The article reports a sprout of 3‐degree‐of‐freedom (DOF) control. The limitation of feedback control, including 2‐DOF control, has been raised for a long time; however, a suitable control theory for overcoming those limitations has still not been formulated. An underlying reason is that the disturbance‐suppression performance and noise sensitivity cannot be decoupled. Several researches have tried to tackle this problem using a hardware approach, as a noise level depends on a hardware configuration. It should be noted that the hardware design expands spatiotemporal resolution of a system. This approach helps in reducing noise, namely, it works as the 3rd‐DOF for a control system. Therefore, an improvement in the hardware design could be a new angle for solving a mixed‐sensitivity problem. This article quantitatively presents the relation between noise‐reduction performance and the spatiotemporal resolution, and provides a foothold for the 3‐DOF control.

中文翻译：

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使用细粒度并行处理实现三自由度控制

该文章报告了3自由度（DOF）控制的萌芽。反馈控制（包括2自由度控制）的限制已经提出了很长时间。然而，尚未提出克服这些限制的合适的控制理论。根本原因是干扰抑制性能和噪声灵敏度无法分离。由于噪声水平取决于硬件配置，因此一些研究尝试使用硬件方法来解决此问题。应该注意的是，硬件设计扩展了系统的时空分辨率。这种方法有助于降低噪声，即，它可作为控制系统的第三自由度。因此，硬件设计的改进可能是解决混合灵敏度问题的新视角。