Re: Granular synthesis and auditory segmentation (Didier A Depireux )

Subject: Re: Granular synthesis and auditory segmentation
From:    Didier A Depireux  <didier(at)ISR.UMD.EDU>
Date:    Wed, 14 Oct 1998 11:43:59 -0400

On Wed, 14 Oct 1998, Richard J. Fabbri wrote: > We can let Nature teach us a new path ... or, we can persist and > continue applying a transform simply because a mathematical theory > of such transforms makes analysis "simple" ... simple but, offers no > truth (in fact) to the basic sense of hearing. So if I take a 1000 Hz pure sinusoid, and I half-wave rectify it, it doesn't make a difference? You might want to try it yourself first. The pattern of activity on the basilar membrane will be quite different, depending on whether you present a pure sinusoid or its half-wave rectified version. It's simply because the frequency content of the stimulus is different. The inner ear does do a sort of Fourier analysis on the whole waveform. The half-wave rectification occurs _after_ the frequency decomposition performed on the basilar membrane, i.e. after you have decomposed the signal into frequency channels. Didier -- Didier A Depireux didier(at) Neural Systems Lab Institute for Systems Research Phone: 301-405-6557 (off) University of Maryland -6596 (lab) College Park MD 20742 USA Fax: 1-301-314-9920 Email to AUDITORY should now be sent to AUDITORY(at) LISTSERV commands should be sent to listserv(at) Information is available on the WEB at

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