A Progress Report on the Naval Aviators' Speech Discrimination Test PDF Download
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Author: James W. Greene
Publisher:
ISBN:
Category : Air pilots, Military
Languages : en
Pages : 16
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Book Description
Author: James W. Greene
Publisher:
ISBN:
Category : Air pilots, Military
Languages : en
Pages : 16
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Book Description
Author: James W. Greene
Publisher:
ISBN:
Category : Air pilots, Military
Languages : en
Pages : 7
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Book Description
Author: James W. Greene
Publisher:
ISBN:
Category : Audiometry
Languages : en
Pages : 40
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Book Description
The Naval Aviator's Speech Discrimination Test (NASDT), formulated in 1964, is used by the Bureau of Medicine and Surgery to evaluate aviators who fail to meet the hearing standards for aviation. The nature of the test, which involves a listening task for high-level speech signals with a simulated aircraft noise background, requires a tape recorder and earphone configuration. Two similar systems of test presentation have been developed and are in current use at 18 Navy and Marine Corps installations. The devices produce the properly controlled test signals required for the NASDT and are easily operated by trained corpsmen. Additional information is presented to enable the user of either system to administer the test properly.
Author: James W. Greene
Publisher:
ISBN:
Category : Audiometry
Languages : en
Pages : 28
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Book Description
The pure tone threshold audiogram required annually for naval aviators provides limited information toward determining their ability to understand speech in the aircraft. The Naval Aviator's Speech Discrimination Test (NASDT) was developed to evaluate objectively the ability to understand very loud speech in a background of aircraft noise for those aviators whose hearing failed to meet the standards. An earlier study had indicated that there was no relationship between the results of the NASDT and the configuration of the pure tone audiogram; therefore, to further examine this finding, data from pure tone threshold tests and the NASDT were obtained for over 500 men with different degrees of flight experience. Statistical analysis of the NASDT results showed that there was great consistency in scores made by the different groups. No practical correlations between NASDT scores and hearing threshold levels were found. Since the NASDT, therefore, appears to provide a more realistic evaluation of hearing in aircraft noise, it is suggested that it be employed as a supplementary test in the hearing evaluations of all aviators.
Author: James W. Greene
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: James W. Greene
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Naval Aerospace Medical Research Laboratory
Publisher:
ISBN:
Category :
Languages : en
Pages : 194
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Book Description
Author: Vernon C. Bragg
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
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Book Description
A new test was formulated for the purpose of evaluating the naval aviators' ability to interpret speech in a background of high-intensity noise such as that found in an aircraft cockpit. The test consists of one hundred one-syllable ords recorded in 100db of aircraft noise at a signal-to-noise ratio of plus 15 db. Twenty-four Service Group I and three Service Group III naval aviators between ages of forty and fifty were tested using two forms of the test. Mean scores showed no difference between groups, despite differences in threshold acuity for pure tones. Re-test revealed an unexpected improvement due to practice. Te test is proposed as a realistic method for use in determining the senior aviators' qualification to perform in Service Group I. AUTHOR).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 836
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Book Description
Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1252
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Book Description
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index.
