| 摘要 |
PURPOSE:To improve the reliability of magnetic bubble reading data by outputting a detecting signal when magnetic bubbles are detected at the generating timing of at least two pulse-like waveforms out of four generated from plural magneto-resistance effect elements. CONSTITUTION:A bridge circuit is formed by plural, e.g. two pairs, magneto- resistance effect elements R1, R2. Four pulse-like waveforms are generated through operational amplifiers 1, 11 before and after magnetic bubbles pass the elements R1, R2 and four pulses more than a thershold are outputted as an up/ down signal U/D through comparators 12, 13. When the signal U/D is impressed, an up/down counter 15 counts up e.g. three strobe pulses STB synchronous with the pulse U/D continuously during the low level period of a clear signal DCR. When the detection of magnetic bubbles are acknowledged at the generating timing of at least two pulse-like waveforms out of four, an AND gate 17 is turned to the high level through the counter 15 and a magnetic bubble detecting signal is generated. Consequently, malfunction due to noise is removed and the reliability of the magnetic bubble reading data is improved. |
