Accession Number:

ADA207131

Title:

Demodulation Processes in Auditory Perception

Descriptive Note:

Final rept. 1 Dec 1987-30 Nov 1988, annual rept. 1 Dec 1987-30 Nov 1988

Corporate Author:

KANSAS UNIV LAWRENCE

Personal Author(s):

Report Date:

1989-01-03

Pagination or Media Count:

29.0

Abstract:

The overall goal of this project is to understand the ability of the human listener to extract information from complex, time-varying sounds such as speech, music or other environmentally important signals. Specifically, we are interested in the listeners ability to process modulations of frequency and amplitude which are thought to carry the information in such signals. To that end we have devised a signal-processing model that calculates the Envelope-Weighted Average of the Instantaneous Frequency EWAIF for complex, time-varying signals. We initiated a series of experiments to test the performance of the new EWAIF model. Listeners were asked to discriminate between two frequency modulated tones. Testing of normal listeners in the frequency glide vs multiple-step transition task has indicated that the normal ear has a temporal window of approximately 7 to 10 msec. Further, these results appear to indicate that the critical band, thought to be ubiquitous in peripheral processing, has no effect on the listeners discriminations of sub-critical, critical or supra-critical bandwidth swept frequency signals.

Subject Categories:

  • Psychology
  • Anatomy and Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE