| 摘要 |
PURPOSE:To shorten the synchronization catching time of spectrum diffusing communication by equipping a shift register and an analog switch, obtaining the switching of a delay line with programmable tap from the respective steps of the shift registor and executing a shift in the opposite direction of the propagation direction of a surface acoustic wave. CONSTITUTION:A shift register 15 and an analog switch 14 are equipped and the switching of the respective taps of a delay line with programmable tap is obtained from the respective steps of the shift register 15. Then, correlation is obtained by shifting the contents of this shift register 15 in the opposite direction of the propagation direction P of the surface acoustic wave. Thus, the relative proceeding speed of the contents of the shift register 15 and the surface acoustic wave on the delay line is increased only by the shift speed of the shift register 15 and the synchronization catching time is shorted by the increased part. |
