نتایج جستجو برای: phase noise reduction

تعداد نتایج: 1222541  

Journal: :International Astronomical Union Colloquium 1979

ژورنال: سلامت کار ایران 2017

Background and aims Nominal noise reduction rating of the earmuff manufacturers can be different compared with the actual noise attenuation rating. The current study aimed to determine the actual noise reduction rate of current hearing protection devices in the real workplaces using a field microphone in real ear method (FMIRE). Methods: In this cross-sectional study, five common earmuffs we...

Journal: :Nature Chemical Biology 2020

Introduction:One of the recommended methods for evaluation effectiveness of hearing protection is use the acoustic fixture accordance with standard ISO 4869-3. The aim of this study was evaluate the acoustic performance of fixture for using in noise reduction rate  tests of hearing protection devices in the laboratory. Methods: In this cross-sectional study , noise reduction rates o...

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