AES Conventions and Conferences



Friday, September 22, 2:00 pm
W1: Small Room Acoustics (Tutorial)
Chair: Jan Voetmann, DELTA Acoustics and Vibration, Lyngby, Denmark
Presenters: S�ren Bech; David Griesinger; David Moulton; Jiri Tichy; Bob Walker
This workshop opened with a tutorial in basic room acoustics followed by four presentations addressing important issues in small room acoustics. Recent approaches to solving acoustical problems were shown. The fundamentals of acoustics were explored and discussed by a group of internationally respected acousticians.
Friday, September 22, 2:00 pm
W2: Speech Intelligibility of Public Address/Audio Systems
Chair: Peter Mapp, Peter Mapp Associates, Colchester, Essex, UK
This workshop focused on the influence of loudspeaker design and application combined with acoustic characteristics on the perceived intelligibility of speech. Aspects such as loudspeaker directivity, frequency response and distortion will be discussed, together with the effects of signal-to-noise and direct-to-reflecting ratios. Methods of measurement and prediction were also presented after an illustrated introductory talk presenting current knowledge. The discussion was helpful to loudspeaker manufacturers, PA system operators, and sound reinforcement system designers.
Saturday, September 23, 9:00 am
W3: Audio Watermarking for Packaged and Network Media
Chair: Tony Faulkner, Green Room Productions, London, UK
Panelists: Karlheinz Brandenburg, M.O.J Hawksford, Paul Jessop, George Massenburg, Al McPherson, Glen Meadows and Joseph M. Winograd
This highly topical presentation on audio watermarking has important implications for future economic models of music distribution. Watermarking technologies must be simultaneously inaudible to the listener and traceable through various data compression schemes. Presenters demonstrated examples of current approaches with practical applications. A lively discussion followed.
Saturday, September 23, 9:00 am
W4: Mastering for the Internet
Chair: Dave Harris, StarMedia Broadband, San Francisco, CA, USA
Panelists: Bernard Grill; Rick Schwartz; David Wheeler
Webcasting, or the streaming of audio and video over the Internet, has emerged as a new industry with new opportunities for audio professionals. Just as audio is mastered for traditional delivery formats such as vinyl, cassette and CD, Internet delivery has its own set of issues. This workshop covered different methods for optimizing audio for a range of streaming codecs. Panelists represented major tool developers and audio professionals who work with streaming audio everyday.
Saturday, September 23, 3:00 pm
W5: High Resolution Audio
Chair: Malcolm Hawksford, University of Essex, Colchester, Essex, UK
Panelists: Kevin Halverson; Jim Johnston; Siegfried Linkwitz; Vicki Melchior; Mike Story; Bob Stuart; Takeo Yamamoto
This workshop addressed the key issues of high-resolution audio acquisition, storage and playback. Examples of high-resolution audio were presented and panelists discussed the impact of these technologies on working methods and final delivery. The workshop set the stage for small listening room demonstrations of high-resolution audio, which were available throughout the convention.
Saturday, September 23, 2:00 pm
W6: Digital Libraries, Preservation and Metadata
Chair: Elizabeth Cohen, Cohen Acoustical, Los Angeles, CA, USA
Panelists: Richard Bradshaw; Peggy Bulger; Mike Christel; Werner Deutsch; Henry Gladney; Mickey Hart; Steve Lymam
Preserving, storing and retrieving audio are increasingly important parts of asset management. This workshop explores the artistic and technical challenges of storing and retrieving audio programs. Various solutions for digital audio library management will be shown. Topics included the future of optical and magneto-optical media, media longevity, data migration, development of digital libraries and data management. Workshop participants discussed the magnitude of the digitization challenge, data migration policies, the implementation of digital libraries, and how we find an audio object that we are interested in without massive games of bit tag.
Sunday, September 24, 9:00 am
W7: Microphones-How They Work and How to Put Them to Work for You (Tutorial)
Chair: Ron Streicher, Pacific Audio-Video Enterprises, Monrovia, CA, USA
Panelists: Wes Dooley; John Eargle; Juergen Wahl
The focus of this tutorial workshop was a comprehensive review of the broad range of factors that determine how microphones work. Emphasis was given to practical methods for applying these complex tools to your recording or sound reinforcement project. Among the topics for discussion were the basic operating principles of microphones as transducers, how to make best use of polar patterns, the physical characteristics and limitations of microphones, powering systems, and other related pragmatic issues including microphone mounting hardware, cables, windscreens, etc. The workshop included numerous practical examples and demonstrations.
Sunday, September 24, 9:00 am
W8: System Problem Solving with Alternative Transducers
Chair: John Stewart, Harman Motive, Inc., Martinsville, IN, USA
Panelists: Thomas Danley; Neil Harris; Klaus Heinz; Tony Hooley; Roger Sanders; Bruce Thigpen
The form factor and performance characteristics of common direct radiator transducer designs do not always meet the needs of every application. This workshop presented alternative approaches to putting air in motion and show how these approaches can be applied to problematic system issues. What options are available to the system designer? An eclectic collection of manufacturers and experimenters demonstrated transducers that reproduce sound without axial pistonic motion. A listening experience, along with a brief tutorial explaining each technology and its advantages, was provided. This workshop offered a unique opportunity to see and hear these transducers first hand.
Sunday, September 24, 2:00 pm
W9: Perceptual Audio Coders-What to Listen For
Chair: Markus Erne, Swiss Federal Institute of Technology, Zurich, Switzerland
Low bit-rate audio coding has become a widely used technology during recent years. Due to the use of sophisticated signal processing techniques exploiting psychoacoustic phenomena, non-transparent coding results in artifacts that sound very different from traditional distortions and are frequently not obvious at all to the untrained listener. The workshop presented the work of the AES Technical Committee on Coding of Audio Signals, which aims at explaining different types of coding artifacts and making a collection of such sound material available to the public. Attendees left with a better understanding of how to identify and evaluate these artifacts.
Sunday, September 24, 3:00 pm
W10: Everything You Ever Wanted to Hear About Loudspeakers (Tutorial)
Chair: Justin Baird, Meyer Sound Laboratories, Berkeley, CA, USA
Invited Panelists: Durand Begault; Wolfgang Klippel; Bob McCarthy; David McGrath; David Wessel
The loudspeaker has always played a special role in the ever-changing audio industry. For the majority of sound reinforcement applications, loudspeaker systems continue to be the final filter in the audio path. All of the improvements in the quality of audio processing are for naught if the reproduction of the signal is not accurate. How do we insure that the loudspeaker faithfully provides the desired end result? This is the subject of our discussion. We will survey the current technological trends in loudspeaker processing and design, and find out how these tools help to provide a subjectively transparent reproduction of the desired sound field. We also discussed practical methods for subjective loudspeaker testing.
Monday, September 25, 9:00 am
W11: Mastering and Authoring for High Resolution Audio
Chair: Garry Margolis, Consultant, Los Angeles, CA, USA
DVD-Audio and Super Audio CD, the new high-resolution consumer audio formats, have introduced new challenges for the preparation of content for commercial release. Mastering and authoring for these new formats will be explored by a panel of engineers who are involved in the creation of the discs.
Monday, September 25, 9:00 am
W12: How Many Loudspeaker Channels are Enough?
Chair: Chris Cain, University of Southern California, Los Angeles, CA, USA
Panelists: David Griesinger, Tomlinson Holman
The increasing data rates and capabilities of delivery systems enable the audio designer more options when it comes to how the audio budget is distributed. There are differing opinions on the necessity and feasibility of the number of channels and relative positions of loudspeakers which are required to accurately reproduce a naturally occurring soundfield. This workshop brought together the leaders in the field of soundfield reproduction to explore and demonstrate the possibilities. This was an open forum for comments on the future of sound reproduction.
Monday, September 25, 2:00 pm
W13: Auditory-Visual Interaction
Co-chairs: Durand Begault, NASA Ames Research Center, Moffett Field, CA, USA; Armin Kohlrausch, Philips Research Laboratories, Eindhoven, The Netherlands
Panelists: Myra van Esch-Bussemakers, Armin Kohlrausc, Dominique Massaro, Russell Storms, Elizabeth Wenzel
An understanding of image, sound and movement perception is vital for the successful design and application of audio/visual systems. Examples included multimedia entertainment, gaming, soundscape analysis, teleconferencing, virtual reality and user-system interaction. This workshop brought together professionals from the research and professional application communities who defined relevant areas and methodologies and discussed the significant issues of audio/visual interaction. The emphasis was on differences and commonalities arising between questions of different application contexts. The audience was encouraged to interact with the panel in a question and answer session.

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