Evaluation of the SNAPSHOT 3D Head-Related Transfer Functions Measurement System

摘要

The SNAPSHOT MX is a system designed to collect individualized Head- Related Transfer Functions (HRTFS) quickly and efficiently in non-anechoic rooms. The system, which consists of a signal processing workstation, a speaker stand, and a pair of microphones that are inserted into the ears of the subject, uses Golay codes to measure the time-domain impulse response of the transfer function from the speaker to the in-ear microphones. The impulse responses are then windowed to eliminate the effects of room reverberation and stored in an acoustic head map (AHM) file for rendering with the Convolvotron virtual audio display. This report outlines the SNAPSHOT system and presents the results of a study comparing auditory localization performance with individualized HRTFs measured with the SNAPSHOT to generic HRThs measured with the SNAPSHOT on the Knowles Electronics Manikin for Acoustic Research (KEMAR) and to the genetic SDO transfer functions packaged with the Convolvotron. The results indicate that localization performance is significantly worse with the individualized SNAPSHOT HRThs than with the genetic SDO HRThs.