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why is there over tone just on specific notes - guitar
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Elad
Tsabeat/Sattel Battle
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Posted : Feb 9, 2011 06:14:44
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freechameleon
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Posted : Feb 9, 2011 09:17
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i'd guess it has to do with the resonance frequencies of the body and the strings of your guitar. |
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daark
IsraTrance Full Member
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Posted : Feb 9, 2011 17:18
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Locrian
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Posted : Feb 9, 2011 22:49
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In short. The reason why you can play natural harmonics only at specific places on the necks is because of the laws of physics.
Harmonics/Overtones exist only at specific intervals. Each is a multiplier of the base tone. The forumla is for the nth harmonic of the basetone b is nxb.
As an example if the base tone is 55Hz(the note A) then the first harmonic will be at 110 Hz(an octave up), the second will be at 165(an octave and a 5th) and so on.
When a string is set into motion an produces sound it will not only oscillate at the full length but also at half length producing the first harmonic and so on. When you play a natural harmonic you effectively dampen the full length oscillation leaving only the half length and those above left. That is why the 12th fret harmonic is an octave above the open string.
For a more detailed description I refer you to wiikipedia http://en.wikipedia.org/wiki/Harmonics
 http://soundcloud.com/locrian/tracks |
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knocz
Moderator
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Posted : Feb 10, 2011 07:42
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Easier said: It will do that on each 1/2, 1/3, 1/4, 1/5 (etc) of the string length.
If you use your left (chord) hand to squeeze someplace else, you can transpose the harmonics to work on other frets (use your other [strumming] hand for the harmonic) 
Super Banana Sauce http://www.soundcloud.com/knocz |
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Shiranui
IsraTrance Full Member
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Posted : Feb 10, 2011 23:53
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you will get overtones anywhere on the string, it's just that the lower the denominator of the fraction, the louder it will be
for example you will also get overtones at 1/10th (or 4/10ths for that matter) the string length, but it won't be as loud as 1/2
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Locrian
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Posted : Feb 11, 2011 01:19
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knocz : The question was about why, not how.
Shiranui: Practically you will have a hard time playing the smaller fractions. Also, above the 9th harmonic there will not nesscessarily be in-key notes. The 10th harmonic is an off-key 4th as an example.
http://soundcloud.com/locrian/tracks |
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