نتایج جستجو برای: equivalent sound pressure level

تعداد نتایج: 1647037  

2014

Scope Sufficient acoustic quality of speech communication is very important in many different situations and places; classrooms in schools, auditoria, PA systems in public buildings, alert and warning systems in noisy environments etc. Speech transmission index (STI) is an objective method for prediction and measurement of speech intelligibility. This is a guide how to use ODEON for calculating...

Journal: :International journal of occupational safety and ergonomics : JOSE 2013
Rafał Młyński Emil Kozłowski

Determining the effectiveness of impulse noise attenuation with hearing protection devices (HPDs) is an important part of their selection. Measuring impulse noise parameters under an HPD would involve exposing subjects to impulses with a high peak sound pressure level. This paper presents a computational method of determining impulse noise parameters under the cups of earmuffs. Calculations are...

Journal: :The Journal of the Acoustical Society of America 2015
Huiqun Deng Jun Yang

The acoustic transfer functions of external ears with or without headphones affect the features of perceived sounds and vary considerably with listeners and headphones. A method for estimating the frequency responses of external-ear transfer functions from the sound at the entrance of a blocked ear canal (or from the input of a headphone) to the sound at the eardrum for different listeners and ...

2014
N. Garg S. K. Mangal

This paper reviews the strategies so far recommended for modeling road traffic noise in India. An analytical model is developed to predict road traffic noise for busy roads of Delhi, India. Equivalent continuous sound pressure level, LAeqT is analyzed at different busy road locations of Delhi. A multiple linear regression analysis is conducted to predict the noise metrics LAeq, TNI and NPL in t...

رحیمی فروشانی, عباس, نصیری, پروین, یوسف زاده, ارسلان,

Introduction: Noise pollution in urban areas has been recognized as a major problem. Since hearing damages are the main concern of noise exposure, other physical and psychological effects should not be ignored. Noise-induced annoyance and consequently its side-effects, such as fatigue and loss of concentration, would increase the probability of human errors occurrence and occasionally irreversi...

1997
Ruth A. Etzel Sophie J. Balk Cynthia F. Bearer Mark D. Miller Katherine M. Shea

Noise is ubiquitous in our environment. High intensities of noise have been associated with numerous health effects in adults, including noise-induced hearing loss and high blood pressure. The intent of this statement is to provide pediatricians and others with information on the potential health effects of noise on the fetus and newborn. The information presented here supports a number of reco...

Journal: :Medycyna pracy 2002
Wiesław Konopka Małgorzata Pawlaczyk-Łuszczyńska Piotr Zalewski Jarosław Miłoński

The aim of the study was to assess the acoustic environment of soldiers attending a one year basic military service. The study material comprised 13 types of weapons used by this group of soldiers. During the target practice, the following parameters were measured separately for the right ear and the left ear: equivalent sound pressure level A (LA eq, Te); maximum sound pressure level A (LA F m...

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