查询词典 frequency modulation

The simulation results are given that, the beacon identification function and the direction finding of the radio compass cannot be influenced by DPSK modulation, and the synchronization between DPSK and the audio frequency signal is an effective approach to overcome the AM's influences on the DPSK demodulation.

仿真结果表明，DPSK不会对现有机载无线电罗盘的基本功能产生影响，利用差分数据信号与音频信号进行同步的方法进行"北斗二"差分数据传播可以有效克服AM调制对DPSK解调的影响。

The objective of DC power modulation is to damp the relative swing of angle and frequency of the two areas from COI.

直流输电线路功率调制的目标是阻尼区域COI功角和频率间的相互振荡。

According to optical transfer function, degree of modulation and apperceive degree of space frequency vision vs object image, TIFF grayscale scenograph is made.

根据光学传递函数、调制度和空间频率视觉及对物象的感知程度，制作TIFF格式透视灰度图。

This paper introduces a system solution of modulation domain analyzer and it s principle of meas- uring frequency and time interval.

本文介绍了一种调制域分析仪系统方案及其测量频率与时间间隔的工作原理。

Oscillation modulation circuit which can provide the signal carrier with stable frequency is the key point in the subject.

本课题重点在于设计能给发射机电路提供稳定频率的振荡调制电路。

It proposes an improved Dynamic Frequency Selection scheme, in which traffic allocation unit and scheduling information delivery are selected by subchannel domain, modulation and coding domain, subcarrier domain.

提出了一种优化的动态频率选择方案，该方案是对资源分配单元和调度信息传递在子信道域、调制编码域和子载波域的三维选择。

In radio communications, a frequency in a superheterodyne receiver or transmitter system that enables easier filtering, distribution, modulation, and demodulation of a signal

在无线电通信技术中，超外差接收机或发送机系统中使用的一种频率，能够方便地对信号进行滤波、分配、调制和解调。

The system directly uses the frequency conversion velocity modulation way automatic control the speed of water pump motor, has saved the system investment.

系统直接采用变频调速方式自动调节水泵电机的速度，节省了系统投资。

These results indicate that the brain endogenous opioid system seems to play a major role in the modulation of the micturition threshold and the frequency, whereas in the spinal region, enkephalinergic neurons seem to control the activity of sacral preganglionic neurons.

这些结果显示，脑部之内吗啡系统的抑制作用，主要和排尿反射阂值之调控有关，而脊髓部位的内吗啡系统则可直接对副交感神经节前神经元造成抑制性作用。

ATbstract: he small frequency modulated transmitter, the power is small, may launch the wireless signal, accepts the signal with the radio, satisfies certain transmission range, Circuit easy system, low cost, power output does not exceed 5-8 mW, firing range to be in the housing area of about 100 meters, with an ordinary FM radio receivers, demonstrating his superb sensitivity and clarity, the most circuit design challenges of the part is only used 3 V power supply, and half-wave antenna will be such a launch capability.simultaneously can input the sound signal, may install modulation surveillance table to serve as the monitoring device, although the power is not very big, but should the interference protection normal radiobroadcasting signal.

小型调频发射机，功率小，可以发射无线信号，用收音机接受信号，满足一定的发射距离。电路简单易制，造价低廉，输出功率不超过5－8mW，发射范围在房屋区可至100米左右，用一部普通的FM收音机接收，显示其灵敏度和清晰度俱佳，电路设计中最富挑战性的部份就是只需用3V电源和半波天线便有如此的发射能力。同时能够输入声音信号，可安装调制监视表头用作监视器，虽然功率不是很大，但是应该防止干扰正常的无线广播信号。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。