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(5)主轴伺服电路在播放影碟时,碟片以每分钟1800转的速度进行旋转,要保证信息转迹恒定的线速度,主轴电机要做变速运动,这就要求主轴电机本身的转速十分精确,但即使这样要完整地读取那些细微的坑点还是不行的,因此,需要有高精度的主轴旋转伺服以保证光学拾取系统在单位时间内拾取到的信息量是一个常数。主轴伺服是利用视频中分离出来的行同步信号和石英晶体振
(5) Spindle servo circuit When playing video discs, the disc rotates at a speed of 1800 rpm. To ensure a constant linear velocity of information transfer, the spindle motor needs to make variable speed motion, which requires the spindle motor itself to rotate at a very fast speed However, even if it is impossible to read those fine pits completely, a high-precision spindle rotation servo is needed to ensure that the amount of information picked up by the optical pickup system per unit time is a constant. Spindle servo is the use of the video line sync signal and quartz crystal oscillator