定相 seeks to reproduce the 效果(效应) that arises when the 速度 of one of two 磁带 录机 simultaneously playing back the same 信号 is altered When the 延迟 时间 of about 0 5 ms is slowly modulated the changing 相位 关系 i e the 移位/偏移 of one 波形 相对 to another between the two 信号 causes a 数 of 频率 频带 alternately to be cut and boosted

The result of 定相 is a 'whooshing' filter-like 效果(效应) 不 unlike that of a 数 of wah-wah pedals linked together each affecting a different part of the 频谱 In a 图表 显示 of the 频谱 the 效果(效应) appears as a 移位/偏移 梳状 each 'prong' corresponding to a 共鸣 峰 - hence the 技术 name 'comb filtering' applied to the 用 of this 范围(排列) of 延迟 times 源 - Richard Dobson 1992 A 字典 of 电子 and 算機/计算机 樂/乐 技术 牛津 University Press