| 摘要 |
PURPOSE:To obtain a demodulation signal with a high S/N by taking correlation of a double side band of a signal subject to digital phase modulation, and eliminating noise not being a common component. CONSTITUTION:An AND circuit 9 takes correlation of double side bands and an EXOR circuit 10 an a latch circuit 12 detects a common part. Thus, the noise component included independently in the double side bands is eliminated to obtain a demodulation signal whose S/N is improved. Furthermore, a circuit 11 correcting the timing for the AND circuit 9 and the EXOR circuit 10 is placed to the pre-state of the latch circuit 12. Thus, the deterioration in the S/N sometimes caused at the reproduction of the demodulation signal clock due to a half clock delay circuit or the like is suppressed. |
