Demodulation Processes in Auditory Perception
Annual rept. 1 Jun 1993-31 May 1994
OHIO STATE UNIV COLUMBUS DEPT OF SPEECH AND HEARING SCIENCE
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The long range goal of this project is the understanding of human auditory processing of information conveyed by complex, time-varying signals such as speech, music or important environmental sounds. Our work is 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. psychoacoustics 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 the spectral picture. This approach leads to studies such as profile analysis and 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.
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