Sound pickup in the presence of diffraction effects

Michael R. Stinson, James G. Ryan, Gilles Daigle


The variability of sound pressure level (SPL) due to diffraction is examined. Calculations show the considerable variation in SPL near the vertex of a right-angled wedge. For a device such as a computer monitor, different microphone locations can lead to differences of several dB, particularly at higher frequencies. When a directional receiver with two ports is used, account must be made of possible differences in the received signal strength or the assumed directionality could be lost. Similarly, for an array of receivers, the effects of diffraction at each receiver location must be determined to ensure effective beamforming and the desired performance.


Acoustic wave diffraction; Computational methods; Computer monitors; Microphones; Signal receivers; Sound pressure level (SPL)

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