AES Los Angeles 2014
Paper Session P20

P20 - Applications in Audio: Part 2


Sunday, October 12, 1:30 pm — 5:00 pm (Room 309)

Chair:
Alexander Voishvillo, JBL/Harman Professional - Northridge, CA, USA

P20-1 Producing Interactive Immersive Sound for MPEG-H: A Field Test for Sports BroadcastingHanne Stenzel, Fraunhofer Institute for Integrated Circuits IIS - Erlangen, Germany; Universityt for Music and Perfoming Arts - Vienna, Austria; Ulli Scuda, Fraunhofer Institute for Integrated Circuits IIS - Erlangen, Germany
The present paper gives a practical example how broadcast content can be produced for MPEG-H. Existing production workflows are investigated with the question in mind, what needs to be adapted in order to make use of audio objects and immersive 3D-Audio provided by the new broadcast standard. After a short introduction to the features of MPEG-H, practical use cases are presented, such as immersive mixes and interactive personalized audio. In a field test, two sports events were accompanied and original audio material was gathered. Recording methods were tested to see how much additional effort is needed to make use of the mentioned features. The results show that already existing TV productions techniques can be used to provide enough audio material for interactive TV mixes. With little additional effort immersive 3D-audio environments can be created.
Convention Paper 9211

P20-2 Headstock Resonances in the Electric Bass GuitarBryan Martin, McGill University - Montreal, QC, Canada; Centre for Interdisciplinary Research in Music Media and Technology (CIRMMT) - Montreal, QC, Canada; Goran Petrovic, McGill University - Montreal, Quebec, Canada
The solid-body electric bass has long been established as a staple in jazz and popular music. This investigation examines the resonant characteristics of the headstock. Sine sweep techniques are employed to extract resonant characteristics from the headstock and compares these with those of the plucked open strings. It was found that there appears to be a correlation between the integrity of the open string resonances in the headstock with the output sound quality of the instrument.
Convention Paper 9212

P20-3 Requirements Specification for Amplifiers and Power Supplies in Active LoudspeakersHenrik Schneider, Technical University of Denmark - Kgs. Lyngby, Denmark; Lasse C. Jensen, Technical University of Denmark - Kgs. Lyngby, Denmark; Lars Press Petersen, Technical University of Denmark - Kgs. Lyngby, Denmark; Arnold Knott, Technical University of Denmark - Kgs. Lyngby, Denmark; Michael A. E. Andersen, Technical University of Denmark - Kgs. Lyngby, Denmark
This work aims to provide designers with a method to develop a requirements specification for power supplies and amplifiers in active loudspeakers. The motivation is to avoid over-sizing and unnecessary cost. A realistic estimation of the power supplied during playback of audio in a given loudspeaker is obtained by considering a wide range of audio source material, loudness normalization of the source material, crossover filtering, driver characteristics as well as a perceived maximum loudness/volume level. The results from analyzing a sub-woofer and a woofer reveals the peak power, peak voltage, peak current, and apparent power—thus providing a solid foundation for a requirement specification.
Convention Paper 9213

P20-4 Multiphysical Simulation Methods for Loudspeakers—Advanced CAE-Based Simulations of Motor SystemsAlfred Svobodnik, Konzept-X GmbH - Karlsruhe, Germany; Roger Shively, JJR Acoustics, LLC - Seattle, WA, USA; Marc-Olivier Chauveau, Moca Audio - Tours, France
This is the first 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 electromagnetics of loudspeakers will be presented. Primarily, the creation of a useful impedance curve in the virtual world will be demonstrated. The influences of the mechanical mounting will also be illustrated, as well as the inherent non-linearities of the loudspeaker motor. Those non-linearities will be illustrated through the correct simulation of the electromagnetic driving force, which has an influence on all loudspeakers, and the voice coil inductance, which can have a profound influence on midrange and high frequency loudspeakers. Results will be presented, correlating the simulated model results to the measured physical parameters and to the impedance curve. From that, the important aspects of the modeling that determine its accuracy will be discussed.
Convention Paper 9214

P20-5 MotionMix: A Gestural Audio Mixing ControllerJarrod Ratcliffe, New York University - New York, NY, USA
This paper presents a control interface for stereo mixing using real time computer vision. The user’s sense of depth and panorama are improved over the traditional channel strip, while broad accessibility is maintained by integrating the system with Digital Audio Workstation (DAW) software and implementing a system that is portable and affordable. To provide the user with a heightened sense of sound spatialization over the traditional channel strip, the concept of depth is addressed directly using the stage metaphor. Sound sources are represented as colored spheres in a graphical user interface to provide the user with visual feedback. Moving sources back and forward controls volume, while left to right controls panning. Preliminary evaluation is conducted through a pilot study, and user feedback is considered regarding future applications of the interface.
Convention Paper 9215

P20-6 An Associative Shared Memory Approach to Audio Connection ManagementAndrew Eales, Wellington Institute of Technology - Wellington, New Zealand; Rhodes University - Grahamstown, South Africa; Richard Foss, Rhodes University - Grahamstown, Eastern Cape, South Africa
A distributed, associative memory that advertises audio streams and represents audio connections between networked audio devices is described. Characteristic features of a shared, associative memory are discussed, and three parameter-based models that represent audio signals and audio connections are introduced. Connection management is then discussed with reference to a distributed, associative memory environment. This environment allows changes made to audio connections to be automatically propagated to all networked devices, while also eliminating potential race conditions between connection requests. Additionally, connection management applications can be shared between different networked devices and controllers.
Convention Paper 9216

P20-7 Utilizing Gesture Recognition and Ethernet AVB for Distributed Surround Sound ControlMitchell Hedges, Rhodes University - Grahamstown, South Africa; Richard Foss, Rhodes University - Grahamstown, Eastern Cape, South Africa
Gesture recognition has become a preferred approach to the control of various systems. This allows users of the system to interact without having to use any controls or equipment. This paper investigates the use of gesture recognition in order to select and transport audio tracks over an Ethernet AVB network to speaker endpoints. The research uses equipment that is commercially available and relatively cost efficient. The endpoints receive audio samples that are encapsulated within network packets and processes them. The audio tracks are mixed at the endpoints according to gain ratios that will change and be different for each endpoint.
Convention Paper 9217


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