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 谐波（泛音） 运动 However 随机性 噪音 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 声音 源 Barry Truax - Handbook for Acoustic 生态学 CD-ROM Edition Cambridge Street 出版 1999 - CSR-CDR 9901