EQUIPMENT SETUP DOCUMENTATION FOR DIOTIC AND DIFFUSE-FIELD MASKER SPEECH DISCRIMINATION STUDY INCLUDING PILOT STUDY RESULTS

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Authors
  1. Welker, A.C.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);Welker Audio Consulting, Waterloo ONT (CAN)
Abstract
The Noise and Communications and the Display Systems groups at the Defence and Civil Institute of Environmental Medicine (DCIEM) have previously conducted a number of studies on improving speech intelligibility which have largely focused on investigating the impact of spatialization hardware/software and headset type on binaural signal detection performance. As DCIEM's mandate for the study of binaural signal processing centres around the possible aid or enhancement of signal detection within typical military environments, a positive-gavity (+Gz) physiological stressor was selected to investigate the practicality of using a binaural audio display system within this typical military environment. In the present study, subjects were exposed to sustained +3Gz while performing a binaural signal detection task. A pulsed white-noise signal was presented in 5 unique spatial positions using a Tucker-Davis Technologies Power DAC running a Russel Martin derived HRTF set while being masked by a filtered pink-noise masker. Subjects were required to depress a switch as long as the pulsed signal could be heard and release it when the signal was no longer audible. A modified Bekesy staircase routine was implemented to vary the signal-to-noise ratio and determine auditory threshold values. Training session within a sound-attenuating booth resulted in a maximum average improvement of 6.1dB at an azimuth position of 90 degrees. TRUNCATED
Keywords
Human Binaural Signal Detection Performance;Binaural Reproduction Hardware/Software;Head Related Transfer Function (HRTF) Validation;Spatial Auditory Display;Effect of Physiological Stress on Audition
Report Number
DCIEM-97-CR-35 — Contractor's Report (Final)
Date of publication
01 Oct 1997
Number of Pages
40
DSTKIM No
98-00301
CANDIS No
506963
Format(s):
Hardcopy;Document Image stored on Optical Disk

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