| 摘要 |
<p>PURPOSE:To realize the reception system with only one SAW matched filter by clearing a counter only when a frame signal is set, counting data while an output signal of an RS latch is set, latching the data in a register while the count is stopped and outputting the data serially. CONSTITUTION:A signal of a prescribed level whose frequency is decreased to a center frequency is inputted to a matched filter 25 and when there is any input in matching with a pattern of the matched filter 25, a signal of an intermediate frequency equivalent to one chip period is pulsively outputted and a detection device 26 detects the signal in terms of envelope. A counter CNT 3 is cleared at the start of a data slot (start = 1) and the counter counts the signal only when an RS latch 34 is set. The value when the count is finished is a value of sent symbol. The value is fetched in a parallel serial converter 37, from which a serial data is outputted.</p> |
