Document Detail

Hypoxia-induced fatal aircraft accident revealed by voice analysis.
MedLine Citation:
PMID:  7369978     Owner:  NLM     Status:  MEDLINE    
The voice communication was the only clue of the fatal F-104J accident encountered during high-altitude intercept procedures, and it was analysed to prove the presence of hypoxia as a causal factor. A simulated low-pressure chamber flight was undertaken, and the subject's voice, saying the same words as the pilot, was analyzed in the same way. Comparison of these two voices revealed a similarity in characteristic changes of the sound spectrum and time course. The blurred formation of formant, fundamental, and harmonic frequencies, as well as the obscured gap in pre-vocal cord opening time (VOT) of the sound spectrogram, were thought to be the effects of hypoxia. Lowered fundamental frequency of the pilot's voice, even at the stressful period of attack, has strongly suggested decreased vigilance due to hypoxia. Through these findings, it was concluded that the cause of the accident was probably hypoxia in the pilot.
I Saito; O Fujiwara; N Utsuki; C Mizumoto; T Arimori
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Aviation, space, and environmental medicine     Volume:  51     ISSN:  0095-6562     ISO Abbreviation:  Aviat Space Environ Med     Publication Date:  1980 Apr 
Date Detail:
Created Date:  1980-06-25     Completed Date:  1980-06-25     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7501714     Medline TA:  Aviat Space Environ Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  402-6     Citation Subset:  IM; S    
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MeSH Terms
Accidents, Aviation*
Anoxia / complications*,  diagnosis
Oxygen Consumption
Reaction Time
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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