| 摘要 |
<p>PURPOSE:To send data through the use of the spread spectrum communication system by converting a data string generated through the detection of a period of an M series signal into a serial signal and exclusive ORing the converted signal together with the M series code. CONSTITUTION:An M series generator 22 comprising plural stages of flip-flops and a gate circuit feeding back its output and driven by a clock signal of a clock generator 21 generates an M series code. plts output is given to an exclusive OR circuit (EOR) 23 and a period detection circuit 24, the latter circuit detects a period of the M series code and its output is given to a P/S converter 5 and a frequency divider 3. An output of the P/S converter 5 is given to a phase modulator 6 via the EOR circuit 23, in which the phase is modulated and the result is given to an antenna 8. Thus, strong noise immunity and a sufficient communication distance are obtained, and the degree number of the M series spread code is increased to improve the S/N.</p> |
