查询词典 modulation

A low in-band phase noise FM frequency synthesizer has been depicted in this paper. It bases on the fraction N PLL frequency synthesizer, and the THD of the system has been improved greatly by this closed loop modulation mode.

研制一种低带内相位噪声的立体声FM频率合成器，该合成器基于小数分频锁相环技术，利用闭环方式对载波信号进行调制，显著提高系统的THD。

Here a tracing of differential optic phase is presented and sin modulation is adopted in the method, triangular operator is applied and finally the rotation signal is gotten after multipling on FOG output and the tracing signal, and adding filters to where they are needed.

提出了一种单通道光相位差跟踪的方法。这种方法采用正弦调制，通过对信号(包括输出信号和跟踪信号)的三角和乘法运算，并在必要的环节进行滤波得到光相位差。

In young human umbilical vein endothelial cells, human aortic endothelial cells, and human coronary artery endothelial cells, miR-217 induces a premature senescence-like phenotype and leads to an impairment in angiogenesis via inhibition of SirT1 and modulation of FoxO1 (forkhead box O1) and endothelial nitric oxide synthase acetylation.

在婴儿脐静脉内皮细胞、人类主动脉内皮细胞以及冠状动脉内皮细胞中，miR-217可以诱导这些细胞出现一种早衰样表型，进而通过抑制SirT1的表达、调控Fox01以及内皮细胞一氧化氮合酶的乙酰化来损伤新生血管的形成。

The frequency changer velocity modulation technology is technology and so on collection automatic control, micro electron, electric power electron, correspondence to a body high tech technology.

摘要变频器调速技术是集自动控制、微电子、电力电子、通信等技术于一体的高科技技术。

The high efficiency transistor development causes the frequency changer the construction cost more and more to be also low, from the cost and the performance considered selects PLC to the frequency changer control realization frequency conversion velocity modulation.

大功率晶体管的开发使变频器的造价也越来越低，从成本和性能考虑选用PLC对变频器控制实现变频调速。

The most pioneer work in this dissertation is the study of frequency modulation of light.

本论文最具有开创性的工作是对光路频率调制的研究。

It's possible to complete the absolute distance measurement by using linear frequency modulation of semiconductor laser.

高精度的绝对大长度测量问题在工业生产中是一个急需解决的问题。

An improved PID control strategy is used and the method of mixed frequency modulation is put forward.

采用改进的PID控制策略，提出了混合频率调制法，设计了相应的控制电路。

Therefore, the tuner is essential to the frequency modulation radio.

所以调频收音机中的频率调谐器是至关重要的。

This paper mainly discusses the design problems of broadband frequency modulation circuits based on PLL.

本文主要讨论了基于锁相环的宽带调频电路的设计问题。

"The operators will suffer a temporary decrease in the number of consumers and short message services as people may not like having to provide their ID cards for a phone number," Xu Junqi, vice-dean with the Policy-Making Institute of the Telecommunications Research Centre under MII, said yesterday.

信息产业部下属的通信决策研究院副主任徐俊其昨天说：&实行手机实名制后，人们可能不太情愿用身份证注册手机号，所以通信运营商会暂时面临用户减少和短信用户减少的问题。&

I don't believe in make-believe!

我不相信这些虚构的故事。