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Demodulation Processes in Auditory Perception.
Final rept. 1 Jun 93-31 Dec 96,
OHIO STATE UNIV COLUMBUS DEPT OF SPEECH AND HEARING SCIENCE
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The long range goal of this project was the understanding of human auditory processing of information conveyed by complex, time varying signals such as speech, music or important environmental sounds. Our work was guided by the assumption that human auditory communication is a modulation - demodulation process. That is, we assume that sound sources produce a complex stream of sound pressure waves with information encoded as variations modulations of the signal amplitude and frequency. The listeners task then is one of demodulation. Much of past psychoacoustic work has been based in what we characterize as spectrum picture processing. Complex sounds are Fourier analyzed to produce an amplitude by frequency picture and the perception process is modeled as if the listener were analyzing that spectral picture. This approach leads to studies such as profile analysis and to the power spectrum model of masking. Our approach leads us to investigate time varying, complex sounds. We refer to them as dynamic signals and we have developed auditory signal processing models to help guide our experimental work.
APPROVED FOR PUBLIC RELEASE