微调拨片轨迹可显著改变吉他音色，揭示演奏细节对声音的影响
The effect of micro-changes in the pluck trajectory on the sound of an acoustic guitar
- 用机器人拨片以192微米步进改变拨弦深度，系统测量音效变化
- 深度增加使音量上升、泛音减少、低频更丰满，但材料不同影响范围各异
- 研究结果对吉他测试与演奏技术优化有重要参考价值
本研究探讨了吉他拨片拨弦轨迹的微小变化如何影响原声吉他的音色。采用先进的机器人拨片装置，以192微米为步长逐步接近琴弦，增加拨弦深度，并分析其对音量、音色、谐波成分及衰减过程的影响。该方法针对六种不同材质的拨片重复进行，以考察拨片材料对变化响应的差异。结果表明，在较低深度时，弦未被充分激发，导致声音微弱且明显失真；该效应范围随拨片材料的力学特性而异。超过此范围后，深度增加使音量提升、非谐波成分和噪声降低，音色向低频更饱满、高频更粗糙的方向转变。研究揭示了拨弦轨迹与声学输出之间的微妙关系，强调了拨弦在吉他测试方法中的关键作用。
原文摘要 · Abstract (English)
This study explores how micro-changes in the plucking trajectory of a guitar pick influence the sound of an acoustic guitar. Using a state-of-the-art robotic plucker, a series of measurements has been performed, where the plectrum was moved towards the instrument by a step of 192 micrometers, resulting in an increased attack depth. It has been analysed how the effect of these changes is reflected in loudness, timbre, harmonic content and how the sound progresses during decay. This methodology has been repeated for guitar plectra made from six different materials to investigate how the pick itself influences the effect of a change in the plucking trajectory. The results of the study show that at a low depth the string is not fully excited resulting in weak and markedly altered sound. The range of this effect changes with the mechanical properties of the plectrum material. After this range an increase in depth results in an increase in sound loudness, a decrease in inharmonicity and noisiness and a shift in timbre where the sound becomes fuller in low frequencies and rougher. Presented findings help to understand the nuanced relationship between plucking trajectory and acoustic output. They provide important insights regarding the importance of plucking in guitar testing methodologies, showing that the mech
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