AES New York 2015
Product Development Track Event EB1

Thursday, October 29, 12:00 pm — 12:45 pm (Room 1A07)

Engineering Brief: EB1 - Transducers—Part 1

Michael Smithers, Dolby Laboratories - Sydney, NSW, Australia

EB1-1 Wireless Speaker Synchronization: SolvedSimon Forrest, Imagination Technologies - Hertfordshire, UK
Many high-end stereo systems offer the opportunity to connect several speakers together wirelessly to create a multi-room audio experience. However, linking speakers wirelessly to create stereo pairs or surround sound systems is technically challenging, due to the extremely tight synchronization necessary to accurately reproduce a faithful sound stage and maintain channel separation. Imagination measures several competing technologies on the market today and illustrates how innovative application of Wi-Fi networking protocols in audio chips can deliver several orders of magnitude improvement, creating opportunity for high quality wireless audio and producing results that are indistinguishable from wired speaker systems.
Engineering Brief 202 (Download now)

EB1-2 Multiphysical Simulation Methods for Loudspeakers—Advanced CAE-Based Simulations of Vibration SystemsAlfred Svobodnik, Konzept-X GmbH - Karlsruhe, Germany; Roger Shively, JJR Acoustics, LLC - Seattle, WA, USA; Marc-Olivier Chauveau, Moca Audio - Tours, France; Tommaso Nizzoli, Acoustic Vibration Consultant - Reggio Emilia, Italy; Dieter Thöres, Konzept-X GmbH - Karlsruhe, Germany
This is the second in a series of papers on the details of loudspeaker design using multiphysical computer aided engineering simulation methods. In this paper the simulation methodology for accurately modeling the structural dynamics of loudspeaker’s vibration systems will be presented. Primarily, the calculation of stiffness, or its inverse the compliance in the virtual world, will be demonstrated. Furthermore, the predictive simulation of complex vibration patterns, e.g., rocking or break-up, will be shown. Finally the simulation of coupling effects to the motor system will be discussed. Results will be presented, correlating the simulated model results to the measured physical parameters. From that, the important aspects of the modeling that determine its accuracy will be discussed.
Engineering Brief 203 (Download now)

EB1-3 New Design Methodologies in Mark Levinson AmpsTodd Eichenbaum, Harman Luxury Audio - Shelton, CT, USA
The HARMAN Luxury Audio electronics engineering team has designed a completely new generation of Mark Levinson amplifiers. Combining tried-and-true technologies with innovative implementations and unique improvements has yielded products with exemplary measured and subjective performance. In this article are circuit design highlights of the No536, a fully balanced mono power amplifier rated for 400W/8 ohms and 800W/4 ohms.
Engineering Brief 204 (Download now)

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