Re: headphones + FCT + strange phenomenon

[Eckard Blumschein <Eckard.Blumschein@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

Perhaps, www.headwize.com provides valuable information on headphones,
etc., too. Please find links to several adjacent forums like headwize via
my new address http://home.arcor.de/eckard.blumschein

The reason for me to have a private address was publicly uttered distrust
in my suggestion that ambiguity, redundancy and non-causality of the
traditional Fourier transform can be overcome by simply using the well
known one-sided Fourier cosine transform (FCT) instead of Fourier Transform
(FT) in case of signals f(t) being limited to the past, that is, being
limited to positive elapsed time t>0. After fierce discussion with
physicists I feel, I am correct. Calculation of FCT is no problem at all
because you will find largely the same correspondence table as for FT. The
first and major difference is the range of integration. While FT spans from
minus infinity to plus infinity, FCT and its inverse are restricted to
positive values only. Secondly, the FCT is just a real part of an integral
with the same exponential kernel as for FT. However this does not matter
because its imaginary counterpart, the Fourier sine transform (FST), would
relate to quite a different original f(t) with odd continuation on the
mirror plane.

I would also like to ask whether someone else experienced the same strange
phenomenon: I looked at spatial orientation of our cochleas. Axes are
forward directed as are our eyes, too. Accordingly, sudden rotational
movement of my head does not elicit any noticeable auditory sensation as
long as axis of this rotation does not coincide with axes of the cochleas.
I may move my head as fast as I can to the left as well as to the right,
also up and down. However, as I expected, I hear for a moment a high
pitched tone if I rapidly tilt my head down toward my right shoulder. To
the opposite side the pitch tends to be apparently different. Admittedly, I
am suffering from tinnitus quite a little bit.

Eckard

At 10:47 23.10.2002 -0400, Robert E. Remez wrote:
>Dear list:
>
>Have you calibrated a Beyerdynamic DT770 headphone set? I would be
>grateful to know of the measures, specifically, for converting AC
>voltage to SPL.
>
>Thanks,
>
>        Robert Remez
>
>--
>
>=============================================================
>Robert E. Remez                 212.854.4247 office
>Ann Whitney Olin Professor      212.854.3601 fax
>Department of Psychology                212.854-2069 Department
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