Abstract
Two divers made tape recordings of standard vocabularies while breathing several different helium-oxygen mixtures in a decompression chamber maintained at various simulated depths between sea level and 600 ft. Spectrographic analyses confirmed previous reports of nonlinear formant-frequency shifts and changes in relative formant amplitudes, but failed to reveal improvements with time in talker intelligibility, especially at the lowest depths. A mathematical model, incorporating both the effects of helium concentration and of depth, was found to account successfully for the observed changes in formant frequencies. The model has also been employed in a real-time speech correction device, the output of which represents a significant improvement in helium-speech intelligibility. [Work supported by Ocean Systems, Inc.]
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