Binaural edge pitch

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Abstract
The Huggins pitch effect is created by dichotic broadband noise with interaural phase varying from 0 to 2.pi. over a narrow frequency region. The sensation of pitch, corresponding to the frequency of the phase shift region, is usually understood as the result of a binaural differencing operation. A pitch effect created by dichotic broadband noise is reported with interaural phase varying from 0 to .pi. over a narrow boundary region, creating an edge in a difference channel. This effect is called binaural edge pitch. For experienced listeners the effect is similar in nature and strength to the Huggins pitch. It is strongest for boundary frequencies in the 350-800 Hz range. Pitch matching experiments in this range find that the spread of matches is 1-2% of the boundary frequency and that the pitch is 4% higher or lower than the boundary frequency. This shift is identical to the shifts which are found for the pitch of high-pass and low-pass noise bands. The correspondence argues strongly for an explanation of the binaural edge pitch in terms of the Equalization-Cancellation Model of binaural processing, and pitch derived from a central spectrum.

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