audible resultant from two supersonic frequencies?

[Richard Moody]

----- Original Message -----
From: Sarah Fox <sarah@gendernet.org>
To: Pianotech <pianotech@ptg.org>
Sent: Tuesday, December 03, 2002 4:50 PM
Subject: Re: audible resultant from two supersonic frequencies?


>  I don't doubt the creation
> of a 500 Hz signal, but I'm not sure really what is going on
with this
> experiment.


What did you think of the sound?




>
> Playing two notes very loudly on the piano is probably a better
test, since
> nonlinearities are known in string behavior and since it is
quite possible
> for movement induced by one string to modulate the vibratory
behavior of an
> adjacent string -- probably with both frequency- and
amplitude-modulation
> components.  Very messy!

Yes there is stuff happening that will take another 1,000 years to
comprehend as far as the human mind is concerned.  Meanwhile I am
amazed at how good pianos sound especially right after they are
tuned.     ---rm





 Adding to the messiness are the unisons, whose
> phasing and pitch (realistically) are variable.  The experiment
might be
> aided by muting two of the three unisons on each note.  Of
course that
> decreases the RMS amplitude by almost 5 dB.
>
> Peace,
> Sarah
>
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