Noise and Speech Interference PDF Download
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Author: William Tracy Shepherd
Publisher:
ISBN:
Category : Noise pollution
Languages : en
Pages : 234
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Book Description
Author: William Tracy Shepherd
Publisher:
ISBN:
Category : Noise pollution
Languages : en
Pages : 234
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Book Description
Author:
Publisher:
ISBN:
Category : Air traffic control
Languages : en
Pages : 20
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Book Description
Author: Acoustical Society of America
Publisher:
ISBN:
Category : Noise
Languages : en
Pages : 6
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Book Description
Author: Karl S. Pearsons
Publisher:
ISBN:
Category : Acoustic measurement
Languages : en
Pages : 82
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Book Description
Author: American National Standards Institute
Publisher:
ISBN:
Category : Speech, Intelligibility of
Languages : en
Pages : 6
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: James David Miller
Publisher:
ISBN:
Category : Noise
Languages : en
Pages : 180
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Book Description
Author: Acoustical Society of America
Publisher:
ISBN:
Category : Noise
Languages : en
Pages : 7
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Book Description
Author: C. E. Williams
Publisher:
ISBN:
Category :
Languages : en
Pages : 79
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Book Description
For various aircraft flyovers, speech intelligibility scores and calculations of AI (Articulation Index) were obtained as functions of time. These data were then used to establish the relation between AI and intelligibility for time-varying noise. A similar relation was also obtained for steady-state simulated jet noise. A comparison of the two relations showed that for a given AI, the time-varying noise provided less masking than the steady-state noise. The difference found between the two relations cautions against the use of relations established for steady-state noise to predict intelligibility scores that might be obtained with time-varying noise. The aircraft flyovers employed in the intelligibility tests were also presented to listeners who were asked to rate them in terms of their acceptability in the home. Using a rating scale having the categories 'of no concern, ' 'acceptable, ' 'barely acceptable, ' and 'unacceptable, ' judgments were obtained in three listening situations: (1) in the presence of radio-TV speech; (2) in the absence of speech; and (3) in the presence of telephone speech. (Author).
Author: Donald C. Gasaway
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
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Book Description
Acoustic noise within aircraft during flight often causes some degree of interference with aural communication. Several methods have been used over the years to identify and predict degrees of speech interference. Six of these methods are discussed: four involve octave-band averaging; two use frequency weighting. The assessment is based on application of each of the six indices to noise levels measured within the cockpits of 191 fixed-wing and 58 rotary-wing aircraft, grouped into 11 categories by engine type. Equivalent speech interference levels obtained from the use of each of the six indices are provided for the acoustic spectra developed for the 11 classes of vehicles. The operational considerations which influence speech interference values are described. Noise attenuation provided by headset devices commonly used by Air Force aircrew members is shown for different groups of noise spectra. Criteria are given for evaluating protected and unprotected exposures to noise that compromise communications. (Author).
