Interaural Phase and Level Fluctuations as the Basis of Interaural Incoherence Detection
Interaural coherence is a measure of the similarity of signals in a listener’s two ears. It is derived from the interaural cross-correlation function, which is a function of the interaural lag. The peak of the cross-correlation function is of particular interest. The value of the lag for which the peak occurs is regarded as the relevant interaural time difference (ITD) cue for the location of the sound image. This value of lag was given a place representation in the famous binaural model by Jeffress (1948). The height of the peak is thought to determine the compactness of the image. If the sounds in the two ears are identical except for an interaural delay, then the peak height has its maximum value of 1, and the image is expected to be maximally compact. If the height of the peak is less than 1, the image is broader or more diffuse (Barron 1983; Blauert and Lindemann 1986).
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