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Klarinet Archive - Posting 000228.txt from 2001/02

Subj: [kl] Re: strange intonation in warm up exercise
Date: Wed, 7 Feb 2001 17:19:28 -0500

Bill H.,

I am inclined to agree with you on this, but on the other hand, science is
fact, right? Difference tones are either manufactured in our ear or not.
Hear's how I understand difference tones and, Bill W., you can judge this
against Bonades theories? facts?

My thinking is that difference tones and "beats" are related. Beats are
caused by nodes of two different sound waves aligning at a given moment. The
alignement of these nodes creates a surge in the amplitude (volume) at that
given moment. When you have two pitches sounding closely in tune, the nodes
will align at regular intervals but infrequently. As these tones become
gradually spread apart in pitch, the alignment of the nodes, thus the surges
of amplitude, will occur at a increased rate. It is possible that the
frequency of these amplitude surges can create in themselve a different
pitch. By this reasoning, these alignments occur less frequently than either
generated pitche and, so, the created third pitch would be lower than either
of the generated pitches. This is coroborated by the fact that all
difference tones are lower than either generated tone.

I hope my explanation is clear. By this reasoning difference tones occur in
the air before they get to a membrane like the ear. Do Bonade's
explainations blow this reasoning out of the water?

Tom Labadorf

In a message dated 2/7/01 4:15:50 PM, writes:

<< You may be misreading Benade or something, but I don't think things like
wall-shaking resultant bass organ notes would work if summation of sound
waves was not purely a matter of physics. Nor would standing waves cause
any problems. A difference tone does not need to be manufactured; it
exists in the air, as surely as two pebbles dropped in a pond will cause
interfering waves in the water.

Bill Hausmann
451 Old Orchard Drive
Essexville, MI 48732 ICQ UIN 4862265 >>

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