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

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)

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1969
Accession Number
AD0707729

Entities

People

  • James Michael Myatt
  • William Howard Bond

Organizations

  • Naval Postgraduate School

Tags

DTIC Thesaurus Topics

  • Air
  • Algorithms
  • Compressed Air
  • Distortion
  • Fast Fourier Transforms
  • Frequency
  • Frequency Shift
  • Respiration
  • Underwater Communications
  • Waveforms
  • Waves

Fields of Study

  • Engineering

Readers

  • Image Processing and Computer Vision.
  • Speech Processing/Speech Recognition.
  • Underwater engineering and Marine Technology.