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利用声波相干理论，使噪声在控制区域内与次级声波发生干涉相消，来达到抑制或消除噪声的目的。根据有源消声原理，在实验室建立了一维管道有源降噪物理模型，最大消声指数可达２１ｄＢ，对工业应用有一定参考价值。
The use of acoustic coherence theory, so that noise in the control region and the secondary sound waves interfere with the interference, to achieve the purpose of suppression or elimination of noise. According to the active muffler principle, a one-dimensional pipe active noise reduction physical model has been set up in the laboratory. The maximum muffling index can reach 21dB, which has some reference value for industrial application.