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A system for helium speech enhancement using the short-time Fourier transform

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1 Author(s)
Richards, M.A. ; Georgia Institute of Technology, Atlanta, Georgia

Helium speech is produced by speaking in a high-pressure helium-oxygen environment. A variety of acoustical and psychological effects render unprocessed helium speech virtually unintelligible. In this paper, a new system for enhancing helium speech based on the short-time Fourier transform (STFT) is described. The proposed system is able to correct many of the helium speech phenomena, does not require either pitch detection or a voiced/unvoiced decision, and is able to incorporate "spectral substraction" noise reduction algorithms in a natural way. Alternative methods for estimating the spectral envelope from the STFT and correcting its distortion are described, as well as a technique for reducing the signal sampling rate at the earliest possible stage.

Published in:

Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '81.  (Volume:6 )

Date of Conference:

Apr 1981