A device that generates high-frequency pulses(usually a square wave) for purposes of synchronization and event timing. Most are crystal oscillators that take advantage of the inherent resonance of a(quartz) crystal to obtain frequency stability.

• 一种发生高频脉冲（通常是方波）的装置，以达到同步和事件定时的目的。大多数是晶体振荡器，它利用（石英）晶体固有共振的优点，所以频率稳定。