| 摘要 |
PURPOSE:To effectively prevent interference between codes, by adding a square wave of a width proportional to the inversional width of a recording electric current to the rising point of the recording current and, at the same time, another square wave of a width proportional to the falling width of the recording current to the falling point of the recording current. CONSTITUTION:A count value latched by a latch circuit 9 addresses a ROM10 at the timing shown by the waveform G and the ROM10 outputs parallel data of a scale proportional to the address, namely, the count value. The parallel data are converted into serial data by a parallel-serial converting circuit 11 and become a square wave having a width proportional to count values of counters 1 and 2, namely proportional to the inversional interval of a recording electric current as shown by a waveform H. The square wave is supplied to an adder/subtractor circuit 13 after an appropriate quantity is attenuated by an attenuator 12. By making the width of a square wave superposed upon the recording current proportional to the inversional width, the rising end and falling end and a position behind the ends, where magnetization inversion is produced in the opposite direction, can be standardized with respect to the inversional width. |
