CASA problems and solutions ("John K. Bates" )

Subject: CASA problems and solutions
From:    "John K. Bates"  <jkbates(at)COMPUTER.NET>
Date:    Mon, 29 Jan 2001 13:46:22 -0500

Dear List, You may have noticed that contributions on CASA have dropped to near zero after the enthusiasm of the early 1990s. A few people have suggested that it is time for some serious soul searching on ways to get back on track. To address this issue, I offer an essay on problems and solutions in computational auditory scene analysis at my Web site: <> This essay is intended to be the first section of a longer paper Abstract: In terms of practical results, we must conclude that current CASA research has been unproductive. I suggest that there has been no systematic analysis of the basic requirements for how the auditory system has evolved in the natural environment. Because of this failure the traditional research paradigm has ignored fundamental requirements for successfully operating a _computational_ system in an acoustic scene of many sound sources. After analyzing the requirements for separating sounds, I describe a method for high-resolution temporal analysis. The system uses a time-domain method I call interstitial waveform sampling. The objective is to obtain extremely fine time resolution while retaining information that allows intermixed sound sources to be separated into streams from which meaningful content may be extracted. A few preliminary experiments are shown here to illustrate the principles of interstitial processing: (1) obtaining real-time direction of arrival of the sounds of moving sources in a noisy, outdoor acoustic environment, and (2) using direction of arrival to separate acoustic sources in a reverberant office environment. Best regards, John Bates Time/Space Systems Pleasantville, New York

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