相位 描述 the stage that a particle has reached in a 周期 When an 对象 vibrates the 动作 from its 起始 位置 to a point of 最大 displacement in one 方向 followed by a 动作 in the opposite 方向 and a return to its 起始 位置 is called one 周期

Particles are in 相位 when they are at the same stage in the 周期 at the same 时间 and out of 相位 when they are at opposite stages 相位 is 测量 by the angle of rotation in 度 or radians

The 率 of change of 相位 is termed 频率 源 - 化约 from Barry Truax Handbook for Acoustic 生态学 CD-ROM Edition Cambridge Street 出版 1999 - CSR-CDR 9901