Using Everyday Examples in Engineering (E3) Physics Waves and Sound: The Guitar
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1 Using Everyday Examples in Engineering (E3) Physics Waves and Sound: The Guitar Samuel Hokin, IMS LLC The guitar is the most common stringed instrument, and shares many characteristics with other stringed instruments. For example, the overtones potentially available on any stringed instrument are the same. Why, then, does a guitar sound so much different from, say, a violin? The answer lies in which overtones are emphasized in a particular instrument, due to the shape and materials in the resonator (body), strings, how it's played, and other factors. In the course of studying the overtones, or harmonics of a string fixed at both ends, we will uncover the overtone series for strings, which is the basis of Western harmony. Waves on a String A guitar string is a common example of a string fixed at both ends which is elastic and can vibrate. The vibrations of such a string are called standing waves, and they satisfy the relationship between wavelength and frequency that comes from the definition of waves: v = fλ where v is the speed of the wave, f is the frequency (measured in cycles/second or Hertz, Hz) and λ is the wavelength. The speed v of waves on a string depends on the string tension T and linear mass density (mass/length) µ, measured in kg/m. Waves travel faster on a tighter string and the frequency is therefore higher for a given wavelength. On the other hand, waves travel slower on a more massive string and the frequency is therefore lower for a given wavelength. The relationship between speed, tension and mass density is a bit difficult to derive, but is a simple formula: v = v T/µ Since the fundamental wavelength of a standing wave on a guitar string is twice the distance between the bridge and the fret, all six strings use the same range of wavelengths. To have different pitches (frequencies) of the strings, then, one must have different wave speeds. There are two ways to do this: by having different tension T or by having different mass density µ (or a combination of the two). If one varied pitch only by varying tension, the high strings would be very tight and the low strings would be very loose and it would be very difficult to play. It is much easier to play a guitar if the strings This material is based upon work supported by the National Science Foundation (NSF) under Grant No Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of NSF.
2 all have roughly the same tension; for this reason, the lower strings have higher mass density, by making them thicker and, for the 3 low strings, wrapping them with wire. From what you have learned so far, and the fact that the strings are a perfect fourth apart in pitch (except between the G and B strings in standard tuning), you can calculate how much µ increases between strings for T to be constant. String Harmonics (Overtones) If a guitar string had only a single frequency vibration on it, it would sound a bit boring (you can listen to a single frequency sound with the Overtones Applet ( What makes a guitar or any stringed instrument interesting is the rich variety of harmonics that are present. Any wave that satisfies the condition that it has nodes at the ends of the string can exist on a string. The fundamental, the main pitch you hear, is the lowest tone, and it comes from the string vibrating with one big arc from bottom to top: fundamental (l = λ/2) The fundamental satisfies the condition l = λ/2, where l is the length of the freely vibrating portion of the string. The first harmonic or overtone comes from vibration with a node in the center: 1st overtone (l = 2λ/2) The 1st overtone satisfies the condition l =λ. Each higher overtone fits an additional half wavelength on the string: 2nd overtone (l = 3λ/2) 3rd overtone (l = 4λ/2) 4th overtone (l = 5λ/2)
3 Since frequency is inversely proportional to wavelength, the frequency difference between overtones is the fundamental frequency. This leads to the overtone series for a string: overtone f/f 0 freq/tonic approx interval fundamental 1 1=1.0 tonic 1 st 2 1=1.0 tonic 2 nd 3 3/2=1.5 perfect 5 th 3 rd 4 1=1.0 tonic 4 th 5 5/4=1.25 major 3 rd 5 th 6 6/4=1.5 perf 5 th 6 th 7 7/4=1.75 dominant 7th 7 th 8 1=1.0 tonic 8 th 9 9.8=1.125 major 2nd 9 th 10 10/8=1.25 major 3rd 10 th 11 11/8=1.375 between 4th and dim 5th 11 th 12 12/8=1.5 perfect 5th 12 th 13 13/8=1.625 between aug 5th and maj 6th Most of the first 12 overtones fall very close to tones of the Western musical scale, and one can argue that this is not coincidence: it is natural to use a musical scale which incorporates the overtones of stringed instruments. The equal-tempered scale has 12 intervals (half-steps) making up an octave (factor of two). The ratio, r, of frequencies for a half-step therefore satisfies r 12 =2, which means r= The scale, notated with interval names, then corresponds to frequency multiples of: tonic maj2nd maj3rd 4th 5th maj6th maj7th octave min2nd min3rd dim5th aug5th dom7th The top row shows the intervals of the major scale. The equal-tempered scale and overtone series don't match perfectly, of course, but the difference between, say, a major 3rd of the equal-tempered scale (1.2599) and the 4th overtone (1.2500) is pretty hard to hear. In fact, I often tune my guitar using harmonics. I strike a B at the 7th fret (2nd overtone) of the bottom E string to tune the B string. This means that my B string is at a pitch of above E rather than the equal-tempered value of , ie. the B string is slightly sharp. I tune the A string by striking at the 5th fret of E (3rd overtone) to get an E which matches the E I make on the A string by striking the 2nd overtone at the 7th fret. This means my A string is 4/3= above E rather than of the equal-tempered scale, ie. it's slightly flat. Then I do the same match to get the D from the A string, which means my D is 4/3 above A or 16/9= above E rather than of the equal-tempered scale, ie. it's even more flat. That leaves the G string, which becomes a problem. The B
4 string above it is sharp and the D string below it is flat, so there's a mismatch: if I tune the G string from the D string, it is really too flat, and if I tune the G string from the B string it is sharp. Alternatively, I could use the 4th overtone of E, which is hard to make loud, to get a G at 5/4=1.2500, which is slightly below the equal-tempered value of This deviation from equal-tempering when you use harmonics to tune is a pain, and sometimes you're better off just matching the next string up to that note on the lower string since the frets are spaced to produce the equal-tempered scale. Guitar Overtones The thing that makes a guitar note "guitarry" is the overtone content and how the note rises and decays in time. This varies with how you play it, such as with a pick vs. a finger, or near the bridge vs. in the middle. (This, of course, isn't counting all the electronic methods for emphasizing different overtones such as the bass/treble control on electric guitars.) As an example, I sampled the A string on my nylon-string guitar played two different ways: plucking in the middle, which emphasizes the fundamental and odd-multiple overtones which have a peak in the center of the string, and plucking near the bridge, which produces more of the even-multiple overtones with nodes in the center of the string to make a more "twangy" sound. Here are sample waveforms taken about a half second after the string was struck:
5 This figure above shows the waveform when the string is plucked in the center. The fundamental is at A 110 Hz and is very large. Note that the odd-multiple overtones (330 Hz, 550 Hz, etc.) are much larger than the even-multiple ones (220 Hz, 440 Hz, etc.). This is very characteristic of a nylon string guitar played this way, which is pretty far from "twangy". The waveform is close to a triangle wave, which results when only the odd-multiple overtones are present. This is the same note plucked near the bridge to make a "twangy" sound. The overtone content is much richer, with plenty of even-multiple overtones present. Note also that the waveform amplitude is smaller. A "twangy" note dies out much more quickly than a note with a strong fundamental like the previous one. You can hear these two sounds in the Guitar A String applet. (
6 Fret Spacing You've probably noticed that the frets on a guitar get closer together towards the bridge. From the fact that each successive note is r= higher in pitch, and the fact that v=fλ=constant on a given string, we can figure out the fret spacing. Let's say the open string length is l. Then the first fret must be placed a distance l/ from the bridge, the second fret a distance l/1.0595² from the bridge, and so on. The twelfth fret, which makes an octave, is at a distance l/ =l/2 from the bridge. The diagram below shows the fret positions (as does the photo at the top of this page for that matter!). Equations wave velocity, frequency, wavelength: v = fλ standing waves on a string of length l: l = nλ/2 (n is a positive integer) half-step frequency ratio in equal-tempered scale: r 12 = 2 -> r = Applets The Overtones Applet - The Guitar A Applet: Summary A guitar string sound consists of standing waves: the fundamental and overtones. The fundamental wavelengh is twice the length of the vibrating part of the string. The Western musical scale is based on the overtone series for a string: all the overtones up to the 9th are close to notes of the equal-tempered scale (and define the notes of the perfect-tempered scale). The timber of a stringed instrument depends on the overtone content of the sound: a "twangy" sound has both odd and even multiples of the fundamental, while a "smooth" sound tends to have only odd multiples Samuel Hokin. All rights reserved. Copies may be downloaded from This material may be reproduced for educational purposes.
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