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Subject: Re: Bullshit wins v. science
Date: Thu, 7 Nov 2002 19:29:55 -0600
Organization: Posted via Supernews, http://www.supernews.com
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
I'm new here and just tapped in, but there is a HUGE body of literature
(some of which I wrote) concerning how the ears localize. Lows very poorly
but some with phase shift or time of arrival. Highs by intenisty
differences due to head blocking.
Mark Zenier wrote in message
> In article ,
> Kevin Aylward wrote:
> >"Mark Zenier" wrote in message
> >> In article ,
> >> Kevin Aylward wrote:
> >> >This is a misconception. The ear is *absolutly* *insensitive* to
> >> >A static phase shift is quite undetectable. It is a Fourier analyser.
> >> Er, are you deaf in one ear? Both ears combine to be sensitive to
> >> phase in some of the frequency range.
> >> Take a mono signal and feed it into headphones and you'll get a
> >> sound source that's small point in the center of your head. Swap the
> >> wires on one ear's speaker, and the perception changes to a diffuse
> >> sources outside your head, on either side.
> >Ahmmm. Again, This is a misunderstanding. As I *keep* pointing out, yes
> >is possible to detect phase difference by *comparison* of one signal
> >with another. I have made this quite clear that adding/subtracting *two*
> >signals will result in frequency response effects. It is the frequency
> >spectrum effect you detect, not the phase.
> I'm having a semantic quibble about the dogmatic statement you made.
> The point is that "the ear" has two senses, one that percieves WHAT you
> are hearing, the other WHERE the sound is coming from. I contend that
> the latter uses phase, or time of arrival in the millisecond time scale.
> (I don't remember a reference to humans, but I remember science media
> coverage of some little pencilneck bird down in Australia (a plover
> or something) that some researchers were trying to figure out how it
> could get direction information from a wavelength ten times the size of
> its head).
> >However, this is not relevant at all to the statement that the ear is
> >quite insensitive to static phase shifts. That is, take a signal. Pass
> >it through a phase shifter, either constant or phase varying with
> >frequency. Listen to the output *on its own*. You will simply not be
> >able to hear any difference.
> Try this. Get a monophonic noise source. White noise, or better
> something that has a nice crackle or rustle. (Something from our
> evolutionary past indicating dinner). Add in a nice 400 Hz, or
> thereabouts sine wave, to add a bit of depth. Feed this into
> one ear. For the other ear, feed the signal though a allpass filter
> or time delay, that can be switched into the circuit or bypassed.
> Put on the headphones and switch the filter in and out.
> WHAT you're hearing may not change. But WHERE the sound seems to
> come from sure will.
> Or just try to listen to Midnight Oils "Diesel and Dust" CD on
> headphones. Enough platform motion to make you seasick.
> Mark Zenier email@example.com Washington State resident
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