In message <7ca3d5a30904031519ya3b89hb87cf8f81a544...@mail.gmail.com>,
Neil Puttock <n.putt...@gmail.com> writes
2009/4/3 Anthony W. Youngman <lilyp...@thewolery.demon.co.uk>:
In message <mj9t1jgcvk1jf...@thewolery.demon.co.uk>, Anthony W. Youngman
<lilyp...@thewolery.demon.co.uk> writes
Ow!
Sorry, reading this was painful (I play the trombone, as many of you know
:-)
Replying to myself ... Just in case anyone didn't realise (and I certainly
didn't make myself clear :-) these are my revised versions that I think
should replace the existing entries. Feel free to edit and improve.
For example Concert A is 440Hz, the speed of sound in air is 343m/s,
therefore an A clarinet (or any other A wind instrument) will have a length
of 343/440 = 78cm. (Or be a power of 2 longer or shorter.)
Concert A is definitely not the fundamental for an A clarinet: it's a
cylindrical tube stopped at one end, so the wavelength of the
fundamental is four times the length. Since the lowest note on a
clarinet is usually the E below middle C unless it has an extension,
the fundamental would be C sharp (D on a B flat).
Ummm ... I think I might be getting physics fundamentals confused with
musical fundamentals. But I'm COMPLETELY puzzled at your statement that
the wavelength of the fundamental is FOUR times the length. I would
guess the trombone is also "a cylindrical tube stopped at one end", and
the wavelength of any note played must be an integral number of
half-wavelengths. So we have 1/2-wavelength giving me a pedal Bb, 2/2
giving me the fundamental Bb, and 3/2 giving me an F.
I don't see how the physics would work to give you a quarter-wavelength
as you claim.
Concert A would be either the first (B flat clarinet) or second (A
clarinet) overblown note, i.e., third harmonic of E or F.
Mmmm... I think that explains a lot. Most notes played by brass
instruments are "overblown" in the wind sense - do most wind instruments
mostly not overblow?
Regards,
Neil
Cheers,
Wol
(NB - it's my bedtime, apologies if I don't reply again to anything for
a while :-)
--
Anthony W. Youngman - anth...@thewolery.demon.co.uk
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