JPS56146337A - Monitor device for circuit quality - Google Patents

Abstract

PURPOSE:To ensure a high-accuracy monitor for the quality of circuit through a simple circuit constitution and even with just one circuit to be monitored, by securing an application of the sine wave received a distortion by the circuit noise as a noise level signal. CONSTITUTION:The sine wave signal (a) supplied from the sine wave oscillator 2 receives a distortion by the noise of communication circuit and is supplied to the shaping circuit 7. The circuit 7 generates the waveform shaping signal (h) and supplies it to the exclusive OR circuit 8. On the other hand, the rectangular wave oscillator 11 generates the reference waveform signal (i) having the same frequency as the oscillator 2. The reference sampling signal K synchronising with the signal (i) is converted into the sampling signal (l) according to an optional code transmitting speed through a multiplying circuit 12. A comparison is carried out at the exclusive OR circuit 8 between the signals (h) and (i), and a collation is given with the comparison result signal (j) by the signal (l) and at the AND circuit 9 to detect the element error (m). The error (m) is counted by the preset counting circuit 10, and the reference reduction signal (o) is delivered when the counting of the circuit 10 exceeds a certain reference value.