| 摘要 |
PURPOSE:To improve a bit density by making pulse width narrower than the width of time slot and overlay on the other pulse which is made narrower than the width of the pulse, when a magnetic recording is performed with a ternary code. CONSTITUTION:Original signal B entered from an input terminal 1, is devided into two lines. One is delayed in a delay circuit 2 by time T' and take difference from the original signal B through a subtracter 3 to generate signal C. The signal C further divided into three lines. One of the three is passed through a delay circuit 4 and delayed by the time T'' and takes difference from the other signals by passing through another subtracter 5. Then, the amplitude of the signal is attenuated by passing through alpha attenuator 8 to generate a signal D. The signal D and the other signals which are attenuated to 1-alpha by another attenuator 7, are added by an adder 6 to obtain a signal which has wave form indicated by E at an output terminal 9. Each current wave form of signal pulse has returned to zero in the time slot and therefore, interference between codes can be eliminated to obtain a record with high density. |
