Noise And Speech Interference

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Noise And Speech Interference

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Author : William Tracy Shepherd
language : en
Publisher:
Release Date : 1975

Noise And Speech Interference written by William Tracy Shepherd and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Noise pollution categories.

Cockpit Noise And Speech Interference Between Crewmembers

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Author :
language : en
Publisher:
Release Date : 1989

Cockpit Noise And Speech Interference Between Crewmembers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Air traffic control categories.

Noise And Speech Interference Proceedings Of A Minisymposium Nasa

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Author :
language : en
Publisher:
Release Date :

Noise And Speech Interference Proceedings Of A Minisymposium Nasa written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.

For Rating Noise With Respect To Speech Interference

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Author : Acoustical Society of America
language : en
Publisher:
Release Date : 1977

For Rating Noise With Respect To Speech Interference written by Acoustical Society of America and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Noise categories.

The Speech Interference Effects Of Aircraft Noise

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Author : C. E. Williams
language : en
Publisher:
Release Date : 1967

The Speech Interference Effects Of Aircraft Noise written by C. E. Williams and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with categories.

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).

Speech Levels In Various Noise Environments

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Author : Karl S. Pearsons
language : en
Publisher:
Release Date : 1977

Speech Levels In Various Noise Environments written by Karl S. Pearsons and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Acoustic measurement categories.

Six Indices For Predicting Speech Interference Within Aircraft

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Author : Donald C. Gasaway
language : en
Publisher:
Release Date : 1970

Six Indices For Predicting Speech Interference Within Aircraft written by Donald C. Gasaway and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with categories.

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).

American National Standard For Rating Noise With Respect To Speech Interference

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Author : American National Standards Institute
language : en
Publisher:
Release Date : 1977

American National Standard For Rating Noise With Respect To Speech Interference written by American National Standards Institute and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Speech, Intelligibility of categories.

The Effects Of Noise On Speech And Warning Signals

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Author : Alice Harriet Suter
language : en
Publisher:
Release Date : 1989

The Effects Of Noise On Speech And Warning Signals written by Alice Harriet Suter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Auditory perception categories.

To assess the effects of noise on speech communication it is necessary to examine certain characteristics of the speech signal. Speech level can be measured by a variety of methods, none of which has yet been standardized, and it should be kept in mind that vocal effort increases with background noise level and with different types of activity. Noise and filtering commonly degrade the speech signal, especially as it is transmitted through communications systems. Intelligibility is also adversely affected by distance, reverberation, and monaural listening. Communication systems currently in use may cause strain and delays on the part of the listener, but there are many possibilities for improvement. Individuals who need to communicate in noise may be subject to voice disorders. Shouted speech becomes progressively less intelligible at high voice levels, but improvements can be realized when talkers use 'clear speech.' Tolerable listening levels are lower for negative than for positive S/Ns, and comfortable listening levels should be at a S/N of at least 5 dB, and preferably above 10 dB. Popular methods to predict speech intelligibility in noise include the Articulation Index, Speech Interference Level, Speech Transmission Index, and the sound level meter's A-weighting network. This report describes these methods, discussing certain advantages and disadvantages of each, and shows their interrelations.

American National Standard For Rating Noise With Respect To Speech Interference

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Author : Acoustical Society of America
language : en
Publisher:
Release Date : 2006

American National Standard For Rating Noise With Respect To Speech Interference written by Acoustical Society of America and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Noise categories.