| 摘要 |
PURPOSE:To omit the installation of the rectifier circuit to each group by securing the AND in the state of the pulse row and then applying the pulse row to the counter circuit after making sure that each row contains the pulse row. CONSTITUTION:The multi-frequency signal applied to input 1 is applied to isolation filters 3 and 4 via amplifier circuit 2 to be then isolated into the high and low group frequencies. These isolated frequencies are applied to limiter circuits 5 and 6 plus BPF7-14, and the maximum voltage appears to either output to be detected by detection circuits 15-22. The output of the detection circuit is applied to AND circuits 38-45 via OR circuits 30-37. On the other hand, the pulse rows are generated in proportional to the two signals applied at the output of OR circuits 23 and 24. This output is applied to AND circuit 27 to secure the AND to apply it to storage-type counter circuit 55. Circuit 55 counts the input pulse number up to the set value, and thus the output is applied to timer circuit 29. The output of circuit 29 is applied to one end of circuits 38-45 each to actuate the receiver. |
