AES New York 2011
Paper Session P12

P12 - Loudspeaker Reproduction

Friday, October 21, 2:00 pm — 4:00 pm (Room: 1E09)

John Vanderkooy

P12-1 Size and Shape of Listening Area Reproduced by Three-Dimensional Multichannel Sound System with Various Numbers of LoudspeakersIkuko Sawaya, Satoshi Oode, Akio Ando, Kimio Hamasaki, NHK Science and Technology Research Laboratories - Setagaya, Tokyo, Japan
A wide listening area is necessary so that several people can listen to a multichannel sound program together. It is considered that the size of the listening area depends on the number of loudspeakers. To examine the relationship between the number of loudspeakers and the size of listening area that maintains spatial impression at the center of a three-dimensional multichannel sound, two subjective evaluation experiments were carried out. The first experiment showed that the size of the listening area increases by increasing the number of loudspeakers. The second experiment showed that the shape of the listening area is dependent on the locations of loudspeakers. On the basis of the experimental results, a new parameter for estimating the shape of listening area is proposed.
Convention Paper 8510 (Purchase now)

P12-2 Numerically Optimized Touring Loudspeaker Arrays—Practical ApplicationsAmbrose Thompson, Jason Baird, Bill Webb, Martin Audio - High Wycombe, UK
We describe the implementation of a user guided automated process that improves the quality and consistency of loudspeaker array deployment. After determining basic venue geometry a few easily understood goals for regions surrounding the array are specified. The relative importance of the goals is then communicated to the optimization algorithm in an intuitive manner. Some representative examples are presented, initially optimized with default coverage goals. We then impose extra requirements such as changing the coverage at the last moment, avoiding noise sensitive regions and demanding a particularly quiet stage.
Convention Paper 8511 (Purchase now)

P12-3 Vertical Loudspeaker Arrangement for Reproducing Spatially Uniform SoundSatoshi Oode, Ikuko Sawaya, Akio Ando, Kimio Hamasaki, Japan Broadcasting Corporation - Setagaya, Tokyo, Japan; Kenji Ozawa, University of Yamanashi - Kofu, Yamanashi, Japan
It was recently recognized that the loudspeaker arrangement of multichannel sound systems can be vertically expanded to improve the spatial impression. This paper discusses the relationship between the vertical interval between loudspeakers placed in a semicircle above ear height and the impression of spatially uniform sound, as part of a study of three-dimensional multichannel sound systems. In total, 24 listeners evaluated the spatial uniformity of white noise reproduced by loudspeakers arranged in vertical semicircles at equal intervals of 15°, 30°, 45°, 60°, 90° or 180°, and with azimuthal angles of 0°, 45°, or 90°. Loudspeakers arranged with vertical intervals that were less than 45° were found to reproduce spatially uniform sound for all of the azimuthal angles tested.
Convention Paper 8512 (Purchase now)

P12-4 Multichannel Sound Reproduction in the Environment for Auditory ResearchMark A. Ericson, Army Research Laboratory - Aberdeen Proving Ground, MD, USA
The Environment for Auditory Research (EAR) is a new U.S. Army Research Laboratory facility at Aberdeen Proving Ground, Maryland, dedicated to spatial sound perception and speech communication research. The EAR is comprised of four indoor research spaces (Sphere Room, Dome Room, Distance Hall, and Listening Laboratory), one outdoor research space (Open EAR), and one common control center (Control Room). Digital audio signals are routed through state-of-the-art RME Hammerfall DSP and Peavey MediaMatrix® hardware to over 600 loudspeakers and microphone channels throughout the facility. The facility’s acoustic environments range from anechoic, through various soundscapes, to real field environments. The EAR facility layout, the audio signal processing capabilities, and some current research activities are described.
Convention Paper 8513 (Purchase now)

Information Last Updated: 20111005, mei

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