| President's Message (PDF-87KB) Wieslaw Woszczyk | 1139 |
| PAPERS | |
| Equalization in an Extended Area Using Multichannel Inversion and Wave Field Synthesis (PDF-1.4MB) (HI-RES PDF-8.0MB) | |
| E. Corteel | 1140 |
| Because of the nonideal directivity of loudspeakers in wave field synthesis, the conventional approach of individually equalizing each loudspeaker does not produce an accurate soundfield over an extended area of the listening space. A new method for equalization considers the full array of loudspeakers as a complete multiple-input multiple-output (MIMO) system. In the proposed multichannel inversion scheme, compensation is achieved for a limited ensemble of elementary virtual sources. Results show that the approach reduces rendering artifacts and spectral coloration over an extended listening area. | |
| Filter Design Method for Loudspeaker Equalization Based on IIR Parametric Filters (PDF-1.2MB) (HI-RES PDF-10.0MB) | |
| Germán Ramos and José J. López | 1162 |
| Equalizing a loudspeaker using a cascade sequence of second-order sections (low-pass, high-pass, or peak filter) is a viable alternative to the more conventional approach of a single large FIR filter. In order to optimize the parameters of each filter section, a two-step algorithm begins by first searching for a good initial solution and then applying a heuristic method using subjective criteria. The solution is scalable, subjectively validated, and produces a computational cost reduction in comparison to the conventional approach for the same degree of performance. | |
| Perceptually Biased Linear Prediction (PDF-604KB) (HI-RES PDF-7.4MB) | |
| Arijit Biswas and Albertus C. den Brinker | 1179 |
| In contrast to the standard linear prediction-based perceptual audio coding that uses a separate psychoacoustic model, the authors propose Laguerre-based linear prediction employing a perceptually biased solution. This greatly reduces the computational complexity because a separate psychoacoustic model is no longer required. Subjective listening tests show that the resulting audio quality is similar to that of the traditional approach. | |
| ENGINEERING REPORTS | |
| Application and Verification of the Objective Quality Assessment Method According to ITU Recommendation Series ITU-T P.862 (PDF-976KB) (HI-RES PDF-10.2MB) | |
| Antti Kurittu, Juha Salmela, Olli Kirla, Ari Lakaniemi, Ville-Veikko Mattila, and Nick Zacharov | 1189 |
| In recent years a number of speech quality prediction algorithms have been developed for evaluating telecommunications systems. The family of ITU-T recommendation P.862 is frequently used to create a mean opinion score of quality. Although these algorithms have been evaluated under common testing conditions for narrow- and wide-band speech signals, care must be used when these standards are applied to channels more specialized degradations, such as spectral aberrations, time scaling, and environmental noise. This study has discovered certain cases of suboptimal accuracy. As with the use of all quality-metric tools, the user must heed their limitations and scope of applicability in order to avoid erroneous conclusions. | |
| STANDARDS AND INFORMATION DOCUMENTS | |
| AES Standards Committee News (PDF-280KB) | 1215 |
| Personal computer audio quality measurements; storage environment for multiple media; polarity of audio signals; connectors for loudspeaker patch panels; analog recording; transfer technologies; storage and handling of media; digital library and archive systems; microphone measurement and characterization | |
| FEATURES | |
| 121st Convention Report, San Francisco (PDF-14.8MB) | 1218 |
| Exhibitors (PDF-1.9MB) | 1235 |
| Program (PDF-1.1MB) | 1241 |
| 30th Conference Preview, Saariselkä, Finland (PDF-2.9MB) | 1294 |
| Calendar (PDF-1.6MB) | 1296 |
| Program (PDF-158KB) | 1297 |
| Registration Form (PDF-115KB) | 1304 |
| Forging Ahead with Spatial Audio Coding (PDF-553KB) (HI-RES PDF-2.0MB) | 1305 |
| Education News (PDF-189KB) | 1314 |
| Call for Nominations for the Board of Governors (PDF-79KB) | 1318 |
| Call for Awards Nominations (PDF-294KB) | 1319 |
| 13th Regional Convention, Tokyo, Call for Papers (PDF-86KB) | 1324 |
| Bylaws: Audio Engineering Society, Inc. (PDF-102KB) | 1325 |
| Index to Volume 54 (PDF-304KB) | 1329 |
| DEPARTMENTS | |
| News of the Sections (PDF-279KB) | 1309 |
| Upcoming Meetings (PDF-278KB) | 1313 |
| Sound Track (PDF-189KB) | 1315 |
| New Products and Developments (PDF-98KB) | 1317 |
| Membership Information (PDF-234KB) | 1320 |
| Advertiser Internet Directory (PDF-233KB) | 1322 |
| Sections Contacts Directory (PDF-149KB) | 1344 |
| AES Conventions and Conferences (PDF-144KB) | 1352 |
| EXTRAS | |
| Cover & Sustaining Members List (PDF-59KB) | |
| AES Officers, Committees, Offices & Journal Staff (PDF-90KB) | |
