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Subjective Investigations of the Interaural Time Difference in the Horizontal Plane

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The Interaural Time Difference (ITD) is the primary cue for sound localisation. Although ITD has been intensively studied, there are still many issues to point at. This paper focuses on the ITD in relation with minimum phase filter modelling for the binaural synthesis. Comparison between ITD extraction methods highlights discrepancies for locations near the interaural axis. A subjective experiment was carried on to know the ITD to use with a given pair of minimun phase filters. Subjects had to adjust the ITD of a test sound in order to move it as close as possible to a target sound. Results are analysed in terms of psychoacoustic ITD estimations compared with extraction methods from Head Related Transfert Function (HRTF).

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