Listeners were required to identify which of six vowel-like harmonic complexes was presented on each trial. The components of the complexes were added either in cosine or in random phase and the fundamental frequency was 50 or 100 Hz. The sounds were reproduced in a typical listening room via a distributed mode loudspeaker (DML) or a conventional loudspeaker. Overall accuracy of vowel identification was similar for the two loudspeakers. For both loudspeakers, performance was better for cosine phase than for random phase, indicating that phase information is preserved to some extent even in the far field.
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