Period

周期

A term derived from the study of the physics of sound, and used in acoustic phonetics, referring to the time it takes for a cycle of pressure variation in a sound wave to repeat itself. The shorter the period, the more cycles there will be in a given unit of time, and thus the higher the frequency.

原为物理声学术语，现用于声学语音学，指声波中一个压力变化周重复一次所需的时间。周期越短，给定单位时间内的周数越多，频率就越高。