Abstract
Helmholtz reported that the pitch of a two component complex tone could be shifted by slightly increasing the amplitude of one component. The pitch was shifted toward the frequency of the more intense component. Helmholtz attributed the pitch shift to a variation in the instantaneous frequency of the two tone complex. This laboratory has previously investigated the discriminability of pairs of two component complex tones with identical small amplitude differences between the components of a pair. Discriminability seemed to depend upon the difference in their envelope-weighted instantaneous frequency fluctuations. In the study to be reported, we have asked listeners to match a two component, nonfluctuating complex tone to each member of pairs of the two component complex tones described above. The differences in pitch so obtained will be compared with the differences in envelope-weighted instantaneous frequency fluctuations to relate the pitch of each fluctuating two tone complex to its averaged instantaneous frequency. [Work supported by a grant from the National Institutes of Health.]
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