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Re: Temporal encoding of pitch from resolved harmonics

From: Peter Cariani <peter@epl.meei.harvard.edu>
>Hi Chris, Annemarie,
>Various groups of people use the terms spectral information
>and spectral cues in different ways.
>It helps to be clear about whether one is talking about
>1) frequency-related structure in the power spectrum of the stimulus,
>(acoustical sense) or
>2) frequency-based neural representations of the stimulus,
>(neurophysiological sense) or
>3) the ability of listeners to discriminate different acoustic spectra
>(psychophysical sense).
just to mention that in digital signal processing you are generally
calculating spectral information (coefficients as components in the
frequency domain, e.g., "resolved harmonics") proceeding from the
(digitized) temporal representation ("wave form") of a given signal,
e.g., by means of the Fourier analysis -- and inversely (note that the
Fourier transform is sort of a change of the coordinate system). In case
of a periodic signal, you would have what you might refer to by
"temporal phase locking", first, by virtue of (mathematically) taking
its repetition rate/frequency, or periodicity, into account (for the
fundamental ; oscillation pattern/envelope relate to additional
components), as well as by the fact of its periodically being sampled
(i.e., sampling frequency (f_s)/sampling interval (delta t), where
f_s=1/delta t).
Alexandra Hettergott.

Alexandra Hettergott
1, avenue des Gobelins
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F-75005 Paris/France
Tél/fax:   +33-(0)1-43 31 41 27
Mél:        a.hettergott@wanadoo.fr
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