| 摘要 |
PURPOSE:To receive signals of a spread spectrum modulation system selecting the antenna of the best condition by switching antennas successively, and leaving a signal corresponding to a signal the highest in level from the results of comparison in one of storage parts, and using it as a digital detected signal. CONSTITUTION:A spread spectrum modulated RF signal inputted from the antenna 2 is selected by a changeover switch 3 under the control of a control part 13. Then, it is inputted to an RF/IF converting part 4, and is converted into the IF signal of an intermediate frequency band, and this IF signal is made to pass through an SAW matched filter 5. Hereinafter, absolute value data corresponding to a second antenna 2 obtained in a similar way is stored in the storage part 11, and simultaneously, it is compared 12 with the absolute value data corresponding to a first antenna 1 stored in the storage part 11. Then, the absolute value data of a higher level is left, for instance, in the storage part 11, and the digital detected signal corresponding to that absolute value data is left in the storage part 15, and is outputted. |
