A New Narrowband ANC System In The Presence Of Nonstationary Frequency Mismatch

Nowdays, the industrial society, acceleration of industrialization results innoise pollution difficult to control. How to cope with the noise pollution has becomehot research direction.Compared with traditional noise control, Active Noise Control (ANC) has greatadvantage of dealing with low-frequency noise, becoming one of the main researchdirections. During practical application, most of the application environment can beabstracted as one-dimensional pipe. So researchers would like to simulate theenvironment of eliminating pipe noise. Besides, Frequency Mismatch is inescapablein narrowband ANC system. There are unstable factors in the detection of referencesignal frequency. To cope with FM, we come up two modified compensationalgorithms: algorithm of momentum LMS FM compensation and compensationalgorithm with two variable step sizes. They work with VSS-FXLMS controller toimprove performance of the system and solve the problem of FM.In this essay, we concentrate on several aspects:Firstly, giving the development introduction of ANC and advantages anddisadvantages of all kinds of ANC systems. Then we give you the comparativeanalysis of self-adjusted filter algorithms used widely.Then, using Pipe ANC system of the lab, have good command of the system.that is necessary for putting forward algorithm of FM compensation.Thirdly, based on analysis of the traditional frequency compensation, wepresent two modified compensation algorithm. After doing plenty of simulation, getthe advantage and disadvantage of these algorithms’ h according to quantitativeresult.Lastly, use the Pipe ANC system, we verify two FM compensation algorithmsto get the final results.