Based on the introduction of components and principle of work of frequencymodulationsystem of constant frequency AC power supply, math model of frequencymodulationsystem is established.
在介绍某型恒频交流电源频率调节系统的组成和工作原理的基础上，建立频率调节系统的数学模型。
2
In the model communications system, the modulation process also is loaded the digital signal in the carrier scope value, the carrier frequency or on the carrier phase.
在典型的通信系统中，调制过程是数字信号加载在载波的幅度值、载波的频率或者载波的相位上。
3
This paper studied the three-phase PWM(pulse width modulation) rectifier in dual PWM variable frequency speed regulation system.