介绍了基于正弦波和方波调制的高压放大器的不同工作原理，并对其出力系数进行了推导。
The paper presented the theory of sine-wave and square-wave modulated high-voltage amplifier and deduced the formula for calculating its efficiency.
文章提出了一种改进型正弦波脉宽调制(SPWM)对称规则算法。
In this paper, the Sine Pulse Width Modulation (SPWM) technology is investigated, and an improved SPWM algorithm is presented.
通过使用一个周期的正弦波曲线模型的滑动拟合法，实现了正弦载波相位调制信号波形的精确解调。
By using moving one period sine wave model, the precise demodulation of PM signal wave is achieved.
而SPWM（正弦波脉宽调制）波的产生和控制则是变频技术的核心之一。
The generating and controll of Sinusoidal Pulse-Width Modulation (SPWM) waveforms is one of the core technology of frequency conversion.
调制的方法主要是通过改变正弦波的幅度、相位和频率来传送信息。
Modulation methods primarily through changes in the rate of sine wave, phase and frequency to transmit information.
本文介绍了采用新的脉宽调制原理和微电脑技术，研制出的25赫正弦波铃流源。
In this paper, using a new principle of PWM and the teehnique of storage system in a microcomputer are deseribed, and a 25Hz sinusidal bell current source has been developed.
相对于等宽脉宽调制PWM，正弦波脉宽调制SPWM可以有效地降低电动机的损耗和噪声。
The Sine wave Pulse Width Modulation (SPWM) is used to reduce the wastage and the noise of the motor more effectively, as comparing to the equal pulse width modulated PWM.
我们的分析结果还指出这种多重单频正弦波泵浦相位调制技术更加适合于将来的高比特速率系统。
Our simulation results also show that these multi-tone pump phase modulation techniques are more appropriate for the future high bit rate systems.
常用的调制方式使用正弦波作为载波并对其进行幅度调制(AM)和角度调制即调频(FM)或调相(PM)。
In frequently used methods, sine wave is used as carrier with amplitude modulation (am), frequency modulation (FM) and phase modulation (PM) implied.
实验结果证明，系统电动机电流的谐波失真较小，直流母线电压利用率比常规的正弦波脉宽调制（SPWM）有了较大的提高，功率器件的开关损耗较小。
Test results proved that the motor had lower current harmonic, more efficient use of DC supply voltage than SPWM, less switch loss of power switch.
本文在分析了几种SPWM调制方法的基础上，将基于对称采样法的SPWM调制算法应用于本设计中，产生了可调频调幅的正弦波脉宽调制信号。
The SPWM algorithm using symmetrical sample in this controller, can alter its frequency and amplitude. The good performance of the BLDC Motor controller using DSP is verified by the experiment.
本文在分析了几种SPWM调制方法的基础上，将基于对称采样法的SPWM调制算法应用于本设计中，产生了可调频调幅的正弦波脉宽调制信号。
The SPWM algorithm using symmetrical sample in this controller, can alter its frequency and amplitude. The good performance of the BLDC Motor controller using DSP is verified by the experiment.
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