Abstract
Two sinusoidal carriers separated by frequency F were each sinusoidally amplitude modulated (AM). Subjects were asked to discriminate between a complex in which the two AM signals had the same phase and a complex in which the phase spectra of the lower frequency AM components were delayed relative to the upper frequency AM components. The threshold value of the phase shift was measured from three-point psychometric functions obtained from a two-alternative, forced-choice task. A broadband-noise background and random variation in overall level were used to force the two normal-hearing listeners to attend to the temporal structure of the two-tone AM complexes. The frequency separation between the two carriers (F), the rates of AM modulation, and the form of the phase shift (entire waveform or envelope delay) were parameters in the study. The results indicate that the threshold for detecting the phase shift is small when the two carriers are within a critical band. However, listeners are still quite sensitive to the phase shifts for very large frequency separations between the carriers. The results will be discussed in terms of the auditory system's ability to use temporal modulation to identify common sources in a complex sound. [Work supported by AFOSR-Life Sciences and the NINCDS.]
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