AN INVESTIGATION INTO THE DIFFERENCES BETWEEN HRTFS IN A SPATIAL AUDIO DISPLAY SYSTEM FOR IMPROVING SPEECH INTELLIGIBILITY

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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 improvement of communication system performance through the use of natural binaural hearing simulation has recently been the focus of a number of research studies. These have suggested that a spatialized signal presentation can produce up to 6 dB of Signal to Noise Ratio (SNR) improvement over a diotic presentation (referring to the presentation of identical signals in both ears). The perception of binaural hearing also allows the listener to switch voluntarily between multiple channels of information which may be of particular benefit to aircraft communications personnel who are regularly required to monitor several communication channels at once. Previous research activities at DCIEM have investigated the improvement of speech intelligibility through the use of Spatial Audio Displays. Such displays are implemented through software processing algorithms termed Head Related Transfer Functions (HRTF). Currently, three such function sets are being used at DCIEM, and the results of a comparative performance evaluation is the subject of this report. The function sets studied were: the Focal Point 3D audio Type I system with proprietary HRTF, and the Tucker-Davis Technologies Power DAC system with HRTFs from Wightman, and Carlile and Pralong. The task involved the identification of a three-digit number spoken by a female voice over a headset in a diotic masking background of Speech Babble. TRUNCATED
Keywords
HRTF (Head Related Transfer Functions)
Report Number
DCIEM-96-CR-15 — Contractor Report
Date of publication
01 Oct 1996
Number of Pages
40
DSTKIM No
97-00646
CANDIS No
500885
Format(s):
Hardcopy;Document Image stored on Optical Disk

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