字频率 meaning in Chinese

word frequency

Standard test method for impedance and absorption of acoustical materials using a tube , two microphones , and a digital frequency analysis system
管子双扩音器和数字频率分析系统用传声材料的阻抗和吸收的试验方法
The core of the lock - in amplifier used to measure response of laps consists of a high precision modulator / demodulator and dds as signal generator
对于光寻址电位传感器，我们设计了以高精度调制解调器件和数字频率合成器件为核心的模拟锁相放大器。
It discusses some kinds of basic frequency synthesis technology such as direct , phase - lock , digital and direct digital frequency synthesis , then give the performance index of the frequency synthesis , and discusses the digital frequency synthesis technology in detail
讨论了直接式频率技术、锁相式频率合成技术、数字式频率合成技术、直接数字频率合成技术等几种基本频率合成技术，给出的衡量频率合成技术的各种性能指标，并对全数字频率合成技术作了较详细的讨论。