Investigation of distortion of divers' speech using power spectral estimates based on the fast Fourier transform
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Authors
Bond, William Howard
Myatt, James Michael
Subjects
Advisors
Titus, Harold A.
Date of Issue
1969-06
Date
Publisher
Monterey, California. U.S. Naval Postgraduate School
Language
en_US
Abstract
The nroblem of distortion in underwater communications peculiar
to free divers and techniques for analysis of sneech wave forms are
discussed. The Fast Fourier Transform alqorithm, selected to analyze
shifts in formant frequencies due to restricted oral cavities, hinh
ambient pressures, and forced speech is discussed. The Fast Fourier
Transform is used to analyze a vowel sound and show that the expected
shifts do occur. Recommendations are made for extendi nq the techniques
to all non-noise like sounds and breathing mixtures other than compressed
air.
Type
Thesis
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Distribution Statement
Approved for public release; distribution is unlimited.