This brings back memories of a pysics wave lab setup I built back in college
that was so annoying I can't resist describing it to a younger generation. My
son has an old EMU emulator that he was able to program for a full keyboard
using this concept.
Because I alredy had a reputation for being obnoxious and annoying, the
instructor isolated me in in a cinder block storage room containing all kinds
of neat stuff, including signal generators and transducers (horn speakers). It
didn't take me long to discover the interesting properties of two audio
oscillators operating at high power above the human audible range, but beating
at a quite audible frequency. Meanwhile, I set up some of Cabbage's standard
rope tricks to show to my unsupecting victims, then watched them go slowly nuts.
Come to think of it, Tippet would probably love to write a concerto for it.
In a message dated 1/26/2005 1:54:14 PM Eastern Standard Time, David Goldberg
<[EMAIL PROTECTED]> writes:
>The notes are there, the sum and the difference of the frequencies, but as
>Hans says, probably too weak to hear well, with all that singing and
>playing going on.
>
>You will hear these other two notes even if the primary tones are out of
>tune, but the secondary tones will be *very* out of tune. I have an
>ancient vinyl recording of classical unaccompanied flute duets which are
>sometimes very annoying because of the loud droning of the difference
>frequency. It sounds like someone turned on an electric fan in the room.
>
>It's lots of fun to begin singing on the note you are playing, then
>slowly raise the sung pitch - you will hear the individual beats until
>the difference is enough to call it a note. Sounds like an airplane
>taking off.
>
>
> { David Goldberg: [EMAIL PROTECTED] }
> { Math Dept, Washtenaw Community College }
> { Ann Arbor Michigan }
>
>
>_______________________________________________
>post: horn@music.memphis.edu
>unsubscribe or set options at
>http://music.memphis.edu/mailman/options/horn/billbamberg%40aol.com
>
_______________________________________________
post: horn@music.memphis.edu
unsubscribe or set options at
http://music.memphis.edu/mailman/options/horn/archive%40jab.org
