The pattern-transformation model of pitch.

A new approach to pitch perception is outlined in this paper. It is based on what might be called auditory pattern recognition. The general approach is formalized in a mathematical model, the so‐called “pattern‐transformation model.” In this model an acoustic stimulus is first transformed by the sense organ into a pattern of peripheral neural activity. This peripheral pattern is assumed roughly to represent the power‐spectrum of the stimulus. Thus, the temporal fine structure of the stimulus is virtually ignored; the model is phase insensitive. The peripheral pattern is then assumed to be Fourier transformed into another pattern of activity. This second pattern roughly represents the autocorrelation function of the stimulus. Pitch is derived from the positions of maximal activity in this pattern. From preliminary tests it appears that the model can successfully predict the pitch of many types of complex stimuli. In addition, the model provides estimates of pitch “strength” or “clarity.” These estimates al...