The research of a practical DDC system is presented. It's achieved to trace the target curve by feedback loop system with fixed feedback value.

介绍了某辗环机数字控制系统的研制，提出了采用定值反馈闭环控制方法跟踪目标值曲线。

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The results show that a longer feedback filter tap-length is not necessarily better when the feedforward filter tap-length converges to a certain range and the decision delay maintains a fixed value.

结果表明：变长自适应判决反馈均衡器在前馈滤波器长度收敛到一定的范围内、判决延迟保持一定的情况下，反馈长度并不是越长越好。

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