查询词典 pulse-code modulation

An overmodulation algorithm for space vector pulse width modulation suitable for current source converters is proposed.

提出一种适用于电流型变流器(current source conver- ters， CSC)的空间矢量过调制策略。

By a voltage-traced SPWM technology, the sine pulse width modulation wave was derived and the project of voltage output was designed. Resultantly, the microcontroller was fully used in the variable-frequency power system.

讨论了系统的硬件、软件设计和正弦脉宽调制波的生成和输出稳压方案的设计，采用了实时电压跟踪SPWM技术，使单片机在变频电源系统中得到了有效的应用。

Pulse width modulation is also exploited in sound synthesis, especially subtractive synthesis, as the process gives a chorus effect or that of slightly detuned oscillators played together.

脉宽调制也是利用声音合成，尤其是减法合成，随着这一进程提供了合唱效果还是略失谐振荡器共同出战。

Space vector pulse-width modulation control strategies were proposed for three level inverters of traction drives in high-speed EMUs.

提出了适用于高速动车组牵引传动中三电平逆变器控制的空间矢量脉宽调制控制策略。

High frequency pulse width modulation power control systems can be realized using semiconductor switches.

高频脉冲宽度调制电力控制系统，可以实现用半导体开关。

The use of the current world's most advanced IGBT and high frequency sine wave pulse width modulation, dual-inverter technology.

采用了目前国际上最先进的IGBT及高频正弦波脉宽调制、双逆变技术。

A symbol synchronization method for digital communication is proposed, and it is a indirectly inserted pilot frequency based on pulse width modulation.

提出了一种用于数字通信的位同步方法，它是基于脉宽调制技术的间接插入导频法。

The average current in every phase is obtained by means of Pulse Width Modulation, frorn which becomes the composed vector, and the driving on fractional step angle of stepmotor can be realized.

从而构成合成矢量，实现分数步进角的驱动。实验结果表明，其转角精度高于任何数字编码器的分辨率，极大地提高了步进电机的伺服精度。

Based on these, the single phase converter system is studied in detail, including the selection of the main circuit scheme, the formation of Sine-wave Pulse- width Modulation signal, the design of the drive and protection circuit of IGBT, and the design of high frequency transformer. Finally, the simulation software is employed to test the effect. And the result is satisfactory.

在此基础上，本文主要对电能质量控制稳定器所需的DC/AC控制电源进行了详细研究，包括主电路方案的选择、SPWM波的生成、IGBT的驱动和保护电路、高频变压器的设计以及闭环电压控制原理，最后进行了输出电压的计算机仿真分析，结果是令人满意的。

Based on the voltage pulse width modulation control strategy with single transistor chopped, the behavior patterns of chopping current and freewheeling current were analyzed under the single phase faults of power converter.

基于电压脉宽调制斩单管控制策略，分析变换器单相功率管故障情况下，斩波电流和续流电流的故障表现。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。