Sound field control for a low-frequency test facility

Christian Sejer Pedersen, Henrik Møller

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

5 Citations (Scopus)

Abstract

The two largest problems in controlling the reproduction of low-frequency sound for psychoacoustic experiments is the effect of the room due to standing waves and the relatively large sound pressure levels needed. Anechoic rooms are
limited downward in frequency and distortion may be a problem even at moderate levels, while pressure-field playback can give higher sound pressures but is limited upwards in frequency. A new solution that addresses both problems has been implemented in the laboratory of Acoustics, Aalborg University. The solution uses one wall with 20 loudspeakers to generate a plane wave that is actively absorbed when it reaches the 20 loudspeakers on the opposing wall. This gives a homogeneous sound field in the majority of the room with a flat frequency response in the frequency range 2-300 Hz. The lowest frequencies are limited to sound pressure levels in the order of 95 dB. If larger levels are needed, a hybrid mode can be used to utilize the pressure-field conditions at frequencies up to approx. 30 Hz while the higher frequencies are controlled by plane-wave generation. This approach allows for playback of levels at the lowest frequencies in the order of 125 dB while still maintaining a homogeneous sound field for the entire frequency range 2-300 Hz.
Original languageEnglish
Title of host publicationProceedings of AES 52nd International Conference : Sound Field Control
Number of pages10
PublisherAudio Engineering Society
Publication date2013
Article number8-1
Publication statusPublished - 2013
EventAES 52nd International Conference - Guildford, United Kingdom
Duration: 2 Sep 20134 Sep 2013
Conference number: 52nd

Conference

ConferenceAES 52nd International Conference
Number52nd
CountryUnited Kingdom
CityGuildford
Period02/09/201304/09/2013

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