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 数字 延迟 line energised by 噪 and incorporating a 回授（反馈） path via an attenuator coupled to an adjustable 低通 滤器 which induces 共鸣 akin to those of a 颤 string Suitable adjustments of these 参数 can 改 the 衰（减） of the string 声波 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 中项 of glissandi thus introducing 强大 facilities for gestural 控制 Further adjustments allow the percussive 特征 of plucked string 声 to be transformed into a 数 of drum-like 音色 源 - Peter Manning 1993 电子 and 算機/计算机 樂/乐 Second Edition 牛津 University Press