| 摘要 |
PURPOSE:To detect accurately the peak position of a reproduction signal and to improve the reliability for reproduction of a magnetic memory, by producing a gate signal which detects the peak position of the reproduction signal by a differentiation system and excludes the peak position of a signal due to noises by an integration system. CONSTITUTION:The record data is written onto a magnetic disk by a magnetic disk through a writing circuit 12, and the reproduction signal read by the head 11 is supplied to an amplifier 13. The output of the amplifier 13 is branched into two parts. One of these two outputs is supplied to a differentiating circuit 14 and differentiated; while the other output is supplied to an integration circuit 17 and integrated. This integration waveform is converted into a peak pulse PP-B via a zero-slice circuit 18, and this 2nd peak pulse PP-B is supplied to a delay circuit 19 and a triggerable monostable circuit 20 respectively. The circuit 19 delays the 2nd peak pulse by 3 bits like the input 1st peak pulse PP-A to produce a signal D. This signal D is delivered to an AND circuit 21 and a flip-flop circuit 22 respectively. A pulse NP produced by noises is excluded and only a correct signal peak pulse is detected. |
