| 摘要 |
PURPOSE:To facilitate signal processing which reproduces an original digital signal from the reproduction signal by shorting the level inversion interval, setting the reproduction signal to be almost zero, and making the amplitude of the reproduction signal which corresponds to the level inversion of the part which has information appear positively or negatively in an alternate mode. CONSTITUTION:A digital signal (e) of information to be recorded is supplied to a digital differential circuit 1, it forms a signal (f) which is the ''1'' level during the T1 period starting from the rising part of the digital signal, and a signal (g) which is the ''0'' level during the T4 time starting from the falling period of the digital signal. Here, the T1 and the T4 are set as the shortest level inversion interval or below of the digital signal (e). In a repetition signal generation circuit 2, a repetition signal (h) in periods (T2+T3) which are the T2 period ''0'' and the T3 period ''1'' in the section from the falling part of the signal (f) to the next level inversion position of the digital signal (e) is generated. The T2 and the T3 of the repetition signal (h) are set to be smaller values that the value of the period T4 of the signal (f), and they begin from the condition of the ''0'' level. |
