Download Entire Journal (36.1MB)
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| Volume 55 Number 12 | 2007 December |
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CONTENTS Download Entire Journal (36.1MB) |
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| PAPERS | |
| Degradation Decomposition of the Perceived Quality of Speech Signals on the Basis of a Perceptual Modeling Approach (PDF-1.2MB) (HI-RES PDF-10.7MB) | |
| John G. Beerends, Bartosz Busz, Paul Oudshoorn, Jeroen van Vugt, Kamal Ahmed, and Omar Niamut | 1059 |
| Extensive research has already provided metrics that can evaluate the quality of speech on nonideal channels, such as cell phones. In order for engineers to evaluate these quality measures, the present study decomposes degradation into three components and then explores the way in which each contributes to the overall perceived speech quality. These degradations include additive noise, time-invariant frequency response limitation, and time-response degradation, such as clicks and lost packets. The correlation between the proposed approach and subjective rating was found to be around 0.9. | |
| Comparison of Four Subwoofer Measurement Techniques (PDF-1.4MB) (HI-RES PDF-11.3MB) | |
| Manuel Melon, Christophe Langrenne, David Rousseau, and Philippe Herzog | 1077 |
| The difficulty in evaluating loudspeakers at very low frequencies is illustrated by comparing four different techniques for evaluating subwoofer directivity and frequency response. Because measurement rooms have dimensions that are small compared to these very large wavelengths, subwoofer loudspeakers cannot be observed without also considering the acoustic influence of the environment. The four techniques vary in terms of their required assumptions, a priori knowledge, cost of making measurements, and the accuracy of the results. | |
| Analysis of Multiactuator Panels in Space-Time Wavenumber Domain (PDF-1.6MB) (HI-RES PDF-21.3MB) | |
| Basilio Pueo, José J. Lépez, José Escolano, and Sergio Bleda | 1092 |
| A method for analyzing the radiation patterns and spatial aliasing of wave field synthesis demonstrates the strengths and weaknesses of multiactuator panels and arrays of conventional loudspeakers. The analysis was performed in the space-time wavenumber domain, which combined time and spatial frequencies. Because spatial truncation and array directivity create aliasing artifacts at various listener positions, there is a performance tradeoff in the size of the panels and the spacing of actuators. | |
| Adaptive Wave Field Synthesis for Sound Field Reproduction: Theory, Experiments, and Future Perspectives (PDF-2.1MB) (HI-RES PDF-22.9MB) | |
| Philippe-Aubert Gauthier and Alain Berry | 1107 |
| Because the algorithms used for wave field synthesis recreate a sound field with the assumption of being an anechoic space, a real space with its own acoustics often dramatically reduces the reproduction accuracy. By modifying the foundation mathematics, the algorithm can be made to adapt to the actual acoustics of a space. A penalty function allows for control over the degree to which adaptation is achievable. An experimental evaluation of two algorithms showed that independent radiation mode control enlarges the accuracy within the listening area. Adaptive wave field synthesis can be applied to many configurations. | |
| STANDARDS AND INFORMATION DOCUMENTS | |
| AES Standards Committee News (PDF-408KB) | 1125 |
| Subjective evaluation of loudspeakers; forensic audio; AES3 status data; audio applications of networks; acoustics and sound source modeling; microphone measurement; audio connectors | |
| FEATURES | |
| 13th Tokyo Regional Convention Report (PDF-2.2MB) | 1128 |
| Exhibitors (PDF-344KB) | 1133 |
| 32nd Conference Report, Hillerød, Denmark (PDF-7.5MB) | 1134 |
| 123rd Convention Report, New York (PDF-12.1MB) | 1142 |
| Exhibitors (PDF-1.4MB) | 1156 |
| High Resolution Audio (PDF-1.9MB) | 1161 |
| Education News (PDF-612KB) | 1168 |
| Call for Nominations for the Board of Governors (PDF-39KB) | 1180 |
| Call for Awards Nominations (PDF-50KB) | 1181 |
| 33rd Conference, Denver, Call for Papers (PDF-58KB) | 1188 |
| 34th Conference, Seoul, Call for Papers (PDF-34KB) | 1189 |
| Bylaws: Audio Engineering Society, Inc. (PDF-62KB) | 1190 |
| Index to Volume 55 (PDF-162KB) | 1194 |
| DEPARTMENTS | |
| Upcoming Meetings (PDF-78KB) | 1169 |
| News of the Sections (PDF-333KB) | 1170 |
| New Products and Developments (PDF-258KB) | 1177 |
| Available Literature (PDF-37KB) | 1179 |
| Membership Information (PDF-354KB) | 1182 |
| Advertiser Internet Directory (PDF-44KB) | 1185 |
| Sections Contacts Directory (PDF-143KB) | 1208 |
| AES Conventions and Conferences (PDF-147KB) | 1216 |
| EXTRAS | |
| Cover & Sustaining Members List (PDF-57KB) | |
| AES Officers, Committees, Offices & Journal Staff (PDF-67KB) | |