通过自适应逆控制方法，使得耳机的噪声消除得到进一步的改善。

Through the method of adaptive inverse control, the noise canceling of earphone can make a progress.

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混合逆数值算法是一种两步算法，包含直接矩阵反演求逆和二次规划两个步骤。

The Hybrid Inverse numerical method is a two-step numerical method, comprising of direct matrix inversion and quadratic programming.

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本文介绍了目前逆变式弧焊机的基本原理和技术现状，并指出了有待进一步解决的几个技术问题。

This paper introduces the basic principle and the technical status quo of the current inversion arc welding machines, and points out several technical problems needed to be resolved.

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