under modulation

The output voltage waveforms of matrix converter which is based on the space vector modulation are analysed under the unbalanced input voltage. A time variant modulation ratio method is proposed.

在非对称输入电压情况下，对基于双空间矢量调制的矩阵变换器的输出电压波形进行了分析，提出了利用时变调制比改善输出电压波形的方法。

By optimizing the mapping scheme between source and channel modulation symbols in a joint source-channel coding/ modulation system, under the distortion measurement of end-to-end mean square error, the proposed scheme has better performance than that of the traditional tandem coding system.

在信源-信道联合编码/调制中，通过优化信源和信道调制符号间的映射关系，在端到端均方误差的失真度量标准下，可以得到比传统级联编码系统更好的性能。

This paper simulates and analyses the torque pulsation because of the modulation frequency and speed variation under ambipolar pulse width modulation;

本文对双极性调制的无刷直流电动机仿真，分析了转速和调制频率对转矩影响；

On this basis, the scheme of digital double closed-loop modulation demodulation with four-state-bias was brought forward, and the process of modulation demodulation under some different conditions were studied, and gave the modulate-demodulate equations.

在此基础上提出了基于四状态偏置的数字双闭环调制解调方案，分别研究了几种不同条件下的调制解调过程，并给出了调制解调方程。

This dissertation focuses on the modulation and equalization under acoustic channel.

本文重点探讨了水声信道下的调制技术和均衡技术.

Live cells were observed under inverted microscope equipped with Hoffman modulation contrast optics, and classified according to their morphology. Chromogenic in situ hybridization ( CISH) using chromosome 17 centromere probe and anti-c-kit immunocytochemistry staining were applied to classified cell smears.

在Hoffman光学镜头下根据细胞形态进行活细胞分类，选取各类细胞分别涂片，行17号染色体着丝粒探针化学显色原位杂交和c-kit抗原表达免疫细胞化学染色。