Download or read book Six Indices for Predicting Speech Interference Within Aircraft written by Donald C. Gasaway and published by . This book was released on 1970 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Download or read book SAM TR written by and published by . This book was released on 1971 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 1028 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book Report USAF School of Aerospace Medicine 65 90 1970 written by and published by . This book was released on 1970 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book SAM TR written by and published by . This book was released on 1970-12 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report USAF School of Aerospace Medicine 34 49 1971 written by and published by . This book was released on 1971 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Documentary Report SAM TDR written by USAF School of Aerospace Medicine and published by . This book was released on 1971 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Reference Publication written by and published by . This book was released on 1977 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Otolaryngology written by and published by . This book was released on 1990 with total page 1186 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliographic List Library Branch Administrative Services Division Office of Management Services written by and published by . This book was released on 1962 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Index written by and published by . This book was released on 1971 with total page 942 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Environmental Pollution written by and published by . This book was released on 1971 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1980 with total page 1388 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analysis of Community and Airport Relationships noise Abatement written by and published by . This book was released on 1964 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Some Factors Influencing Human Response to Aircraft Noise Masking of Speech and Variability of Subjective Judgments written by K. D. Kryter and published by . This book was released on 1965 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Statistics of the variability of subjective judgments of the loudness and noisiness of pure tones and complex sounds as studied in the laboratory and in the field are presented. An analysis of possible sources or causes of this variability is made in terms of test-retest reliability, differences among subjects, type of sounds judged and experimental method used in obtaining judgments. Possible contributions to variability of judgments due to differences in the size of the external ear and the thresholds of auditory sensitivity at different sound frequencies for different age groups are discussed. Word intelligibility tests at various intensity levels were administered to a crew of trained listeners in the presence of recorded noise from jet and propeller-driven aircraft. The noise was that which would be present outdoors and in a house as the result of engine run-up operations and when the aircraft were flying overhead shortly after take-off and prior to landing. Methods of measuring or evaluating aircraft noise predict the results of the speech tests in the following order of merit, from best to worse: (1) Articulation Index (AI); (2) and (3) perceived noise level in PNdB and Speech Interference Level (SIL) (SIL and PNdB appear to predict the masking of speech about equally well); (4) Noise Criteria (NC); (5) overall SPL, A scale; and (6) overall sound pressure level, C scale. (Author).

Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1971 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt: