ASA 124th Meeting New Orleans 1992 October

1aPP8. Minimum audible angles for synthesized localization cues presented over headphones.

Richard L. McKinley

Mark Ericson

AL/CFBA, Wright--Patterson AFB, OH 45433-6573

David Perrot

Cal. State Univ., Los Angeles, CA

Robert Gilkey

Douglas Brungart

Wright State Univ., Dayton, OH

Frederic Wightman

Univ. of Wisconsin, Madison, WI

Several methods can be used to synthetically generate auditory localization cues over headphones. Very little traditional auditory performance data have been presented for these types of synthesizers. The data were collected using stimuli similar to those used by Mills [J. Acoust. Soc. Am. 30, 237--246 (1958)]: 500-Hz tone, 1 s on, 1 s off, 1 s on, 70-ms ramps for on period, and 500 ms off after response before the next stimulus was presented. The paradigm used was the two-source two-interval experiment described by Hartmann and Rakerd [J. Acoust. Soc. Am. 85, 2031--2041 (1985)]. The minimum audible angle (MAA) was measured at seven locations in the horizontal plane for synthetic stimuli presented over headphones. MAA data will be presented for 10 normal hearing subjects for each of the seven locations. The MAA data using headphones will be compared with free-field MAA data from the literature and with mean localization error data using headphones.