Stereophonic Listening and Speech Intelligibility against Voice Babble

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Abstract
The utilization of a particular form of stereophonic information was studied with respect to the intelligibility of a single speech source heard in the presence of a voice babble of other speakers. The reception of monosyllabic words, presented against a babble of 1, 2, 4, or 7 talkers, was compared under two listening conditions: (1) In the stereophonic listening condition, one set of background talkers was presented to one earphone, another set of background talkers was presented to the other earphone, and the test words were presented binaurally, in phase; (2) In the control listening condition, only a single set of background talkers, and the test words, were presented to a single ear. The stereophonic advantage, for 50% word intelligibility, ranged from 12 db with 1 background voice per channel to 5.5 db with 7 background voices per channel.

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