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dc.contributor.authorHill, Adam J.
dc.contributor.authorHawksford, Malcolm O. J.
dc.contributor.authorNewell, Philip
dc.date.accessioned2016-06-06T13:17:51Z
dc.date.available2016-06-06T13:17:51Zen
dc.date.issued2016-05-19
dc.identifier.citationNewell, P., Hill, A. J., and Hawksford, M. (2016) 'Enhanced Wide-Area Low-Frequency Sound Reproduction in Cinemas: Effective and Practical Alternatives to Current Calibration Strategies'. Journal of the Audio Engineering Society, vol. 64, issue 5, pp. 280-298.en
dc.identifier.doi10.17743/jaes.2016.0012
dc.identifier.urihttp://hdl.handle.net/10545/611819
dc.description.abstractThe current strategies for the low-frequency calibration of cinema sound systems are based on a flawed premise of low-frequency acoustics and psychoacoustics. This research shows that there is virtually no benefit in terms of spatiotemporal variance reduction: pre- and post-calibrated systems will exhibit equally position-dependent listening experience differences. For modern cinemas, the typical focus on room-modes when designing a low frequency calibration system is not necessary because the dimensions of the space coupled with low reverberation time results in Schroeder frequencies around 35 Hz. Above this value, effects of room-modes are not perceptible. Comb-filtering between sources and low-order reflections is the primary cause of high spatial variance. Furthermore, there is no evidence that spatial averaging techniques used for measurement and equalization are subjectively beneficial. A new approach needs to be invented.
dc.language.isoenen
dc.publisherAudio Engineering Societyen
dc.relation.urlhttp://www.aes.org/e-lib/browse.cfm?elib=18134en
dc.subjectAudioen
dc.subjectAudio engineeringen
dc.subjectLoudspeakersen
dc.subjectAcousticsen
dc.subjectCinema sounden
dc.subjectPsychoacousticsen
dc.subjectOptimisationen
dc.titleEnhanced wide-area low-frequency sound reproduction in cinemas: effective and practical alternatives to current calibration strategiesen
dc.typeArticleen
dc.contributor.departmentUniversity of Derbyen
dc.contributor.departmentUniversity of Essexen
dc.contributor.departmentAcoustic Consultanten
dc.identifier.journalJournal of the Audio Engineering Societyen
refterms.dateFOA2017-05-01T00:00:00Z
html.description.abstractThe current strategies for the low-frequency calibration of cinema sound systems are based on a flawed premise of low-frequency acoustics and psychoacoustics. This research shows that there is virtually no benefit in terms of spatiotemporal variance reduction: pre- and post-calibrated systems will exhibit equally position-dependent listening experience differences. For modern cinemas, the typical focus on room-modes when designing a low frequency calibration system is not necessary because the dimensions of the space coupled with low reverberation time results in Schroeder frequencies around 35 Hz. Above this value, effects of room-modes are not perceptible. Comb-filtering between sources and low-order reflections is the primary cause of high spatial variance. Furthermore, there is no evidence that spatial averaging techniques used for measurement and equalization are subjectively beneficial. A new approach needs to be invented.


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