Time Axis Analysis of Gravity Distorted Speech.

Abstract

An algorithm to determine energy shift along the time axis was applied to digitized speech data, which had been recorded at six different gravity levels. The analog speech was recorded during the centrifuge tests at the Air Force Medical Research Lab, Wright-Patterson AFB, Ohio. The data was then digitized, Fourier Transformed, high frequency preemphasized, channel compressed, and energy-normalized. The processed files were checked for time duration of each word in both the time and frequency domain. Large time-duration differences--up to 200 msecs--were recorded; but there was no statistical mapping pattern of distortion versus gravity level. Time distortion of the speech energy within a given gravity level was as significant as the distortion between gravity levels. The results indicate that no additional time warping considerations will need to be made within the speech recognition algorithms to compensate for gravity fluctuations. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1981
Accession Number
ADA115540

Entities

People

  • J. Calvin Hunter

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Biomedical
  • C4I
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Air Pressure
  • Automated Speech Recognition
  • Converters
  • Data Acquisition
  • Data Reduction
  • Data Sets
  • Electrical Engineering
  • Engineering
  • Feature Extraction
  • Frequency
  • Frequency Shift
  • Identification
  • Larynx
  • Plastic Explosives
  • Recognition
  • Signal Processing

Readers

  • Geodesy
  • Plasma Physics / Magnetohydrodynamics
  • Speech Processing/Speech Recognition.

Technology Areas

  • AI & ML