Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781729434420
Category : Science
Languages : en
Pages : 46
Book Description
Active Noise Reduction (ANR) is a new technology which can reduce the level of aircraft cockpit noise that reaches the pilot's ear while simultaneously improving the signal to noise ratio for voice communications and other information bearing sound signals in the cockpit. A miniature, ear-cup mounted ANR system was tested to determine whether speech intelligibility is better for helicopter pilots using ANR compared to a control condition of ANR turned off. Two signal to noise ratios (S/N), representative of actual cockpit conditions, were used for the ratio of the speech to cockpit noise sound pressure levels. Speech intelligibility was significantly better with ANR compared to no ANR for both S/N conditions. Variability of speech intelligibility among pilots was also significantly less with ANR. When the stock helmet was used with ANR turned off, the average PB Word speech intelligibility score was below the Normally Acceptable level. In comparison, it was above that level with ANR on in both S/N levels. Chan, Jeffrey W. and Simpson, Carol A. Unspecified Center NAS2-12425; NAS2-13188; RTOP 505-61-51...
Comparison of Speech Intelligibility in Cockpit Noise Using Sph-4 Flight Helmet with and Without Active Noise Reduction
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781729434420
Category : Science
Languages : en
Pages : 46
Book Description
Active Noise Reduction (ANR) is a new technology which can reduce the level of aircraft cockpit noise that reaches the pilot's ear while simultaneously improving the signal to noise ratio for voice communications and other information bearing sound signals in the cockpit. A miniature, ear-cup mounted ANR system was tested to determine whether speech intelligibility is better for helicopter pilots using ANR compared to a control condition of ANR turned off. Two signal to noise ratios (S/N), representative of actual cockpit conditions, were used for the ratio of the speech to cockpit noise sound pressure levels. Speech intelligibility was significantly better with ANR compared to no ANR for both S/N conditions. Variability of speech intelligibility among pilots was also significantly less with ANR. When the stock helmet was used with ANR turned off, the average PB Word speech intelligibility score was below the Normally Acceptable level. In comparison, it was above that level with ANR on in both S/N levels. Chan, Jeffrey W. and Simpson, Carol A. Unspecified Center NAS2-12425; NAS2-13188; RTOP 505-61-51...
Publisher: Independently Published
ISBN: 9781729434420
Category : Science
Languages : en
Pages : 46
Book Description
Active Noise Reduction (ANR) is a new technology which can reduce the level of aircraft cockpit noise that reaches the pilot's ear while simultaneously improving the signal to noise ratio for voice communications and other information bearing sound signals in the cockpit. A miniature, ear-cup mounted ANR system was tested to determine whether speech intelligibility is better for helicopter pilots using ANR compared to a control condition of ANR turned off. Two signal to noise ratios (S/N), representative of actual cockpit conditions, were used for the ratio of the speech to cockpit noise sound pressure levels. Speech intelligibility was significantly better with ANR compared to no ANR for both S/N conditions. Variability of speech intelligibility among pilots was also significantly less with ANR. When the stock helmet was used with ANR turned off, the average PB Word speech intelligibility score was below the Normally Acceptable level. In comparison, it was above that level with ANR on in both S/N levels. Chan, Jeffrey W. and Simpson, Carol A. Unspecified Center NAS2-12425; NAS2-13188; RTOP 505-61-51...
Comparison of Speech Intelligibility in Cockpit Noise Using SPH-4 Flight Helmet with and Without Active Noise Reduction
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 44
Book Description
Active Noise Reduction (ANR) is a new technology which can reduce the level of aircraft cockpit noise that reaches the pilot's ear while simultaneously improving the signal-to-noise ratio for voice communications and other information-bearing sound signals in the cockpit. A miniature, ear-cup mounted ANR system, developed by Royal Aerospace Establishment, Farnborough, United Kingdom, was tested by U.S. Army Aeroflightdynamics Directorate, Simulation and Aircraft Systems Division, Crew Station Research and Development Branch to determine whether speech intelligibility is better for helicopter pilots using ANR compared to a control condition of ANR turned off. The ANR system was installed in a stock Army SPH-4 flight helmet, and tested in a background of recorded AH-1S (Cobra) cockpit noise, using phonetically balanced word lists, per MIL-STD-1472C. Two signal-to-noise ratios (S/N), representative of actual cockpit conditions, were used: 0 dB and +10 dB for the ratio of the speech to cockpit noise sound pressure levels. Speech intelligibility was significantly better with ANR compared to no ANR for both S/N conditions. Variability of speech intelligibility among pilots was also significantly less with ANR. When the stock helmet was used with ANR turned off, the average PB word speech intelligibility score was below the Normally Acceptable level, per MIl-STD-1472C in the 0 dB S/N levels and exceeded the Exceptionally High Intelligibility level with S/N +10 dB. Keywords: Cockpit communications, Active noise reduction.
Publisher:
ISBN:
Category :
Languages : en
Pages : 44
Book Description
Active Noise Reduction (ANR) is a new technology which can reduce the level of aircraft cockpit noise that reaches the pilot's ear while simultaneously improving the signal-to-noise ratio for voice communications and other information-bearing sound signals in the cockpit. A miniature, ear-cup mounted ANR system, developed by Royal Aerospace Establishment, Farnborough, United Kingdom, was tested by U.S. Army Aeroflightdynamics Directorate, Simulation and Aircraft Systems Division, Crew Station Research and Development Branch to determine whether speech intelligibility is better for helicopter pilots using ANR compared to a control condition of ANR turned off. The ANR system was installed in a stock Army SPH-4 flight helmet, and tested in a background of recorded AH-1S (Cobra) cockpit noise, using phonetically balanced word lists, per MIL-STD-1472C. Two signal-to-noise ratios (S/N), representative of actual cockpit conditions, were used: 0 dB and +10 dB for the ratio of the speech to cockpit noise sound pressure levels. Speech intelligibility was significantly better with ANR compared to no ANR for both S/N conditions. Variability of speech intelligibility among pilots was also significantly less with ANR. When the stock helmet was used with ANR turned off, the average PB word speech intelligibility score was below the Normally Acceptable level, per MIl-STD-1472C in the 0 dB S/N levels and exceeded the Exceptionally High Intelligibility level with S/N +10 dB. Keywords: Cockpit communications, Active noise reduction.
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1036
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1036
Book Description
Advances In Industrial Ergonomics And Safety V
Author: R Nielson
Publisher: CRC Press
ISBN: 0203221478
Category : Technology & Engineering
Languages : en
Pages : 1009
Book Description
Each year public awareness of the importance of ergonomics for improving people's working conditions and home environment increases, as the application of ergonomics brings more and more tangible benefits to society at large. The Annual International Industrial Ergonomics and Safety Conference held in Copenhagen, Denmark in June 1993, sponsored by the International Foundation for Industrial Ergonomics and Safety Research brought together more than 200 ergonomic professionals from North America, Europe and Asia to present over 120 research papers, in a quest to share their knowledge of new developments in design for people and improving safety at work.; This volume is a reference on the variety of problems that industrial and office workers face today, and moreover, offers solutions in the drive towards the safe workplace.
Publisher: CRC Press
ISBN: 0203221478
Category : Technology & Engineering
Languages : en
Pages : 1009
Book Description
Each year public awareness of the importance of ergonomics for improving people's working conditions and home environment increases, as the application of ergonomics brings more and more tangible benefits to society at large. The Annual International Industrial Ergonomics and Safety Conference held in Copenhagen, Denmark in June 1993, sponsored by the International Foundation for Industrial Ergonomics and Safety Research brought together more than 200 ergonomic professionals from North America, Europe and Asia to present over 120 research papers, in a quest to share their knowledge of new developments in design for people and improving safety at work.; This volume is a reference on the variety of problems that industrial and office workers face today, and moreover, offers solutions in the drive towards the safe workplace.
Aeronautical Engineering
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 568
Book Description
A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 568
Book Description
A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
Monthly Catalog of United States Government Publications
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages :
Book Description
Monthly Catalogue, United States Public Documents
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1284
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1284
Book Description
NASA SP.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 580
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 580
Book Description
Government reports annual index
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 1182
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 1182
Book Description
Government Reports Announcements & Index
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1388
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1388
Book Description