signal is unknown, for example, while detecting the hopping by applying techniques such as FFT etc., hopping channels are acquired. Alternatively, from the arriving signal delayed a predetermined time, a plurality of tuning circuits which extracts the object signal in tune with the acquired hopping channels is provided. When the hopping of the object signal is detected, the tuning circuit which is not under signal extraction among the provided plurality of tuning circuits is tuned to a newly detected hopping channel so as to await the delayed object signal after hopping, if the extraction of the object signal is started from this tuning circuit, this is synthesized so as to link to the extracted results until just before. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
