VOLUME 48 NUMBER 7/8 2000 JULY/AUGUST

CONTENT

PAPERS

Real-Time Streaming of Multichannel Audio Data over Internet
Aoxiang Xu, Wieslaw Woszczyk, Zack Settel, Bruce Pennycook, Robert Rowe, Philip Galanter, Jeffrey Bary, Geoff Martin, Jason Corey, and Jeremy R. Cooperstock 627

An Internet multichannel audio streaming system was demonstrated between McGill University and an audience at New York University. This original system used TCP and UDP protocols with proprietary buffering and retransmission algorithms for seamless, uninterrupted performance. Currently neither protocol alone is sufficient for applications of this nature, but ongoing work to combine the advantages of each protocol holds promise for a wide variety of future applications.

Direct Concha Excitation for the Introduction of Individualized Hearing Cues
Chong-Jin Tan and Woon-Seng Gan 642

A prototype headphone has been designed to reduce the front-to-back and elevation confusions when used in 3-D sound systems. A proposed acoustical method introduces individual directional auditory cues to excite the concha without the need for individual head-related transfer function (HRTF) measurements to correct directional anomalies. It is claimed that this method reduces the directional confusion found in conventional 3-D headphone listening.

High-Precision Fourier Analysis of Sounds Using Signal Derivatives
Myriam Desainte-Catherine and Sylvain Marchand 654

An original, modified Fourier transform greatly enhances the precision of Fourier analysis in its frequency and amplitude resolution capabilities. This new Fourier analysis is performed in a shorter time frame when compared to more conventional transforms. This method requires the computation of two small, discrete Fourier transforms instead of a single, much larger one. It is of great utility for extracting spectral modeling parameters in an extremely short time frame.

A Theoretical Analysis of Eddy-Current Effects in Loudspeaker Motors
J. R. Bowler, N. Harfield, N. P. Merricks, and W. J. Woodman 668

Loudspeaker motor eddy-current effects and their contributions to modified voice-coil impedance and third-order harmonic distortion are discussed in this study. A unique method for reducing the eddy-current-related distortion is presented. The magnetic steel pole tips near the voice coil are replaced with a polymer-based, magnetic powder composite of low conductivity to eliminate the eddy currents in the voice coil vicinity. Theoretical and measured results are in very close agreement.

LETTERS TO THE EDITOR

Comments on Review of Architectural Acoustics, Principles and Practice
David Lloyd ben Yaacov Yehuda Klepper 678

STANDARDS AND INFORMATION DOCUMENTS

AES38-2000 AES Standard for Audio Preservation and Restoration - Life Expectancy of Information Stored in Recordable Compact Disc Systems - Method for Estimating, Based on Effects of Temperature and Relative Humidity 679

AES Standards Committee News 706
AES31-3-1999 corrigendum; Los Angeles meetings; IEEE 1394; EMC and grounding; audio file formats; forensic audio; acoustical levels; listening tests; digital audio measurements

FEATURES

109th Convention Preview, Los Angeles 714

Calendar 716

Exhibitors 717

Exhibit Previews 724

110th Convention, Amsterdam, Call for Papers 761

DEPARTMENTS

Review of Acoustical Patents 711

Upcoming Meetings 750

News of the Sections 751

Sound Track 755

Available Literature 756

Membership Information 758

Advertiser Internet Directory 759

Sections Contacts Directory 762

AES Conventions and Conferences 768

FPOFor the cover:

VOLUME 48 NUMBER 7/8 2000 JULY/AUGUST

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