| 摘要 |
PURPOSE:To ensure the accurate demodulation by adding the output of a correlator and an averaging circuit and giving the output of the correlator which is set at a level zero in a non-correlation mode to a sample timing generating circuit after applying the digital integration to said output of the correlator. CONSTITUTION:A spread spectrum signal SA is applied to a correlator 2 and an averaging circuit 3, and signals SB and SC are delivered from the correlator 2 and the circuit 3 respectively. An adder 4 adds the signals SB and SC to obtain a signal SD which is set at zero in a non-correlation mode. This signal SD is converted by an A/D converter 5 and integrated by an integrator 10 to be applied to a sample timing generating circuit 14. Thus it is possible to demodulate accurately the data signal produced in the sample timing. |
