1. frequency modulation and control 
   频率调整
2. In pulse code modulation, a spurious signal formed from beats between the signal frequency and the sample frequency. 
   在脉冲编码调制中，信号频率和取样频率之间的差拍所引起的伪信号。
3. a large proton synchrotron; uses frequency modulation of an electric field to accelerate protons. 
   一种大的质子同步加速器；用电域的调频加速质子。
4. An electron tube used to amplify or generate ultrahigh frequency by means of velocity modulation. 
   速调管一种用速度调节的方法放大或产生超高频率的电子管
5. A method of representing data in magnetizable surface storage; for example,"modified frequency modulation". 
   在磁表面存储技术中一种表示数据的方法，例如改进型调频制。

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