Active cancellation of oblique noise entering a window

Environmental noise propagating through an open window may be cancelled by a sparse array of transducers placed in the window frame. This approach towards global noise cancellation mitigates noise pollution at its source while retaining the light and ventilation received from an open window. Heretofore the array’s performance has been studied with a normally incident noise source; however, oblique noise sources must be considered to fully illustrate the array’s viability as a commercial product. Analytical and finite element models were used to perdict the array’s global noise cancellation capabilities with regards to oblique noise sources, and these results were verified via experimental implementation. Flaws inherent to the current array, including cross bar vibrations and nonoptimal transducer placement, will be discussed along with how they will be circumvented in a future array iteration.