| 摘要 |
PURPOSE:To improve the recording density by subtracting a waveform obtained through the proper adjustment of the amplitude of a second order differentiation of a reproduced waveform from the original reproduced waveform so as to apply more pulse slimming than that executed conventionally thereby decreasing the pattern peak shift. CONSTITUTION:A reproduced isolate pulse read magnetically from a recording medium is expressed in terms of a time function ''(t). The said reproduced isolate pulse ''(t) is differentiated by second order, a waveform K1''(t) obtained by multiplying a weight K1 to the result and a waveform ''(t)-K1''(t) is obtained by subtracting the K1''(t) from the original reproduced isolate pulse pulse waveform ''(t). Thus, pulse slimming is realized without producing the decrease of the amplitude before and after the waveform equalization. |
