| 摘要 |
PURPOSE:To reduce the mutual interference of a regenerative waveform, and to prevent the lowering of margin at the time of high density recording by delaying an original signal by plural different time actually, and obtaining one regenerative signal by executing the arithmetic operation of one obtained delayed signal and other signal. CONSTITUTION:The original signal f(t+tau) 101 is delayed by tau by a delaying means 102, and goes to the delaying signal f(t) 103, and is inputted to a subtracter 104. On the other hand, the branched original signal 101 is delayed by 2tau by the delaying means 106, and goes to the delaying signal f(t-tau) 107 and is synthesized with the undelayed original signal f(t+tau) 105, and is inputted to an attenuator 108. The signal 109 turned into (k/2)[f(t-tau)+f(t+tau)] by the attenuator 108 is inputted to the subtracter 104. The subtraction processed regenerative signal g(t) 110 is the regenerative signal, and the signal is demodulated by using the g(t) 110. Thus, the mutual interference of the regenerative waveform can be reduced, and the lowering of the margin at the time of the high density recording can be prevented. |
