Re: Upside down noise (Pierre Divenyi )

Subject: Re: Upside down noise
From:    Pierre Divenyi  <pdivenyi(at)MARVA4.NCSC.MED.VA.GOV>
Date:    Thu, 6 Aug 1998 10:57:52 -0700

Personally, I don't find John Bates's question "noisy." Actually, Fred did not answer the question -- I think that Fred's explanation "creating some sort of spatial effect" is too vague and off-the-cuff. The effect is predictable as one maps interaural phase difference into interaural time difference, but nonetheless cute (setting it up took exactly 30 seconds of my time and another 30 seconds to listen): the perceived locus shifts from right to left and back, as the frequency sweeps up and down. However, depending on how low the frequency goes, the locus traverses ambiguous regions as well. I have a different question: Von Hornbostel is credited with describing the following situation: a bird singing (presumably sinusoidally) on a branch is perceived as if it were flying from right to left as the frequency of its song varies (presumably not too fast). Provided v. H. is right, how could that phenomenon be explained? I presume there were no reflecting surfaces near the bird. Pierre **************************************************************************** Pierre Divenyi Experimental Audiology Research (151) V.A. Medical Center, Martinez, CA 94553, USA Phone: (925) 370-6745; Fax: (925) 228-5738 E-mail : PDivenyi(at) **************************************************************************** McGill is running a new version of LISTSERV (1.8c on Windows NT). Information is available on the WEB at

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