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