Download Entire Journal (9.7MB)
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| Volume 52 Number 10 | 2004 October |
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CONTENT Download Entire Journal (9.7MB) |
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| PAPERS | |
| 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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| COMMUNICATIONS | |
| 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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| STANDARDS AND INFORMATION DOCUMENTS | |
| AES Standards Committee News (PDF-138K) | 1065 |
| Microphone measurement | |
| FEATURES | |
| 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 |
| DEPARTMENTS | |
| 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 |
| EXTRAS | |
| Cover & Sustaining Members List (PDF-130K) | |
| VIP List & Editorial Staff (PDF-133K) | |