AES New York 2007
Applications in Audio, Part 2
Paper Session P23
Monday, October 8, 1:00 pm — 3:30 pm
Chair: Juha Backman, Nokia Corporation - Espoo, Finland
P23-1 Loudspeaker Systems for Flat Television Sets—Herwig Behrends, Werner Bradinal, Christoph Heinsberger, NXP Semiconductors - Hamburg, Germany
The rapidly increasing sales of liquid crystal- and plasma display television sets lead to new challenges to the sound processing inside the TV-sets. Flat cabinets do not sufficiently accommodate room for loudspeakers that are able to reproduce frequencies below 100 to 200 Hz without distortions and with a reasonable sound pressure level. Cost reduction forces the set makers to use cheap and small loudspeakers, which are in no way comparable to the loudspeakers used in cathode ray tube televisions. In this paper we will describe the trends and the requirements of the market and discuss different approaches and a practical implementation of a new algorithm, which tackle these problems.
Convention Paper 7302 (Purchase now)
P23-2 Loudspeakers for Flexible Displays—Takehiro Sugimoto, Kazuho Ono, NHK Science & Technical Research Laboratories - Setagaya-ku, Tokyo, Japan; Kohichi Kurozumi, NHK Engineering Services - Setagaya-ku, Tokyo, Japan; Akio Ando, NHK Science & Technical Research Laboratories - Setagaya-ku, Tokyo, Japan; Akira Hara, Yuichi Morita, Akito Miura, Foster Electric Co., Ltd. - Akishima, Tokyo, Japan
Flexible displays that can be rolled up would allow users to enjoy programs wherever they are. NHK Science & Technical Research laboratories have been developing flexible displays for mobile television. The loudspeaker for such televisions must have the same features as the displays; they must be thin, lightweight, and flexible. We created two types of loudspeakers; one was made of polyvinylidene fluoride and the other used electro-dynamic actuators. Their characteristics were demonstrated to be suitable for mobile use and promising for flexible displays.
Convention Paper 7303 (Purchase now)
P23-3 Software-Based Live Sound Measurements, Part 2—Wolfgang Ahnert, Stefan Feistel, Alexandru Radu Miron, Enno Finder, Ahnert Feistel Media Group - Berlin, Germany
In previous publications the authors introduced the software-based measuring system EASERA to be used for measurements with prerecorded music and speech signals. This second part investigates the use of excitation signals supplied from an independent external source in real-time. Using a newly developed program module live-sound recordings or speech and music signals from a microphone input and from the mixing console can be utilized to obtain impulse response data for further evaluation. New noise suppression methods are presented that allow these impulse responses to be acquired in full-length even in occupied venues. As case studies, room acoustic measurements based on live sound supply are discussed for a concert hall and a large cathedral. Required measuring conditions and limitations are derived as a result.
Convention Paper 7304 (Purchase now)
P23-4 A System for Remote Control of the Height of Suspended Microphones—Douglas McKinnie, Middle Tennessee State University - Murfreesboro, TN, USA
An electrically driven pulley system allowing remote control of the height of cable-suspended microphones is described. It can be assembled from inexpensive and readily available component parts. A reverse block-and tackle system is used to allow many meters of cable to be drawn into a 1.2 meter long space, allowing the cable to remain connected and the microphone to remain in use during movement. An advantage of this system is that single microphones, stereo pairs, or microphone arrays can be remotely positioned "by ear" during rehearsal, soundcheck, or warmup.
Convention Paper 7305 (Purchase now)
P23-5 Music at Your Fingertips: An Electrotactile Fader—Jörn Loviscach, Hochschule Bremen (University of Applied Sciences) - Bremen, Germany
Tactile sensations can be invoked by applying short high-voltage low-current electrical pulses to the skin. This phenomenon has been researched extensively to support visually or hearing impaired persons. However, it can also be applied to operate audio production tools in eyes-free mode and without acoustical interferences. The electrotactile fader presented in this paper is used to indicate markers or to “display” a track’s short-time spectrum using five electrodes mounted on the lever. As opposed to mechanical solutions, which may for instance involve the fader’s motor, the electrotactile display neither causes acoustic noise nor reduces the fader’s input precision due to vibration.
Convention Paper 7306 (Purchase now)
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