Otoacoustic emissions have historically been measured with an acoustical probe assembly hermetically sealed in the ear canal, imposing in most cases a limited stimulus bandwidth. A physically open recording system should afford the possibility of a greater stimulus bandwidth but the change in acoustical load may affect the magnitude of otoacoustic emissions obtained. Here it is reported that th...

Is the sound of a train whistling more similar to the sound of the wheels of a train or to the sound of your whistle? This question addresses the comparative relevance of acoustical and conceptual information to the perceived similarity of sound events. The answer to this question has theoretical and methodological consequences for the field of sound source perception, and for the behaviorally ...

When we hear a new voice we automatically form a "first impression" of the voice owner's personality; a single word is sufficient to yield ratings highly consistent across listeners. Past studies have shown correlations between personality ratings and acoustical parameters of voice, suggesting a potential acoustical basis for voice personality impressions, but its nature and extent remain uncle...

Magnetic resonance imaging (MRI) devices generate loud acoustical noise during operation. The sound pressure level of the MRI noise depends on the imaging sequence, but it is generally 100 dB or more. Our current study is aimed at the improvement of the acoustical environment for the MRI patient by means of an active noise control system. We propose using a feedforward system because acoustical...

A combined heat and power (CHP) system, which consists of a proton exchange membrane fuel cell an integrated processor is developed based on solving the energy balance between endothermic exothermic hydrogen production reactions. The system simplifies traditional complex processing, only three reactor units are needed—catalytic combustion, new CO removal. In novel CHP H2-rich reformate from met...

OBJECTIVES There are four types of signals that are typical representations of vocal fold vibratory patterns. Type 1 signals are nearly periodic, type 2 signals contain subharmonic properties, type 3 signals are chaotic, and type 4 signals are characterized as white noise. High-speed imaging allows detailed observation of these vocal fold vibratory patterns. Therefore, high-speed imaging can ex...