Subject: Re: Granular synthesis and auditory segmentation From: Pierre Divenyi <pdivenyi(at)MARVA4.NCSC.MED.VA.GOV> Date: Wed, 14 Oct 1998 10:54:39 -0700--=====================_75270546==_.ALT Content-Type: text/plain; charset="us-ascii" > 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, I am afraid you misunderstood the argument. But I let John Bates and Richard Fabbri correct the matter. 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)marva4.ebire.org **************************************************************************** --=====================_75270546==_.ALT Content-Type: text/html; charset="us-ascii" <html><br> <div>> So if I take a 1000 Hz pure sinusoid, and I half-wave rectify it,</div> <div>>it doesn't make a difference? You might want to try it yourself first.</div> <div>> The pattern of activity on the basilar membrane will be quite</div> <div>>different, depending on whether you present a pure sinusoid or its</div> <div>>half-wave rectified version. It's simply because the frequency content of</div> <div>>the stimulus is different. The inner ear does do a sort of Fourier analysis</div> <div>>on the whole waveform.</div> <div>> The half-wave rectification occurs _after_ the frequency</div> <div>>decomposition performed on the basilar membrane, i.e. after you have</div> <div>>decomposed the signal into frequency channels.</div> <div>></div> <div>> Didier</div> <div>></div> <div>Didier,</div> <br> <div>I am afraid you misunderstood the argument. But I let John Bates and Richard Fabbri correct the matter.</div> <br> <x-tab> </x-tab>Pierre <br> <br> ****************************************************************************<br> Pierre Divenyi<x-tab> </x-tab> <x-tab> </x-tab> Experimental Audiology Research (151)<br> V.A. Medical Center, Martinez, CA 94553, USA<br> Phone: (925) 370-6745 <br> Fax: (925) 228-5738<br> E-mail : <x-tab> </x-tab> <font color="#0000FF"><u>pdivenyi(at)marva4.ebire.org<br> </font></u><font color="#000000">****************************************************************************<br> </font></html> --=====================_75270546==_.ALT-- Email to AUDITORY should now be sent to AUDITORY(at)lists.mcgill.ca LISTSERV commands should be sent to listserv(at)lists.mcgill.ca Information is available on the WEB at http://www.mcgill.ca/cc/listserv