| TUTORIALS | |
| Tutorial: Loudspeaker Nonlinearities-Causes, Parameters, Symptoms (PDF-1.6MB) (HI-RES PDF-40.9MB) | |
| Wolfgang Klippel | 907 |
| This comprehensive review and tutorial discussion about nonlinear distortion in loudspeakers offers a clear perspective: under the right conditions, measurements may manifest particular nonlinear electromechanical mechanisms. Because there are a large number of such mechanisms, signals must be carefully selected to excite particular nonlinearities. A catalog of observable manifestations provides a working recipe for diagnosing defects, which then makes possible design improvement. Three examples illustrate this approach. | |
| PAPERS | |
| Efficient Resonant Loudspeakers with Large Form-Factor Design Freedom (PDF-784KB) (HI-RES PDF-21.0MB) | |
| Ronald M. Aarts, Joris A. M. Nieuwendijk, and Okke Ouweltjes | 940 |
| It is not possible to combine high efficiency and wide frequency bandwidth in small cabinet loudspeakers. However, by changing assumptions and allowing nonlinear electronic processing, a small loudspeaker can operate in the high-efficiency spectral region. Compressing the 2.5-octave region from 20 to 120 Hz into a narrow frequency at the natural resonances of the loudspeaker provides a means for optimizing both size and efficiency. However, acoustic quality at low frequencies is compromised. An experimental prototype illustrates the approach. | |
| Vibrotactile Enhancement of Auditory-Induced Self-Motion and Spatial Presence (PDF-420KB) (HI-RES PDF-5.4MB) | |
| Aleksander Väljamäe, Pontus Larsson, Daniel Västfjäll, and Mendel Kleiner | 954 |
| Using cross-modal stimulation of multiple senses can enhance the illusion of motion in entertainment and virtual environments. Mechanically induced vibrations significantly improve the sense of self-motion and presence. Since vestibular excitation is not possible when not actually moving, auditory and tactile sensations can enhance an illusion of movement and presence in virtual environments. Examples of using three audio-tactile scenes illustrate the degree to which an illusion of movement is created. | |
| ENGINEERING REPORTS | |
| Virtual Air Guitar (PDF-529KB) (HI-RES PDF-11.5MB) | |
| Matti Karjalainen, Teemu Mäki-Patola, Aki Kanerva, and Antti Huovilainen | 964 |
| Playing a virtual guitar by tracking hand motions illustrates an approach to a natural user interface for synthesized music. Three different methods for sensing hand motion and position have been tried: data gloves in a virtual room, optical tracking of hand movement, and special control sticks that sense acceleration. Of these, optical tracking with a web camera offers the least expensive approach, since such devices are often part of a computer system. Demonstration systems at Heureka Science Center have allowed thousands of visitors to enjoy the feeling of being a rock star. Eventually, this approach may lead to the evolution of professional musical instruments. | |
| LETTERS TO THE EDITOR | |
| Comments on "Model Optimization of Distributed-Mode Loudspeaker Using Attached Masses" | |
| Frank Fahy | 981 |
| Authors' Reply | |
| Suzhen Zhang and Yong Shen (PDF-234KB) (HI-RES PDF-4.1MB) | 981 |
| Comments on "Low-Frequency Optimization Using Multiple Subwoofers" | |
| Earl R. Geddes (PDF-237KB)(HI-RES PDF-4.1MB) | 983 |
| Authors' Reply | |
| Todd Welti and Alan Devantier (PDF-158KB) | 984 |
| CORRECTIONS | |
| Corrections to "Noise Power Modulation in Dithered and Undithered High-Order Sigma-Delta Modulators" | |
| Ivar Løkken, Anders Vinje, and Trond Sæther (PDF-68KB) | 985 |
| STANDARDS AND INFORMATION DOCUMENTS | |
| AES Standards Committee News (PDF-97KB) | 986 |
| Acoustics and sound-source modeling; audio connectors; grounding and EMC | |
| FEATURES | |
| Binaural Technology for Mobile Applications (PDF-710KB) (HI-RES PDF-12.2MB) | 990 |
| New Officers 2006/2007 (PDF-519KB) | 996 |
| Review of Society's Sustaining Members (PDF-451KB) | 1001 |
| 122nd Convention, Vienna, Call for Papers (PDF-97KB) | 1037 |
| 31st Conference, London, Call for Papers (PDF-111KB) | 1038 |
| 32nd Conference, Hillerød, Call for Papers (PDF-106KB) | 1039 |
| DEPARTMENTS | |
| Reviews of Acoustical Patents (PDF-584KB) | 987 |
| News of the Sections (PDF-154KB) | 1023 |
| Upcoming Meetings (PDF-146KB) | 1026 |
| Sound Track (PDF-175KB) | 1027 |
| New Products and Developments (PDF-106KB) | 1030 |
| Available Literature (PDF-105KB) | 1031 |
| Membership Information (PDF-154KB) | 1032 |
| Advertiser Internet Directory (PDF-154KB) | 1035 |
| In Memoriam (PDF-2.0MB) | 1036 |
| Sections Contacts Directory (PDF-153KB) | 1040 |
| AES Conventions and Conferences (PDF-239KB) | 1048 |
| EXTRAS | |
| Cover & Sustaining Members List (PDF-91KB) | |
| AES Officers, Committees, Offices & Journal Staff (PDF-170KB) | |
