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.

Issues Relating to the Conduct of Empirical Research into the Detection of Auditory Stimuli in Noise When Wearing Nontraditional Hearing Protectors

2000 ◽  
Vol 44 (22) ◽  
pp. 722-725 ◽  
Author(s):  
Gary S. Robinson ◽  
John G. Casali
Keyword(s):  
Past Research ◽  
Auditory Stimuli ◽  
Hearing Protection ◽  
Noisy Environments ◽  
Methodological Issues ◽  
Active Noise ◽  
Auditory Detection ◽  
Active Noise Reduction ◽  
Hearing Protectors ◽  
Protection Devices

Nontraditional hearing protection devices are intended to improve the audibility of auditory stimuli in noisy environments. However, when tested in controlled laboratory settings, such benefits are not always apparent. The characteristics of active noise reduction, amplitude-sensitive, and other augmented HPDs are briefly described. Next, the results of past research are discussed, as are the reasons why such results are not always as expected. Finally, methodological issues encountered when conducting auditory detection studies using nontraditional hearing protection will be addressed, including choice of noise spectra, workload, and psychophysical methods.

Hybrid feedforward-feedback active noise reduction for hearing protection and communication

2006 ◽  
Vol 120 (4) ◽  
pp. 2026-2036 ◽  
Author(s):  
Laura R. Ray ◽  
Jason A. Solbeck ◽  
Alexander D. Streeter ◽  
Robert D. Collier
Keyword(s):  
Noise Reduction ◽  
Hearing Protection ◽  
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.

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