Accession Number : AD0759413

Title :   The Speech Characteristics of Divers in HeO2 Breathing Mixtures at High Pressures.

Descriptive Note : Technical rept.,

Corporate Author : FLORIDA UNIV GAINESVILLE COMMUNICATION SCIENCES LAB

Personal Author(s) : Hollien,Harry ; Rothman,Howard B. ; Feinstein,Stephen H. ; Hollien,Patricia

Report Date : 01 FEB 1973

Pagination or Media Count : 13

Abstract : The development of saturation diving has enabled man to work in the sea for long periods of time--and at great depths. This situation has created problems in speech communication due to the effects of breathing HeO2 gas mixtures at high ambient pressures. The paper describes program of empirical research (conducted at depths ranging from 250 to 825 feet) used to investigate the effects of HeO2/P on speech. Specifically, a series of experiments is described that relate the distorting effects of the HeO2/P environment to: intelligibility levels, phonemic confusions, non-linearity of vowel format shifts, speech adaptation over time, and speech modification techniques to improve intelligibility. The research demonstrates that the intelligibility of a diver's speech under HeO2/P conditions improves over time, i.e., even unsystematic speaker adaptation to the environment occurs as a function of the length of time the diver remains in HeO2/P. Finally, it was found that divers can systematically manipulate their speech characteristics in order to be more intelligible in the HeO2/P milieu. (Author Modified Abstract)

Descriptors :   (*SPEECH, SCUBA DIVERS), (*VOICE COMMUNICATIONS, *INTELLIGIBILITY), UNDERWATER SOUND, HELIUM, PRESSURE, PHONETICS

Subject Categories : Voice Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE