In This Section

AES Store

Learn From The Experts:
Phil Ramone "Music Production"
Oral History Project Gallery
Other AES Publications

Journal Forum

Virtual Localization by Blind Persons - July 2012
1 comment

Effect of Spatial Location and Presentation Rate on the Reaction to Auditory Displays - July 2012
1 comment

Watermark-Aided Pre-Echo Reduction in Low Bit-Rate Audio Coding - June 2012
1 comment

Access Journal Forum

Journal of the AES

2009 December - Volume 57 Number 12

Download Entire Issue (11.4MB) Listen to Podcast

Editor’s Note

Author:John Vanderkooy
Page:1003 Download:PDF (118KB)

Papers

Estimating the Velocity Profile and Acoustical Quantities of a Harmonically Vibrating Loudspeaker Membrane from On-Axis Pressure Data

Authors:Aarts, Ronald M.; Janssen, Augustus J. E. M.
Affiliation:Philips Research Laboratories, Eindhoven, The Netherlands; Eindhoven University of Technology, Department of Electrical Engineering, Eindhoven, The Netherlands
Page:1004

The velocity profiles of rigid pistons, supported radiators, clamped radiators, Gaussian radiators, and real loudspeaker drivers can be approximated using only a few terms of their Zernike expansions. The computed profile allows for the extrapolation of far-field pressure data, including off-axis behavior without requiring the use of anechoic rooms. The authors explore a method to perform forward and inverse sound pressure computations for circular radiators with nonuniform velocity profiles. Acoustic parameters of a harmonically excited resilient, flat, circular loudspeaker in an infinite baffle can thus be computed.

PDF (High Res) (2.6MB) PDF (Low Res) (1.6MB) Be the first to discuss this paper

Psychoacoustic Evaluation of Systems for Delivering Spatialized Augmented-Reality Audio

Authors:Martin, Aengus; Jin, Craig; Schaik, André van
Affiliation:Computing and Audio Research Laboratory, University of Sydney, Sydney, Australia
Page:1016

Spatialized augmented-reality audio systems superimpose virtual sound sources onto sounds from a real acoustic environment. Applications include assistance for visually impaired users, guidance systems, teleconferencing, attention-focusing systems, and electronic games. In the proposed system, acoustically transparent earpieces are used to allow environmental sounds to be heard directly while the virtual reality is created electronically. The results show that the listener can localize virtual sound sources as accurately as when using earphones, which are standard for virtual auditory space presentation, while there is only minor degradation in his ability to localize real sound sources.

PDF (High Res) (6.7MB) PDF (Low Res) (2.0MB) Be the first to discuss this paper

Ensemble Hand-Clapping Experiments under the Influence of Delay and Various Acoustic Environments

Authors:Farner, Snorre; Solvang, Audun; Sæbo, Asbjørn; Svensson, U. Peter
Affiliation:Centre for Quantifiable Quality of Service in Communication Systems, NTNU, Trondheim, Norway
Page:1028

With ensembles composed of musicians connected over large distances via the Internet, the issue of sound delay becomes very important. This study explores the effect of delay on tempo change, imprecision, leader–follower strategy, and quality. Eleven pairs of musically experienced subjects clapped a simple complementary rhythmic pattern together for about 15 seconds while the delay was varied from 6 to 68 ms. Acceptable delay thresholds were empirically determined.

PDF (High Res) (2.6MB) PDF (Low Res) (1.4MB) Discuss this paper (1 comment)

Engineering Reports

FlexSM: A Flexible Sinusoidal Modeling System

Authors:Nunes, Leonardo O.; Esquef, Paulo A. A.; Biscainho, Luiz W. P.
Affiliation:Universidade Federal do Rio de Janeiro, COPPE, Rio de Janeiro, RJ, Brazil; National Laboratory for Scientific Computing, Department of Systems and Control, Petrópolis, RJ, Brazil
Page:1042

A system, called FlexSM, is proposed, which is a unified yet flexible platform for developing, testing, and comparing existing as well as new algorithms for sinusoidal analysis of audio. FlexSM, which is implemented in Matlab, offers a graphical user interface and a report generator to aid system configuration and visual assessment of the results.

PDF (High Res) (3.3MB) PDF (Low Res) (1.2MB) Be the first to discuss this report

Standards and Information Documents

AES Standards Committee News

Page:1057 Download:PDF (94KB)

Audio applications of networks; transfer technologies; digital library and archive systems; forensic audio; loudspeaker modeling and measurement; microphone measurement and characterization

Features

37th Conference Report, Hillerød

Page:1060 Download:PDF (2.0MB)

127th Convention Report, New York

Page:1068 Download:PDF (2.6MB)

127th Convention Exhibitors

Page:1082 Download:PDF (299KB)

Class D Power Amplification

Author:Rumsey, Francis
Page:1087

Class D power amplifiers are rapidly becoming the technology of choice for audio products. Integration of these amplifiers in CMOS (complementary metal oxide semiconductor) designs for portable devices requires careful treatment if audio power output is to be maximized for minimal power consumption, while at the same time ensuring low electromagnetic interference and protection of loudspeakers. Papers from the 37th International Conference dealing with these themes are summarized, showing that effective solutions can be developed.

PDF (714KB) Discuss this feature (3 comments)