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八度泛音（Artificial harmonic）的演奏
To produce an artificial harmonic, a stringed instrument player holds down a note on the neck with the non-dominant hand, thereby shortening the vibrational length of the string, uses a finger to lightly touch a point on the string that is an integer divisor of its vibrational length, and plucks or bows the side of the string that is closer to the bridge. This technique is used to produce harmonic tones that are otherwise inaccessible on the instrument. To guitar players, one variety of this technique is known as a pinch harmonic. Many guitarists, chiefly of the heavy metal genre (such as Eddie Van Halen, Dimebag Darrell and Kerry King, and the bands Tremolocaust and Nile), also rapidly bend or use a vibrato on the string to create a high pitched squeal, in addition to creating the artificial harmonic.This technique, like natural harmonics, works by canceling out the fundamental tone and one or more partial tones by deadening their modes of vibration. See node.
八度泛音（Artificial harmonic）
為了克服自然泛音的局限性，我們使用另一種泛音奏法——八度（人工）泛音（harm.8），有時我們稱之為右手泛音或人工泛音。八度泛音可將泛音在吉他上擴展到半音階的范圍。雖然這種泛音的音量不太大，但它更有利于將泛音和它相應(yīng)的實音音高統(tǒng)一起來。八度泛音同時需要右手食指、無名指和左手的一個手指作用于同一根琴弦上來完成。在彈奏時，左手仍按照通常的方式將弦按到指板上，并持續(xù)壓住琴弦直到這個音結(jié)束。右手食指在左手所按品與琴馬間距離準確的1／2處瞬間輕觸琴弦（這個點比左手手指按的實際音高出12個品或一個八度。例如，第一弦第一品“F”這個音的八度泛音點，應(yīng)在第13品的地方），用無名指去撥弦。
泛音，英文稱為Harmonics，在弦樂的演奏技巧上最常用到的人工泛音為Touch fourth。一躍兩個八度音程，音脆如笛聲，細膩得讓人有一種不穩(wěn)定的平衡感。除了發(fā)音體整體振動產(chǎn)生的最低的音是基音，以基音為標準，其余1/2、1/3、1/4等各部分也是同時振動，是泛音。泛音的組合決定了特定的音色，并能使人明確地感到基音的響度。樂器和自然界里所有的音都有泛音。人工泛音的發(fā)音原理是用左手按下吉他上任何一個非空弦音，然后找到以這個音為基音的 1/2泛音點，也就是距這個音第十二品格的位置，即這個音弦長的1/2處，象演奏自然泛音一樣，用右手1指輕觸泛音點，用右手a指（演奏低音弦時有時也用p指撥弦）在離泛音點盡量遠處撥彈琴弦，在a指發(fā)音同時 i指果斷離弦，就發(fā)出了比基音高八度的泛音。演奏人工泛音左手按弦同時如能揉弦還能美化音色。人工泛音也常被稱為八度泛音，因為人工泛音主要由右手完成，所以也被叫做右手泛音。人工泛音一般用表示八度的8va、或0ct.來表示。
八度泛音（Artificial harmonic）的演奏
八度泛音 Artificial Harmonic：To play an artificial harmonic, fret the note in the left hand, then with the index finger of the right hand, lightly touch the same string 12 frets higher. Using another finger of the right hand, now pluck the string. As you do so, remove the index finger to allow the string to vibrate. The sound will be an octave higher than the fretted note, but more delicate and 'flute-like' than usual. There is no universal standard for how to write artificial harmonics, the triangular brackets shown above are the most common - the number 14 indicates that the string is lightly touched at this point, meaning the stopped fret will be 12 below this on the 2nd fret.
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