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Re: stereo parabola field test

Subject: Re: stereo parabola field test
From: Walter Knapp <>
Date: Tue, 13 Apr 2004 10:21:04 -0400
From: "Randolph S. Little" <>

> What seems to have been proven by Lang's experiment is that most of the "=
quiescent" signal comes from directions other than that of the axis of the =
reflector, such that the two mikes actually received uncorrelated signals. =
 I suspect that any "quiescent" signal arriving on-axis of the reflector wo=
uld be directly additive between the two channels, but that such components=
 are swamped by the majority being off-axis either left or right and theref=
ore not being received equally by both mikes.

Actually, that central subject is additive, which is part of why they
stand out in the stereo field. On top of just the gain from the parabola
the stereo adds a little more. Btw, some of the addition is done in our
brains in processing the two channels. Both ears hear the sound equally
we tend to lock on to that sound and bring it out.

Most of the soundfield recorded is local ambiance and is generally
recorded much stronger on one mic over the other. So won't get a
additive effect. Though it does get gain depending on how close to the
center axis it is.

I think of the soundfield that I can record with the Telinga as being
pear shaped. Big, round body of local ambiance, long neck pointing out
along the central axis.

Walt




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