| 摘要 |
PURPOSE:To compensate the influence of a recording demagnetization and to prevent the generation of a beat disturbance by magnetically recording a three-level FM signal at a rear edge level larger than a pulse front edge level. CONSTITUTION:A three-level FM signal D is composed, simultaneously, the level of B in charge of the preparation of the rear edge of the pulse is made large, it is made into G, and G and C are superimposed, a recording FM signal waveform H is obtained. Here, a waveform distortion in a shape to lower the level of the rear edge part of a residual magnetic waveform can be compensated by recording the pulse rear edge part at a signal level to be relatively large. Thus, without losing the characteristic of the three-level FM signal, the magnetic recording can be executed, and the resolution and picture quality of a video tape recorder, etc., can be improved. |
