AES Journal

Journal of the AES

2004 October - Volume 52 Number 10


Subjective Investigations of Inverse Filtering (PDF-469K)  
Scott G. Norcross, Gilbert A. Soulodre, and Michel C. Lavoie    1003
Much of the research on inverse filtering to correct room or loudspeaker irregularities assumes (without confirmation) that such techniques will improve the subjective listening experience. When this assumption is carefully tested, surprisingly, many techniques actually degrade overall audio quality rather than improve it. Two kinds of inverse filtering were tested: time-domain least squares and frequency deconvolution. Some additional techniques avoided perceptual artifacts but with an inconsistent amount of improvement.  

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Analysis of a Folded Acoustic Horn (PDF-792K)  
Andrew Bright, Keith Holland, and Frank J. Fahy    1029
Advanced analysis techniques, such as the boundary-element method (BEM), show that a folded horn can be represented by a one-parameter model at low frequencies. Such a model is able to reproduce the throat and transfer impedances as well as the pressure response with high accuracy below 300 Hz. At higher frequencies a more complex model is required. Although the BEM method can contribute to understanding low-frequency folded horns, it remains a complex analysis technique requiring specialized skills.  

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The Distributed Edge Dipole (DED) Model for Cabinet Diffraction Effects (PDF-1.0MB)  
M. Urban, C. Heil, C. Pignon, C. Combet, and P. Bauman    1043
A simple model, called distributed edge dipole, is proposed to explain the effects of cabinet edge diffraction on the radiated sound from a direct-radiating loudspeaker when mounted in an enclosure. In comparison to two other techniques, the proposed model more accurately predicts measurements of a thin circular baffle over 50 to 1000 Hz and over a wide angular range from 0 to180 degrees. More specifically, the improvements were obtained in the boundary region between the forward and backward directions.  

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Subjective Loudspeaker Testing for Accuracy (PDF-123K)  
David Lloyd ben Yaacov Yehuda Klepper    1060
Discussions about subjective loudspeaker preferences often ignore the need for a rating scale to evaluate accuracy. Preferences and accuracy are different perceptual qualities. Accuracy relates to the degree to which a reproduced sound field is subjectively equivalent to a corresponding live presentation of the same source. There is no proof that preferences among different individuals will match accuracy.  

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AES Standards Committee News (PDF-138K)    1065
Microphone measurement  
A Symposium on Multichannel Audio for Radio Broadcasters (PDF-759K)    1066
Review of Society's Sustaining Members (PDF-4.1MB)    1072
118th Convention, Barcelona, Call for Papers (PDF-71K)    1111
26th Conference, Denver, Call for Papers (PDF-81K)    1112
Reviews of Acoustical Patents (PDF-207K)    1062
News of the Sections (PDF-257K)    1094
Upcoming Meetings (PDF-82K)    1097
Advertiser Internet Directory (PDF-82K)    1097
Sound Track (PDF-98K)    1098
New Products and Developments (PDF-97K)    1100
Available Literature (PDF-98K)    1102
Membership Information (PDF-117K)    1103
In Memoriam (PDF-85K)    1110
Sections Contacts Directory (PDF-119K)    1113
AES Conventions and Conferences (PDF-190K)    1120
Cover & Sustaining Members List (PDF-130K)    
VIP List & Editorial Staff (PDF-133K)    
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