Accession Number : AD0702119

Title :   HELIUM SPEECH INVESTIGATIONS.

Descriptive Note : Final technical rept. Mar 68-Nov 69,

Corporate Author : SINGER-GENERAL PRECISION INC PLEASANTVILLE N Y KEARFOTT DIV

Personal Author(s) : Flower,Robert A.

Report Date : 10 DEC 1969

Pagination or Media Count : 71

Abstract : The essential steps for correction of helium speech distortions are: providing bandwidth to 10 KHz, providing adequate compensation for loss of vocal output in the 2-8 KHz range, and reducing spectral envelope frequencies (e.g., the formant bands) to normal values while preserving the glottal rate of the talker. A helium speech translator based on these principles has been developed and tested. Both taped stimuli and real-time operation during dives were used for evaluation purposes. Highly successful performance was demonstrated with divers at pressure depths as great as 1000 feet. Objective word intelligibility test results were 88% at 500 feet and 78 at 800 feet, as compared with previously reported intelligibility of 5% for uncorrected helium speech at a depth of 600 feet. (Author)

Descriptors :   (*HELIUM, SPEECH TRANSMISSION), (*UNDERWATER COMMUNICATION SYSTEMS, EFFECTIVENESS), SPEECH RECOGNITION, CORRECTIONS, MACHINE TRANSLATION, DESIGN, FREQUENCY CONVERTERS, TABLES(DATA)

Subject Categories : Voice Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE