Speech intelligibility was evaluated using a virtual acoustic (3-D audio) display and the method specified by ANSI (S3.2-1989). Ten subjects were evaluated with stimuli either unfiltered or low-pass filtered at 4 kHz. Results show virtual acoustic techniques are advantageous for both full-bandwidth (44.1-kHz rate) and low-bandwidth (8-kHz rate) telephone-grade teleconferencing systems.
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