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(3)时基校正电路(TBC) 在碟片播放过程中,由于碟片和激光头之间的相对速度,即碟片旋转时的线速度存在不均匀性,使播放信号的周期产生不均匀性,这里主要是主轴电机运转的不稳,碟片变形以及安装误差等因素,使播放的视频信号的时间购发生变化,造成屏幕上的图像抖动、扭曲以及闪烁等现象。时间轴变化,实际上就是电视信号的行周期不稳定,色副载波频率和相位不稳。这样会严重影响图像的播放质量。时基校正电路就是为消除视频
(3) Time Base Correction Circuit (TBC) In the process of disc playing, due to the relative speed between the disc and the laser head, that is, the linear speed of the disc rotates, there is unevenness in the cycle of the playing signal Sex, here is the main spindle motor instability, deformation and installation of the disc error and other factors, so that the video signal playback time changes occur, causing the image on the screen jitter, distortion and flicker and so on. Timeline changes, in fact, is the TV signal line cycle instability, color subcarrier frequency and phase instability. This will seriously affect the playback quality of the image. Time base correction circuit is to eliminate the video