Compact loudspeaker arrays are widely used for the localized delivery of audio messages and beamforming applications. The optimal directivity performance of these devices is limited to a given frequency limit, whose upper bound is defined by the occurrence of spatial aliasing. The lower bound of this frequency range is caused by the limited capability of the array to generate a directional sound beam when the wavelength of the sound to be reproduced is large in comparison to the size of the array. In this work a theoretical and experimental study is presented of the directivity limitations of circular loudspeaker arrays at low frequencies. The frequency at which the array directivity pattern starts to diverge from the desired one is calculated analytically and put into relation with the dynamic range of the transducers and with the regularization scheme used when designing the beamforming digital filters.
https://www.aes.org/e-lib/browse.cfm?elib=17635
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.
Learn more about the AES E-Library
The Engineering Briefs at this Convention were selected on the basis of a submitted synopsis, ensuring that they are of interest to AES members, and are not overly commercial. These briefs have been reproduced from the authors' advance manuscripts, without editing, corrections, or consideration by the Review Board. The AES takes no responsibility for their contents. Paper copies are not available, but any member can freely access these briefs. Members are encouraged to provide comments that enhance their usefulness.
Start a discussion about this paper!
