| 摘要 |
PROBLEM TO BE SOLVED: To select a high frequency of an input signal without using a high speed device. SOLUTION: When pulses P1, P2,...P8 are given sequentially to 4-bit shift registers 10, 20 as input signals IN, the 4-bit shift register provides an output of phase signals A1, A2,...A4 to photocouplers PH1, PH2,...PH4. On the other hand, the 4-it shift register 10 outputs phase signals B1, B2,...B4 to photocouplers PH5, PH6,...PH8. Signals outputted from the phtocouplers PH1, PH2,...PH8 are given to a recovery circuit, which recovers the pulses P1, P2,...P8,...Pn and they are synthesized and an output signal OUT is recovered. |
