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Sound Source Signal Parameters in Vehicles for Determining Speech Transmission Index

In the acoustically complex environment of an automobile, speech communications among the vehicle occupants varies from unintelligible to excellent depending on their location, vehicle speed, and vocal effort. Because of its strong correlation with subjective tests, the speech transmission index (STI) was used to explore the influence of sound source parameters on in-vehicle intelligibility. For example, STI scores were higher when there was a direct path from the talker to the listener; scores were much lower when the talker was in front of the listener; and scores were lower for the outboard ear because of road noise.

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JAES Volume 59 Issue 10 pp. 735-744; October 2011
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AES - Audio Engineering Society