查询词典 modulation

The chromatic dispersion performance of the 120Gbit／s ODPASK modulation format is investigated in the single channel system.

研究了单信道系统中120Gbit／s 八进制差分相位幅度调制格式的色散性能。

The basic information consists of luminance information and chrominance difference signals. During the composition into one signal, the chrominance signals can interfere with the luminance. Therefore, the television technique has to adopt appropriate modulation methods to eliminate the interference between luminance and chrominance signals.

基本信息由亮度信息色差信号组成，由于在合成中，色度信号可能会干扰亮度信号，因此，还要采用适当方法消除色度信号和亮度信号之间的干扰。

Later, it makes some comparison with four kinds of modulation technique, and finally, it implements the three-level PWM switching power amplifier with the PWM technique. The power of the amplifier is 2kVA, and the frequency bandwidth is 10～3kHz. In the thesis, the author designs and makes the hardwares of the switching power amplifier. The hardwares contain power inverter rank circuit, control system circuit based on DSP, drive and isolation circuit, and protective circuit. The thesis also analyses the potential safety problems and put forward some solutions for the problems. Furthermore, the thesis accomplishes the software design of the control system, and successfully debugs it. The methods of designing higher power ampilfier are also discussed in the thesis. It analyses the feasibility of the methods, outlines the way of how to design higher power switching power amplifier, and does some experiments with the method of switches-parallelling.

根据电动振动试验系统对开关功放的要求，提出了以电感电流瞬时值控制技术为基础的三电平脉宽调制开关功放的设计方案，并通过系统仿真进行了原理性论证；然后设计并制作了开关功放的硬件，包括功率转换电路，基于DSP的控制电路，驱动、隔离电路以及保护电路；针对开关功放数学模型不易得出的特点，细致分析了模糊自适应PID控制方法，在此基础上编写了控制程序；研制出一台功率为2kVA，通频带为10～3kHz的三电平脉宽调制开关功放；论文中还探讨了实现大功率开关功放的方法，分析了各种方法的可行性，给出了实现大功率开关功放的思路，并进行了并联开关管实现大功率开关功放的实验。

This method estimates Doppler frequency by eliminating PN code two-phase modulation effect, then gains code phase estimation by circular correlation.

该方法利用伪码二相调制特性，通过乘法消除伪码影响，得到多普勒估计值，在此基础上运用圆周相关法得到的伪码相位估计值。

The Photoelastic Modulation Ellipsometer is used to measure an artificial circular polarizer, which is a combination of a linear polarizer and a retarder.

在本论文中选用了商业圆偏光片为样品，圆偏光片是由具双折射的1/4λ补波片及线性偏极片两种材料组成。

Shannon yogurt in accordance with international fruit flavors modulation and that succeed,Pure fruity,Taste fresh and smooth,cleanlily amenity.

香浓酸奶按照国际流行水果口味精心调制而成，果香纯正，口感清新幼滑，清爽宜人。

This proposed modulation algorithm has simple format and clear physical concept, in addition, it's easy for the digital implementation.

所提出的调制算法，形式简单，物理概念明确，易于数字化实现。

Digital signal processor; space-voltage vector pulse width modulation; pressure closed-loop control system

数字信号处理器；电压空间矢量脉宽调制；压力闭环控制系统

There is a picture/sound separated filter in the color television modulation and demodulation bay of microwave communication system.

在微波通信系统中的彩色电视调制、解调机架上，有一图像、伴音分路滤波器。

Inverter ; pulse width modulation/common-mode voltage ; control strategy

逆变器；脉宽调制/共模电压；控制策略

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化，采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。