| 摘要 |
PURPOSE:To simplify circuit configuration by demodulating data by performing delay processing on the reception side with a base band concerning the asynchronous spread spectrum communication system utilizing a SAW matched pulse. CONSTITUTION:On the transmission side, a PN code sequence is initialized at a front edge part where source binary data rise, and a PN code is selectively transmitted corresponding to the polarity of source binary data. On the reception side, the matched pulse is detected by a SAW correlator 24 for each cycle of the PN code, and this is square-detected by a double balanced modulator 25. The pulse-shaped matched pulse prepares a set pulse and a reset pulse with different pulse width and demodulates the source binary data at a set priority flip-flop circuit 30. |
