Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!hao!husc6!bbn!rochester!ur-tut!ur-cvsvax!jea
From: jea@ur-cvsvax.UUCP (Joanne Albano)
Newsgroups: comp.sys.amiga
Subject: Re: Sonic Tomfoolery
Message-ID: <716@ur-cvsvax.UUCP>
Date: 25 Feb 88 14:11:32 GMT
References: <319@ardent.UUCP>
Organization: Center for Visual Science, Univ. of Rochester
Lines: 32

In article <319@ardent.UUCP>, rap@ardent.UUCP (Rob Peck) writes:
> We have two ears, and two output channels to fool with on the Amiga.
> Then, not only control the volume, but also control the phasing
> between the two channels a little bit so as to create a distance
> perception "somewhere out there in front of me to the left or the
> right"...
> But what kind of controls must I apply to make the sound appear
> to be "behind me"?????
> Just thought someone else here might have a ready answer.  When
> Rob Peck			...ihnp4!hplabs!ardent!rap

You asked a good question because this is a case where the
nervous system is more readily fooled. In fact, when the signal
is behind you it is equivalent to both ears! And so it is when
the signal is in front of you too. How is this resolved?
First there are times when it is not resolved and thew brain
is confused. Second, more typically one moves ones head which
immediately provides a cue. Third, the external auditory meatus
(called simply by some as ears) has the effect of attentuating the
signal a bit and this can provide a cue in the proper context.
I suggest that you provide context to your signal and inject a
simulated head movement by having the signal move slightly off the
midline so it has a directional component and perhaps a slight
attentuation too.

I am not an auditory psychobiologist but I have some training
on this. Actually Im a visual psychobiologist.

-- 
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 Joanne Albano, Center for Visual Science     (716) 275-6848
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