Klarinet Archive - Posting 000546.txt from 2001/02

From: Tony@-----.uk (Tony Pay)
Subj: Re: [kl] Difference Tones
Date: Thu, 15 Feb 2001 03:13:07 -0500

On Wed, 14 Feb 2001 23:46:15 -0500, bhausmann1@-----.com said:

> But all the evidence is that the walls, microphone diaphragms, etc.,
> are vibrating AT 8 HZ! This would mean that SOMETHING is producing
> that frequency. If it is not the pipes, then what? Either these
> objects are responding to sound waves in the air produced by the organ
> pipes, or they are themselves creating the sound waves with their own
> vibrations. But if that is the case, what is causing them to vibrate
> AT THAT FREQUENCY?

There's a third option other than your either/or.

What causes the objects to vibrate at 8 Hz is the interaction between
one aspect of their properties (nonlinear response to vibration), and
the fact that they are being stimulated by two frequencies that differ
by 8 Hz.

The thing to see is that something doesn't have to be *vibrated* at a
given frequency in order then to vibrate at that frequency.

Tony
--
_________ Tony Pay
|ony:-) 79 Southmoor Rd Tony@-----.uk
| |ay Oxford OX2 6RE GMN artist: http://www.gmn.com
tel/fax 01865 553339

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