录像机中可变跟踪磁头驱动电路研究

A Study on the Driving Circuit of Variable speed Tracking Heads in Video Tape Recorders

录像机中的跟踪系统只有在以标准速度运行时才能进行准确跟踪。在快进／倒带或慢速重放时，跟踪的准确性将下降，噪声将增大。为了确保准确跟踪，提高重放信号的信噪比，笔者给出了适用的可变跟踪磁头驱动电路，并对其进行了改进。

The tracking system in video tape recorders (VTR) can only track accurately at normal speed. At fast forward/rewind or slow regeneration the tracking accuracy will be deteriorated and the noise will be increased. The suitable driving circuit of variable speed tracking heads is given and improvement of the circuit has been made in order to ensure accurate tracking and increase the SNR of regeneration signals.