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

Subject: Re: CASA problems and solutions
From:    "John K. Bates"  <jkbates(at)COMPUTER.NET>
Date:    Tue, 30 Jan 2001 18:14:34 -0500

John, Thank you for the comments on sound localization and reverberations. I'll check it out. My emphasis on direction of arrival was based on using it to test whether the interstitial waveform sampling idea has legs. It seems that it does. However, in my system localization is not really the first phase of the separation process, nor is it necessary for separation. The suggestion that separation occurs first is correct. In my sampling method, the waveform information vectors represent the first phase of separation because they contain the information by which source streams may be identified. I'm not sure how that fits in with the previous experiments, but it does make sense to me. Cheers, John Bates Time/Space Systems Pleasantville, New York At 11:12 AM 01/30/2001 GMT, you wrote: >John, > >While I wouldn't want to prejudge the usefulness of your approach as a >method for scene analysis by machines (I've heard some impressive >reverberation-suppression demos of Birger Kollmeier's), it seems >evident that humans do not use the cues in the way you describe. >Firstly, although human sound localisation works quite well in >reverberant environments, humans have great difficulty using >differences in source location to separate speech in reverberation >(Plomp, 1976; Culling et al., 1994; Darwin and Hukin, 2000). Second, >there is some reason to doubt that sound localisation is a pre-cursor >to sound separation (Culling and Summerfield, 1995; Hukin and Darwin, >1995). Darwin and Hukin (1999) have suggested that separation occurs >first, and that the processes of sound localisation are then applied >to already-separated auditory objects. > >John. > >Plomp, R (1976). Acustica, 34, 200-211. >Culling, JF, Summerfield, Q, and Marshall, DH (1994). Speech Comm. 14, 71-95. >Darwin, CJ and Hukin RW (2000) JASA, 108, 335-342. >Culling, JF and Summerfield, Q (1995) JASA 98, 785-797. >Hukin, RW, and Darwin, CJ (1995) JASA 98, 1380-1387. >Darwin, CJ and Hukin, RW (1999) JEP:HPP 25, 617-629. > >

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