Subject: Re: Pitch & fundamental frequency
From: miriam clinton (iriXx) (iriXx@iriXx.org)
Date: Fri Sep 09 2005 - 14:45:12 EDT
Ian Stewart wrote:
> Kevin Austin writes:
>> There are other 'intuitive' things in acoustics which are incorrect.
>> The most blatant being that brass instruments produce the harmonic
>> series. Brass instruments are pipes stopped at one end, and therefore
>> produce the odd-numbered partials (.5, 1.5, 2.5, 3.5 = 1, 3, 5, 7 ...).
> Perhaps I misunderstand, but brass instruments are more complex than
> simple closed tubes. The piping acts much like a closed tube, but the
> mouthpiece and flare shift the partials significantly, producing
> something approximating a complete harmonic series (the flare raises
> the lower partials, while the mouthpiece flattens the higher ones).
interesting as my readings elsewhere have lead me to this:
"Is the Universe Out of Tune"
where measuring frequencies of the cosmic microwave background show that
the fundamental and first two partials have far lower resonances than
expected - almost to the effect we are describing musically. one of the
possible theories as to why is that the universe's topology may well be
in the shape of a giant tube bent back on itself several times, causing
on the other hand, their models of reference looked not unlike maps of
frequencies for drums - drums and bells are also known to have irregular
getting a little off topic but i've been fascinated by this stuff lately.
-- 99% of aliens prefer Earth --Eminem
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