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Dinosaur hearing, listening to muscle noise, quieter cubicles

lto:kausel@mdw.ac.at">kausel@mdw.ac.at) will present growing experimental evidence that wall vibrations and thickness are important (4pMU2).

REDUCING NOISE IN MRI SCANNERS

Magnetic resonance imaging (MRI) scanners are becoming an increasingly useful medical tool. However, they produce very loud noise that may pose a hazard to both participants and scanner operators. Acoustical researchers are devising various approaches to making the machines quieter. A UK team (including Deborah Hall, MRC Institute of Hearing Research, Nottingham, d.hall@ihr.mrc.ac.uk) will present an active noise control system that cancels out some of the sound from the machines. The system takes into account known properties of the MRI machine sound and counteracts them. When tested with human listeners, the system reduced noise levels and improved audibility conditions for sounds, without interfering with the MRI's scanner's image quality (4pPP16).

TURNING VOICE LESSONS INTO A SCIENCE

Drawing from knowledge of acoustics and human anatomy, researchers in session 2pMUa will discuss the latest ideas for teaching voice students to improve their singing. California-based master voice instructor Lisa Popeil (lisa@popeil.com) will explain how a singer can hear and produce three important frequency bands of harmonics: ring (2500-3500 Hz), which helps singers to project their voices in an unamplified setting; brightness (5-15 kHz), important for conveying certain emotions such as happiness; and nasality (200-2000 Hz), which is becoming used as a popular commercial style for enhancing emotion. Brian Monson of the University of Arizona (bbmonson@email.arizona.edu) will discuss the idea of teaching voice students to reach vocal resonances by training them to achieve a 1:6 ratio in the areas of two anatomical regions: the
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Source:American Institute of Physics


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