| 摘要 |
PURPOSE:To obtain a detection circut where a low-pass filter, etc., are needless and receiving signals can be detected, by sampling receiving signals by timing pulses and sampling pulses which are generated by using a reference carrier and are controlled on the time base. CONSTITUTION:A phase modulation wave is not only given to sampling circuit 14 as a receiving signal but also supplied to timing generation circuit 15 and reference carrier circuit 16. Timing generation circuit 15 generates a timing pulse synchronized with the receiving signal at every one time slot and sends it to sampling pulse generation circuit 17. Meanwhile, reference wave generation circuit 16 supplies the reference carrier to sampling position control circuit 18 correspondingly to the phase modulation wave. Here, timing pulses and reference sampling pulses are used to sample pulses 20 which have the position controlled on the time base. Receiving pulses 20, sampling circuit 14 samples receiving signals and reads the sample result as it is. As a result, the precision of the sample result is improved, and a low-pass filter, etc., can be made needless. |
