Noise suppression is classified into two classes: Passive Noise Control and Active Noise Control.
噪声抑制方法可以分为两大类：被动噪声抑制和主动噪声抑制。
Modern control theory is used to study the harmonic suppression.
采用现代控制理论研究了谐波抑制的产生机理。
Modern control theory is used to study the harmonic suppression.
采用现代控制理论研究了谐波抑制的产生机理。
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