Accession Number : AD0707729

Title :   INVESTIGATION OF DISTORTION OF DIVERS' SPEECH USING POWER SPECTRAL ESTIMATES BASED ON THE FAST FOURIER TRANSFORM.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Bond,William Howard ; Myatt,James Michael

Report Date : JUN 1969

Pagination or Media Count : 93

Abstract : The problem of distortion in underwater communications peculiar to free divers and techniques for analysis of speech wave forms are discussed. The fast Fourier transform algorithm, selected to analyze shifts in formant frequencies due to restricted oral cavities, high 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 extending the techniques to all non-noise like sounds and breathing mixtures other than compressed air. (Author)

Descriptors :   (*DIVING, SPEECH), (*SPEECH, DISTORTION), UNDERWATER EQUIPMENT, PHYSIOLOGY, CONTROLLED ATMOSPHERES, PRESSURIZATION, INTELLIGIBILITY, PERFORMANCE(HUMAN), FOURIER ANALYSIS, UNDERWATER SOUND, SPECTRUM SIGNATURES, HUMAN FACTORS ENGINEERING, THESES

Subject Categories : Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE