PO 107‐1 Design, Development and Evaluation of a Noise Control Enclosure for a Model Jet Engine J. Black, J. Rinker, R. Yon, C. Holder, U.S. Air Force, Wright‐Patterson AFB, OH; J. Slagley, School of Aerospace Medicine, Wright‐ Patterson AFB, OH. Situation/problem: A cart‐mounted model jet engine used for educational demonstrations produced a sound pressure level (SPL) of 89.1 dB at a distance...

Recently, exploring acoustic conditions of people in their everyday environments has drawn a lot attention. One the most important and disturbing sound sources is test participant’s own voice. This contribution proposes an algorithm to determine own-voice audio segments (OVS) for blocks 125 ms method measuring pressure levels (SPL) without violating privacy laws. The voice detection (OVD) here ...

background : noise exposure is the most frequent occupational factor which may increase the risk of work-related injuries. the purpose of this study was to estimate the association between occupational injuries and noise exposure as well as hearing loss. methods : this study was conducted from april 2008 to march 2009 on 1062 workers in the tabriz tractor manufacturing plant. sound pressure lev...

BACKGROUND A sound generator based on a double-membrane design that fits into a regular tracheoesophageal shunt valve may improve voice quality after total laryngectomy in patients rehabilitated with surgical voice prostheses. METHODS Voice-producing element (VPE) prototypes were manufactured using medical grade biocompatible materials and tested in vitro under physiological conditions. RES...

OBJECTIVES Vocally trained actresses are expected to have more vocal economy than nonactresses. Therefore, we hypothesize that there will be differences in the electroglottogram-based voice economy parameter quasi-output cost ratio (QOCR) between actresses and nonactresses. This difference should remain across different levels of intensity. METHODS A total of 30 actresses and 30 nonactresses ...

Purpose: To calculate the real-ear insertion gain (REIG) according to types of hearing aids, we evaluated preferred REIGs Korean hearing-impaired listeners and psychoacoustic differences between open-canal fitting (OF) closed-canal (CF).Methods: The subjects with sensorineural loss were divided into OF group (4 monaural fittings, 15 binaural fittings 34 ears), CF (8 13 ears). There no statistic...

This article reports the discovery of a new genus and three species of predaceous katydid (Insecta: Orthoptera) from Colombia and Ecuador in which males produce the highest frequency ultrasonic calling songs so far recorded from an arthropod. Male katydids sing by rubbing their wings together to attract distant females. Their song frequencies usually range from audio (5 kHz) to low ultrasonic (...

OBJECTIVES Firearm is a common source of impulse noise that may potentially damage hearing organ. It has been suggested that otoacoustic emissions, particularly transient-evoked otoacoustic emissions (TEOAE), might be more sensitive than pure-tone audiometry (PTA) in the assessment of changes to cochlea caused by noise. The aim of this study was to: (i) evaluate exposure to impulse noise from s...

In the auditory system of bushcrickets, sound can reach the receptors via two different paths: (i) by acting on the outside of the tympana situated on both sides of each foreleg or (ii) through the acoustic trachea that opens at a spiracle on the thorax. While the spiracle is considered to be the main point of sound entry for higher audio and ultrasonic frequencies, the role of the tympana is s...