Human subject investigation of MIRE microphone location during insertion loss testing of Active Noise Reduction hearing protectors in active and passive modes

2009 ◽  
Vol 57 (5) ◽  
pp. 442 ◽  
Author(s):  
Chuck H. Perala ◽  
John G. Casali
Keyword(s):  
Noise Reduction ◽  
Insertion Loss ◽  
Human Subject ◽  
Active Noise ◽  
Active Noise Reduction ◽  
Hearing Protectors

Methods of measuring the insertion loss of active noise reduction devices

2006 ◽  
Vol 120 (5) ◽  
pp. 3160-3160
Author(s):  
Dan Gauger ◽  
Elliott Berger ◽  
Ronald Kieper ◽  
John Casali ◽  
Chuck Perala
Keyword(s):  
Noise Reduction ◽  
Insertion Loss ◽  
Active Noise ◽  
Active Noise Reduction

scholarly journals Active noise reduction for circumaural hearing protectors by digital feedforward control

1994 ◽  
Vol 96 (5) ◽  
pp. 3274-3274
Author(s):  
G. J. Pan ◽  
A. J. Brammer ◽  
J. Ryan ◽  
J. Zera ◽  
R. Goubran
Keyword(s):  
Noise Reduction ◽  
Feedforward Control ◽  
Active Noise ◽  
Active Noise Reduction ◽  
Hearing Protectors

Active Noise Reduction Algorithm Based on NOTCH Filter and Genetic Algorithm

2013 ◽  
Vol 38 (2) ◽  
pp. 185-190 ◽  
Author(s):  
Paweł Górski ◽  
Leszek Morzyński
Keyword(s):  
Genetic Algorithm ◽  
Noise Reduction ◽  
Reference Signal ◽  
Notch Filter ◽  
Signal Frequency ◽  
Notch Filters ◽  
Active Noise ◽  
Active Noise Reduction ◽  
Hearing Protectors ◽  
Narrow Frequency Band

Abstract Application of active noise reduction (ANR) systems in hearing protectors requires the use of control algorithms to ensure stability of the ANR system and at the same time highly effective active noise reduction. A control algorithm based on NOTCH filters is an example of solutions that meet these criteria. Their disadvantage is operation over a narrow frequency band and a need for prior determination of frequencies to be reduced. This paper presents a solution of the ANR system for hearing protectors which is controlled with the use of modified NOTCH filters with parameters determined by a genetic algorithm. Application of a genetic algorithm allows to change the NOTCH filter reference signal frequency, and thus, adapt the filter to the reduced signal frequency.

Insertion loss testing of active noise reduction headsets using acoustic fixture

2003 ◽  
Vol 64 (10) ◽  
pp. 1011-1031 ◽  
Author(s):  
Jie Cui ◽  
Alberto Behar ◽  
Willy Wong ◽  
Hans Kunov
Keyword(s):  
Noise Reduction ◽  
Insertion Loss ◽  
Active Noise ◽  
Active Noise Reduction

Technology Advancements in Hearing Protection: Active Noise Reduction, Frequency/Amplitude-Sensitivity, and Uniform Attenuation

1992 ◽  
Vol 36 (3) ◽  
pp. 258-262 ◽  
Author(s):  
John Gordon Casall
Keyword(s):  
Noise Reduction ◽  
Hearing Protection ◽  
Speech Communication ◽  
Transmission Frequency ◽  
Active Noise ◽  
Operational Characteristics ◽  
Active Noise Reduction ◽  
Hearing Protectors ◽  
Technological Developments ◽  
Protection Devices

Conventional hearing protection devices have often been implicated in compromised auditory perception, degraded signal detection, and reduced speech communication abilities. Recent technological developments have been used to augment hearing protectors in an attempt to alleviate these problems for the user, while at the same time providing adequate attenuation. Operational characteristics, design features, performance data, and applications for active noise reduction, sound transmission, frequency-selective, adjustable attenuation, amplitude-sensitive, and uniform attenuation devices are discussed.

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