Demetriou, Michael A.
Durgin, William W.
Over the past century, industry has struggled to make noise reduction and cancellation systems compact and affordable. In this project a suitable active controller for closed-cavity applications was developed. Utilizing acoustics and controls theory, namely the wave-equation as applied in a one-dimensional cavity as well as determining reasonable frequency ranges and variable or fixed time-step intervals based on processer speed, an apparatus consisting of a pipe fitted with speakers and microphones was fabricated. dSAPCE control desk software and Mathworks' Simulink library were used to iteratively build varying layouts. Matlab built the models and ran the controller to verify its noise cancellation capabilities. Based on the capabilities of the system, and the signal processing power of the dSPACE box, 1-2 inputs were sufficient for achieving a dB level reduction that both could be computed through Matlab and displayed through the control desk software.
Worcester Polytechnic Institute
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