Journal ArticleDOI
On spatial variability in the attenuation performance of active hearing protectors
P.D. Wheeler,D. Smeatham +1 more
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TLDR
Experimental data are presented to illustrate the effects of alternative design approaches to the problem of variability in cancellation achieved throughout the ear-muff cavity, and consequently the level of attenuation perceived by the user.About:
This article is published in Applied Acoustics.The article was published on 1992-01-01. It has received 4 citations till now. The article focuses on the topics: Attenuation.read more
Citations
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Journal ArticleDOI
Comparison between subjective and objective measures of active hearing protector and communication headset attenuation
TL;DR: Differences between physical and subjective measurements of up to 20 dB have been obtained in this study at frequencies of 250 Hz and below for a device in which the sound pressure varied substantially near, and within, the ear canal.
Journal ArticleDOI
Performance analysis of an adaptive feedback active noise control based earmuffs system
TL;DR: In this article, the performance of adaptive feedback active noise control (FBANC) based earmuffs system is analyzed in a closed-form equation with respect to two top-level design constraining parameters, i.e., secondary path delay and noise bandwidth.
Proceedings ArticleDOI
A Method of Sound Field Control Using Beam Deflection
Xian Zhang,Jianlong Li +1 more
TL;DR: In this article, a method of sound field control using beam deflection to overcome the shortcomings of traditional active noise control system is presented. But, due to the energy conservation law, traditional active noises control system cannot realize the suppression of omnidirectional sound field and will bring fluctuation effect in the far field.
Dissertation
Adaptive Control Using IIR Lattice Filters
TL;DR: This work is a study of a hybrid adaptive controller that blends fixed feedback control and adaptive feedback control techniques and it is demonstrated that the lattice filter algorithm performs slightly better than the LMS filter algorithm in all three disturbance cases.
References
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Journal ArticleDOI
Influence of physiological noise and the occlusion effect on the measurement of real‐ear attenuation at threshold
E. H. Berger,J. E. Kerivan +1 more
TL;DR: The most commonly alleged experimental artifact associated with real-ear attenuation at threshold (REAT) measurements of hearing protection devices (HPDs) was examined and no evidence was found in the data to suggest a dependency of HPD attenuation on sound level.
An active noise reduction system for aircrew helmets
P. D. Wheeler,S. G. Halliday +1 more
TL;DR: An active noise reduction system was developed for use in aircrew flying helmets in which the acoustic noise field inside the ear Defender is detected using a miniature microphone and an antiphase signal is fed back to a communications telephone within the ear defender.