... 话频制 voice frequency system 双频制 double frequency system; double-frequency recording; two frequency system; twofold frequency system 四频制 quadruple-frequency system ...
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two-frequency radio system 双频无线电系统
two-frequency repeater system 双频中继系统
two-frequency glide path system 双频下滑道系统
The current measurement and control system in a Low-frequency Magnetic Field is a comprehensive system of hardware and software, including two parts: current measurement and computer control.
低频电磁场电流测控系统包括电流测试和输出控制两个部分，由软件和硬件相互配合组成一个完整的计算机控制系统。
The main reasons to affect the operation frequency of two state hysteresis current regulator for motor control system are analyzed by theory and experiment.
从理论和试验两方面分析了影响电机传动系统中滞环两态电流调节器工作频率的主要因素。
The zero-crossings of the AC voltage and digital frequency synthesizer are used in solving the two main problems in frequency hopping system-synchronization and fast frequency synthesizing.
利用电力系统三相交流电压过零点和高速数字频率合成器解决了跳频系统中同步和快速频率合成的两个关键问题。
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