Subject:Re: Can a timbre affected by a shifted virtual pitch evoked byFrom:Eckard Blumschein <Eckard.Blumschein(at)E-TECHNIK.UNI-MAGDEBURG.DE>Date:Tue, 25 Feb 2003 08:20:46 +0100At 15:27 24.02.2003 -0600, beauchamp james w wrote: Snip >Just to understand the nomenclature here, by "autocorrelation" do we >mean autocorrelation of the pressure signal waveform? No. When I used the terms cross-correlation and autocorrelation I referred to the original meaning in mathematics and in belonging tools for general use. I beg your pardon for not yet having clearly enough distanced myself from what I consider inappropriate use of correlation methods and also from what I consider the stupid purely spectral point of view including the notion of localized templates to be learned and matched. I am convinced: In order to approach a solid understanding of hearing we have to realize that there are two steps. The first one is spectral analysis within the Organ of Corti, and it can be described as Fourier Cosine Transform. The second one is neurally implemented in at least two areas of dynamic spectro-temporal coincidence: superior olivar complex and cortex. The cortical correlational analysis may also be modeled as inverse Fourier Cosine Transform. So I imagine the cortex largely performing autocorrelation of the spectrum rather than of the pressure signal waveform. Eckard http://home.arcor.de/eckard.blumschein

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