发明名称 OUT OF SYNCHRONISM DETECTING CIRCUIT
摘要 PURPOSE:To detect out of synchronism with high accuracy by converting digitally, amount of shift of synchronism between an input signal and an output signal into a pulse train, comparing the pulse train with a set value of a counter and outputting an out of synchronism display signal. CONSTITUTION:Suppose that an oscillating frequency of an oscillator 14 is sufficiently higher than the frequency of an input signal A. If the input signal A and the output signal B are shifted mutually, a pulse train having a width equal to the amount of shift of synchronism appears at an output C of an EXOR5. A counter 11 counts pulses of an output E of an AND gate 13 for the period of out of synchronism and if the count value exceeds the set value of the counter 11 set in advance, an H level is set to a set input S of an FF12, the FF12 is inverted and outputs an out of synchronism signal S0. Thus, the out of synchronism is detected with high accuracy.
申请公布号 JPS6098727(A) 申请公布日期 1985.06.01
申请号 JP19830207008 申请日期 1983.11.04
申请人 MITSUBISHI DENKI KK 发明人 KOUJI YOSHINOBU;KAWAI JIYOUJI
分类号 H03L7/095;H04L7/00 主分类号 H03L7/095
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