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MMD > Archives > March 1998 > 1998.03.26 > 06Prev  Next

Side-Strike Tone of Vibrating Bar
By Hans van Oost

<P>In MMD 980325 I wrote:
<BLOCKQUOTE TYPE=CITE>....An interesting property of vibrating bars is
their side-tone.....</BLOCKQUOTE>
Robbie's comment was:
<BLOCKQUOTE TYPE=CITE>[ I think 'side-tone' is known in English as the
overtone or partial.

 [ Editor's note:
 [> Content-Type: text/html; charset=us-ascii
 [ Ugly, isn't it, when HTML encoding isn't viewed with a web
 [ browser or a fancy new e-mail viewer.  We can't use HTML yet in
 [ MMD because so many old e-mail programs are used by our readers
 [ (including the old UNIX system at foxtail).
 [ Authors, please help me by sending e-mail using only ISO-8859 or
 [ US-ASCII.  Then I can edit the Digest quickly and have time left
 [ to write comments (or to get more sleep at night ;)
 [ Thanks,  Robbie

In MMD 980325 I wrote, "... An interesting property of vibrating bars
is their side-tone ..."

Robbie's comment was:

>[ I think 'side-tone' is known in English as the overtone or partial.
>[ The resonant chamber (pipe) of wind instruments produces overtones ...

I may not have made myself clear yesterday, but I meant what I wrote.
According to the Dutch campanologist Andre Lehr, who has done research
on the properties of vibrating bars, the natural harmonics of these
bars, when straight and not hollowed, are: fundamental - octave+quart!
- double octave+semitone.  So if the fundamental is c2, the harmonics
will sound as f3 and c-sharp 4 !

The side-tone of a vibrating bar is, in effect, the tone that this
bar would make predominantly if the bar is struck from the side.  The
frequency of the fundamental is proportionate to its thickness.

Of course I totally agree with Robbie's last statement!


Hans van Oost, Netherlands

 [ Editor's note:
 [ Aha!  That's a lateral vibrating mode; I don't know a common name
 [ in English, so, until we learn the right name, let's call it the
 [ "side-strike tone".  ("Side-tone" is the jargon for the audio signal
 [ sent from the telephone microphone directly to the earphone, so
 [ that the talker has aural feedback.)
 [ I think that Scientific American magazine, a few years ago, had a
 [ very interesting article about the multiple modes of ancient bells
 [ found in China.  It was apparent to the researchers that several
 [ different notes were to be played, simultaneously, on the same
 [ tubular bell.
 [ -- Robbie

(Message sent Thu 26 Mar 1998, 18:52:29 GMT, from time zone GMT.)

Key Words in Subject:  Bar, Side-Strike, Tone, Vibrating

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