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对光记录中位置误差信号检测所采用的三种主要方式：推挽法、三点法和采样法进行了比较；结合以上三种方式介绍了与之相对应的两种光盘伺服格式：连续复合伺服格式和采样伺服格式，并对两种伺服格式的性能做出评价。
There are three main ways to detect the position error signal in optical recording: the push-pull method, the three-point method and the sampling method. The two kinds of optical servo formats are described in combination with the above three methods: continuous composite Servo format and sample servo format, and evaluate the performance of the two servo formats.