| 摘要 |
PURPOSE:To reduce a sense error by delivering the primary pulse in response to an input from the 1st monostale multivibrator and adding the output of said pulse to the output of the long pulse width obtained by triggering the 2nd monostable multivibrator. CONSTITUTION:When the 1st pulse is supplied to an input terminal, a primary output pulse PQ1 is delivered from the 1st monostable multivibrator M1. Then the 2nd monostable multivibrator M2 is triggered to deliver an output pulse PQ2 having the pulse width equal to or larger than the output of the M1. Then an AND is obtained between an input pulse and the pulse PQ2. Therefore the output of an IC1 for decision of frequency is set at a low level. When the frequencies of the n-th and its subsequent input pulses exceed the clamping frequency, the output of the IC1 is set at an H level.
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