Acoustic Shock describes a condition where sudden loud acoustic signals in communication equipment causes hearing damage and discomfort to the users. To combat this problem, a subband-based acoustic shock limiting (ASL) algorithm is proposed and implemented on an ultra low-power DSP system with an input-output latency of 6.5 msec. This algorithm processes the input signal in both the time and f...

A numerical study is conducted to investigate fluidic control for transonic flow over an open cavity. Numerical results are obtained for the unsteady threedimensional flow with different steady mass injection rates upstream of the cavity. The simulations use a hybrid two-equation turbulence model in the Detached Eddy Simulations (DES) to calculate the flow and acoustic fields. Computational res...

Introduction The acoustic noise during image acquisition is a well-known problem in MRI, which is especially pronounced during fast imaging with high gradient slew rates and at high field strengths. Patients can be exposed to sound pressure levels (SPL) as high as 130 dB [1] and more on clinical 3 Tesla MR systems. As the SPL increases linearly with gradient amplitude [2] the SPL of a 7T System...

In this paper, synthetic jet actuators (SJAs) with three different orifice shapes (circular, square, and slot) the same cross-section area were investigated. The SJA efficiency (SJ) Reynolds number calculated based on time-mean reaction force measurement. momentum velocity was measured hot-wire anemometry additionally, sound pressure level (SPL) measured. equal maximally to 5.3% for each shape,...

To categorize variation in disturbance calls of the weakfish Cynoscion regalis and to understand their generation, we recorded sounds produced by different-sized fish, and by similar-sized fish at different temperatures, as well as muscle electromyograms. Single, simultaneous twitches of the bilateral sonic muscles produce a single sound pulse consisting of a two- to three-cycle acoustic wavefo...

The problem of solar irradiation in building façades with large windows is often solved with the use of external shading devices, such as brise-soleil systems, but their potential acoustic effects on building façades are usually neglected. The purpose of this work is a preliminary consideration of the acoustic behaviour of brise-soleil systems and, furthermore, the evaluation of the possibility...

This study was designed to determine the effect of stimulated vocal loudness on nasalance in individuals with various dysarthria subtypes. Thirty participants produced three stimulated levels of vocal loudness while reading a nonnasal passage. Data included dysarthria classification, vocal sound pressure level, nasalance, and listener perception of nasality. There was not a predictable relation...

background: noise pollution is currently a major health risk factor for workers in industries. the aim of this study was to investigate noise pollution and implement a control intervention plan for blast furnace in a steel industry. methods: the measurement of sound pressure level (spl) along with frequency analysis was done with the sound-level-meter cell-450 . personal noise exposure was perf...

we investigated the issue of noise pollution in the bidboland gas refineryby noise measurement and surveys. the bidboland gas refinery has several process units.the sound pressure levels were measured at several places, such as units of 200, 300,400, 500, boiler, powerhouse area, cooling towers pumps, and maintenance area, and thecorresponding noise maps were produced by using sound plan softwa...

noise is a common and widespread problem in workplaces. noise can lead to hearing loss, hypertension, nervous and mental disorders, annoyance and stress, sleep disturbance, negative impact on productivity and working capacity. the undesirable effects of noise on an individual or group are called annoyance. some personal and social characteristics can affect on annoyance. this study was aimed to...