Any quantity or body is in a state of 振荡 when its 值 or 运动 is continually changing so that it passes through 最大 and 最小 价值 or positions When a 系统 body or quantity is set in period 运动 or 共鸣 it is said to be in 振荡

A swinging pendulum a 颤 string and a bobbing buoy are all examples of 振荡 and simple 谐/泛音 运动 However 随机性 噪 is also an 振荡 since it passes through 最大 and 最小 价值 Oscillations whose 频率 lies within the 可听 范围（排列） are 听 as 声波 源 Barry Truax - Handbook for Acoustic 生态学 CD-ROM Edition Cambridge Street 出版 1999 - CSR-CDR 9901