Download Entire Journal (5.7MB)
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| Volume 52 Number 4 | 2004 April |
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CONTENT Download Entire Journal (5.7MB) |
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| President's Message (PDF-35K) | |
| Ron Streicher | 331 |
| Link to Distinguished Speakers Program | |
| PAPERS | |
| Graphing, Interpretation, and Comparison of Results of Loudspeaker Nonlinear Distortion Measurements (PDF-666K) | |
| Alexander Voishvillo, Alexander Terekhov, Eugene Czerwinski, and Sergei Alexandrov | 332 |
| For loudspeaker nonlinearity, measurement techniques range from single-tone harmonic distortion, which is easy to interpret but not indicative of performance with music, to reactions to multitone stimuli, which are hard to interpret but highly informative. Because multitone techniques have the potential to predict the perception of nonlinearities, the authors focus on various presentation formats and analysis techniques to make the relevant information in the thousands of intermodulation products accessible and meaningful. | |
| Comment on this paper | |
| ENGINEERING REPORTS | |
| Impedance Compensation Networks for the Lossy Voice-Coil Inductance of Loudspeaker Drivers (PDF-211K) | |
| W. Marshall Leach, Jr. | 358 |
| The high-frequency rise in the voice-coil impedance of a loudspeaker driver produced by lossy voice-coil inductance can be approximately cancelled by a Zobel network connected in parallel. Such networks improve performance by presenting purely resistive impedance to the crossover network. Although higher order networks can be used, a pair of resistors and capacitors is sufficient for typical drivers. | |
| Comment on this report | |
| Scalable, Content-Based Audio Identification by Multiple Independent Psychoacoustic Matching (PDF-243K) | |
| Geoff R. Schmidt and Matthew K. Belmonte | 366 |
| A software audio search system, as an analog to text searching, allows a target music sample to be identified by matching it to a database containing an inventory of reference samples. Rather than rely on autonomous metadata, the algorithm uses a sequence of vectors based on perceptual attributes. By iteratively testing a progression of such vectors, the algorithm has the ability to trade accuracy versus compute time. With increasing storage capacity to hold virtually unlimited quantities of audio data, an efficient search algorithm is a necessity. | |
| Comment on this report | |
| On the Detection of Melodic Pitch in a Percussive Background (PDF-491K) | |
| Preeti Rao and Saurabh Shandilya | 378 |
| Although many pitch detection algorithms have been proposed over the years, the problem is particularly difficult when melodic instruments are accompanied by percussive background. The authors propose a temporal autocorrelation pitch detector motivated by an auditory model that attempts to suppress errors produced by inharmonic interfering partials of such instruments as a kick drum. Separate processing of frequency channels proved crucial in reducing the distortion products, due to the nonlinear hair-cell model, between the signal harmonics and the interfering partials. | |
| Comment on this report | |
| STANDARDS AND INFORMATION DOCUMENTS | |
| AES Standards Committee News (PDF-94K) | 392 |
| New AESSC chairman; audio file interchange; audio over IEEE 1394 | |
| FEATURES | |
| 25th Conference Preview, London (PDF-553K) | 402 |
| Calendar (PDF-207K) | 404 |
| Program (PDF-58K) | 405 |
| Registration Form (PDF-29K) | 411 |
| Historical Perspectives and Technology Overview of Loudspeakers for Sound Reinforcement (PDF-1.0MB) | |
| J. Eargle and M. Gander | 412 |
| DSP in Loudspeakers (PDF-553K) | 434 |
| Surround Live Summary (PDF-321K) | |
| Frederick Ampel | 440 |
| 26th Conference, Baarn, Call for Papers (PDF-38K) | 457 |
| DEPARTMENTS | |
| Review of Acoustical Patents (PDF-257K) | 395 |
| News of the Sections (PDF-108K) | 443 |
| Upcoming Meetings (PDF-38K) | 447 |
| Sound Track (PDF-49K) | 448 |
| New Products and Developments (PDF-63K) | 449 |
| Available Literature (PDF-33K) | 450 |
| Membership Information (PDF-321K) | 451 |
| Advertiser Internet Directory (PDF-282K) | 453 |
| In Memoriam (PDF-44K) | 456 |
| Sections Contacts Directory (PDF-70K) | 458 |
| AES Conventions and Conferences (PDF-121K) | 464 |
| EXTRAS | |
| Cover & Sustaining Members List (PDF-84K) | |
| VIP List & Editorial Staff (PDF-68K) | |