DIGITAL GUITAR AUTO-TUNER PROJECT - Page 8

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Re: DIGITAL GUITAR AUTO-TUNER PROJECT

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You do know that +2 Hz on the low E string (84'ish Hz) gets you halfway
to F.

Re: DIGITAL GUITAR AUTO-TUNER PROJECT
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i guess i have to correct myself for few mistakes;

     1. for the accuracy, that will be +/-2cents maximum. +/-1cent
must be nice.. not +/-2hz.
     2. for the harmonics, im wrong about the 12th root of two, that
is the even tempered scale. the other components found in the guitar
signal are supposed to be the harmonics factor of 2, 4, 6, 8 belongs
to the higher octaves.

     here comes another newbie question:

     does anyone have an exact idea how to safely "count" the
fundamental freq with all of these harmonics on the considerations?

Re: DIGITAL GUITAR AUTO-TUNER PROJECT

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High order lowpass?



Re: DIGITAL GUITAR AUTO-TUNER PROJECT
I read in sci.electronics.design that dhaevhid
AUTO-TUNER PROJECT', on Mon, 25 Apr 2005:
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2,3,4,5,6,7... Not only even-order.
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If your input signals do not cover as much as an octave, you band-pass
filter them before you FFT them. That gets rid of the harmonics.
--
Regards, John Woodgate, OOO - Own Opinions Only.
There are two sides to every question, except
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Re: DIGITAL GUITAR AUTO-TUNER PROJECT
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Marching harmonics are not likely to affect any one period by more than
ten percent. If you count the total time for 100 periods, the accuracy
becomes one part per thousand. To that, you must add the uncertainty of
your time measurement, up to perhaps two ticks on the counter.

In a way analogous to a bell's "clang tone", the harmonic structure
changes rapidly when the string is first plucked. Don't measure the
first part of the note, and don't try for such a long measurement that
the note fades away.

Jerry
--
Engineering is the art of making what you want from things you can get.
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ

Re: DIGITAL GUITAR AUTO-TUNER PROJECT
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My needle-based digital tuner reacts quite quickly.  I can see the note appear
sharp as it is first plucked, then watch it settle in to a fairly constant
reading for several seconds until it fades away.  In this case, it is up to me
as the user to ignore that initial transient reading and wait for the steady
state.  Doing so is quite natural.



Re: DIGITAL GUITAR AUTO-TUNER PROJECT

   ...

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If it's any good, you can also use it to tune an oboe.

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Think again. Once you have a squarewave, the time between successive
zero crossings in the same direction is the period.

   ...

Jerry
--
Engineering is the art of making what you want from things you can get.
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ

Re: DIGITAL GUITAR AUTO-TUNER PROJECT
snipped-for-privacy@hotmail.com says...
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I've read (most of) the answers here and they've gone for the first
things I'd try, so it's out-of-the-box time [*]. What about an optical
interrupter (or reflection) at the center (maxima) of the string
feeding a microcontroller's timer?
 

[*] ...or was that off-the wall time ;-)  

--
  Keith

Re: DIGITAL GUITAR AUTO-TUNER PROJECT

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Ok, so my optical idea wasn't taken well. What about dopler radar?  I
remember when police radars were calibrated using tuning forks.

Yeah, microphones are just too obvious.  ;-)

--
  Keith


Re: DIGITAL GUITAR AUTO-TUNER PROJECT
someinteresting reading about harmonics and overtones

harmonics overtones modes inhamonicity

http://www.postpiano.com/support/updates/tech/Tuning.htm

http://www.acoustics.auckland.ac.nz/research/research_files/keane_nzas04.pdf


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