Accession Number : AD0726250

Title :   Speech in Helium: Theory and Measurements.

Descriptive Note : Final rept. 15 Jun 69-14 Jun 70,

Corporate Author : SANTA RITA TECHNOLOGY INC LOS ALTOS CALIF

Personal Author(s) : Stewart,John L.

Report Date : JAN 1971

Pagination or Media Count : 89

Abstract : The distortions of speech in a helium-breathing mixture are analyzed with the aid of an analog ear having time resolution sufficient to reveal temporal details of neural volleys as are produced by individual glottal pulses. The several existing techniques for helium speech correction are reviewed. Due to excessive weakening of second formants in helium concentrations greater than 80%, and certain other factors, it is concluded that no scheme yet proposed is likely to be satisfactory in a practical noisy environment. (Author)

Descriptors :   (*SPEECH, *HELIUM), (*SCUBA DIVERS, *SPEECH RECOGNITION), INTELLIGIBILITY, HEARING, SPEECH RECOGNITION, VOCODERS, NAVAL RESEARCH

Subject Categories : Voice Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE