查询词典 pulse-time modulation

The performance of 2-level pulse amplitude modulation and analogue pulse width modulation system based on self-error-correction code was analyzed.

基于自纠错码的二级脉冲幅度调制与脉冲宽度调制光纤传输技术，对系统中的接收机灵敏度进行了分析。

"There are two different modulation methods commonly used to do this: pulse-code modulation, which is widely used for transmission in common-carrier communications; and delta modulation, which is finding broad application in military communications."

完成这一转换通常有两种调制方法：脉码调制，这种调制方法广泛用于普通通信传输中；增量调制，这种调制方法在军事通信中使用较多。

The composition voltage, the electric current double closed loop voltage-stabilized source, used the integrated phase shifting crystal thyratron module to do for the electrical energy transformation component, in detail has calculated the rectification main circuit main component parameter; In the pulse-duration modulation part, used the special-purpose integrated circuit to realize the frequency modulation to adjust the pressure, did take IGBT as the power transformation component, realized the output voltage frequency modulation to adjust the pressure, and has calculated the related parameter.

在调压稳压电压源设计中采用二阶工程设计法设计了电压和电流调节器，组成电压、电流双闭环稳压电源，采用集成移相晶闸管模块做为电能变换器件，详细计算了整流主电路主要器件的参数；在脉宽调制部分，采用专用集成电路实现了调频调压，以 IGBT 做为功率变换器件，实现了输出电压的调频调压，并计算了有关参数。

To eliminate common-mode voltage of cascaded multi-level inverter, three kinds of phase-difference SVM based on left and right bridge vectors are proposed firstly. From these three modulations, equivalent SPWM components are deduced, and the unipolarity and bipolarity of output waveforms are analyzed. 2π/3 PD-SVM (phase-difference space vector modulation) is testified be unipolar.

为消除级联型多电平逆变器的输出共模电压，首先提出了基于左、右桥臂矢量的三类相差空间矢量调制(space vector modulation，SVM)技术，数学推导出三类调制技术的等效正弦脉宽调制(sine pulse width modulation，SPWM)的调制波，并分析了其各自相电压输出波形的单、双极性，证明2π/3相差SVM必为单极性调制。

The amount of pulse width modulation pulse generators of the proposed modulation strategy is only the half of that of the traditional modulation strategy, which is of significant theoretical and practical value for the digital implementation of cascade multilevel converter.

该策略较传统的载波相移SPWM可以节省一半的脉宽调制(pulse width modulation，PWM)脉冲发生器，对级联型多电平逆变器的数字化实现有重要的理论和实用价值。

An asynchronous coupling method is proposed to reduce the walkoff effect, and the results show that asynchronously coupling of the bright pulse with the dark soliton can efficiently improve the bright pulse compression relative to the synchronous coupling method.

还发现，若采取本文提出的非同步耦合法，则可以明显地弥补离散效应对脉冲压缩的影响，从而有效地改善脉冲压缩效果。标签脉冲离散交叉相位调制脉冲压缩非同步耦合 pulse walkoff cross phase modulation pulse compression asynchronous coupling

The mathematical model and working modes of a novel three-phase two-arm three-level neutral-point-clamped pulse width modulation rectifier suitable for direct-driving wind power system are analyzed in detail, and the constant frequency control strategies based on space voltage vectors are proposed and applied to the rectification conversion of direct-driven power generation system.

系统分析了新型三相两桥臂三电平中性点箝位脉宽调制(pulse width modulation，PWM)整流器的数学模型和工作模式，提出了基于空间电压矢量的恒频控制策略，并将其应用于直驱风力发电系统整流变换中。

Switching Power Supply has three kinds of control circuits: Pulse Width Modulation, Pulse Frequency Modulation, Pulse Width and Frequency Modulation.

开关电源有三种控制方式：脉冲宽度调制、脉冲频率调制、脉冲宽度频率调制。

This paper discusses the pulse-width modulation switch sequence of arbitrary-number-level inverters, and proposes a switch sequence with loss balance of power electronic devices.

讨论任意电平逆变器脉宽调制(pulse-width modulation，PWM)序列，提出一种电力电子器件损耗均匀分配的序列方式。

This controller integrates pulse width modulation and pulse density modulation together,and can easily change between the two modulations.

该设计集成了脉冲宽度调制和脉冲密度调制两种调制方式，并可以在两者间切换。

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。