This 算法 is concerned with the emulation of the vibratory 行为 of a plucked string The 作品 of Kevin Karplus and Alex Strong in string 模型(建模) during the late 1970s further by David Jaffe and Julius Smith at Stanford University has resulted in a 合成 工具 of considerable versatility The 基础 acoustic 模型 is simulated in the 形(曲)式 of a variable 长度 数字 延迟 line energised by 噪音 and incorporating a 回授(反馈) path via an attenuator coupled to an adjustable 低通 滤波器 which induces 共鸣 akin to those of a 颤 string Suitable adjustments of these 参数 can 改变 the 衰(减) of the string 声音 from a plucked characteristic to a 延(续) one with the possibility of changing 音高 不 only in 离散 steps but also by 手段(意味着) of glissandi thus introducing 强大 facilities for gestural 控制 Further adjustments allow the percussive 特征 of plucked string 声音 to be transformed into a 数 of drum-like 音色 源 - Peter Manning 1993 电子 and 计算机 音乐 Second Edition 牛津 University Press