Re: stereovision question (means of perceiving depth)

[P3D Jim Crowell <crowell@xxxxxxxxxxxxxxxxx>]

At 10:28 AM 4/10/96, P3D Eric Goldstein wrote:
>
>At ten feet, the time or phase difference our two ears discriminate is one of
>the most important cues in letting us perceive the directional source of the
>sound (or it's nearest reflection). But at three inches, when the timing
>difference is too small to be perceived, the inverse square law (as it relates
>to sound amplitude) steps in and makes the differential in
>loudness between our
>two ears significant enough to detect.
>

It also depends on the frequency content of the sound.  At high
frequencies, relative phase becomes less useful, but you get
more of a "shadow" effect (sounds being blocked on one side by
the head).

-Jim C.


------------------------------------------------
Jim Crowell
School of Optometry
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