Duct active noise control method using microphone array
During the operation of air conditioning ventilation ducts,the low-frequency noise generated internally is difficult to be eliminated through passive noise reduction methods such as wrapping silencing materials.When deploying active noise control,acoustic feedback may occur,affecting noise reduction performance and even causing control system divergence.In response to this acoustic feedback phenomenon,based on the analysis of the causes,this paper takes the microphone array as the feedforward,adds the linear constrained minimum variance beamforming algorithm of Duvall Frost structure with pre-tuning,and proposes an active noise control method using the Microphone array in the duct,which can pick up the noise signal from the upstream of the duct in a single direction to avoid the impact of acoustic feedback.The filter x minimum mean square error(FxLMS)algorithm is used as the adaptive control algorithm,and active noise control experiments are carried out in the duct environment for four typical low-frequency noises.The results show that compared to the situation without using a microphone array,the design in this paper can achieve good noise reduction performance and achieve good results in terms of stability.
active noise controlacoustic feedbackduct systemFxLMSmicrophone array
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