Analysis And Suppression Of Noise In Aviation Field

Feedback active noise suppression system is an important research area in the field of noise suppression.It's mainly used in noise-canceling headphones and it has been developing rapidly in recent decades.Based on the noise nuisance of outfield aviation,this dissertation pay special attention to the research and development of active noise canceling headphone of outfield aviation.The main research contents are as follows:1.Elaborating the research background,significance and the development at home and broad of active noise suppression.2.This dissertation introduces analyzes the basic characters,principles as well as the different types of active noise system.3.The application of the feedback active noise suppression system in the outfield aviation noise suppression is studied.First of all,collect the noise of the outfield aviation,then analyze the frequency domain of the ambient noise of the outfield aviation with the help of the MATLAB,thus its frequency distribution characteristics will be carried out.After that,the principle of the feedback active noise control system and the design requirements according to the analysis results are put forward.The chip and the peripheral circuit are selected and designed by the designing requirements.Finally,it's debugging and testing the system which provide the active noise reduction module for noise-canceling headphone in the forth chapter.4.Given out the development program of the noise reduction headphone which is exclusively used in the outfield aviation.Firstly,the overall design blue print is studied,and then the chip used for each module is selected and the peripheral circuit is designed according to the blue print.Combining the feedback active noise suppression system in the third chapter,we complete the entire design of the noise reduction headphones.5.The noise reduction headphones has tested.Through the tracking and acquisition of voice signal,we can get the voice signal waveform processed by MATLAB,and then we may verify the noise reduction effect of the noise reduction headphones according to the analysis of the signal waveform.6.The 6th chapter summarizes the content of this dissertation and make an outlook of its future research as well as the development still needed.