查询词典 modulation

The application of trellis coded modulation to spread spectrum multiple access system has been an attractive research subject recently.

近年来网格编码调制技术在扩频多址系统中的应用已成为一个富有吸引力的研究课题。

An efficient algorithm is presented for computing free distance of trellis coded modulation and is illustrated by computational results.

提出了计算卷积码自由距离的快速算法，得到了一些系统码自由距离的准确值，并对快检码给出了很紧的自由距离上界。

Select from three types of modulation waveforms for the tremolo.

选择从三种类型的调制波形为颤音。

To satisfy the requirement of different users, a three-phase four-leg circuit topology inverter is investigated to balance output voltage. The transfer functions and system transfer functions matrix are deduced. Three-dimensional space voltage vector modulation strategy is analyzed. The triangular prism judgment, the tetrahedron discrimination and computational methods of space vector action time are discussed.

推导了三相四桥臂逆变器的传递函数，建立了系统传递函数矩阵；分析了三维空间电压矢量调制策略，给出了三棱柱判断、四面体的区分、各个空间矢量作用时间的计算方法，并进行了仿真和实验研究。

Subsets of noise are AC power-related hum and buzz, electronic crackling, vinyl record clicks and pops, between-station radio noises, tape modulation noise, and the triboelectric cable effect.

噪音可分为交流电源产生的嗡嗡声、电器开关弹开声、塑胶磁带咔哒声、台间无线电噪音、调制磁带时的噪音、摩擦电效应噪音等几个不同的组。

Use the R1 trimmer to adjust the modulation to the desired level.

使用R1的微调，以调整调制到所期望的水平。

In order to effectively reduce the effects of multi-access interference on the performance of optical code division multiple access communication systems with intensity modulation and direct detection,according to group information, a novel kind of multi-access interference cancellation scheme based on fiber Bragg gratingused with two dimensional address code MPC/OOC is presented.

摘要在强度调制、直接探测的光码分多址通信系统中，为了有效克服并发用户数之间的多址干扰，提高系统的通信性能，根据组信息，针对由光正交码和修正素数码构成的扩时/跳频地址码MPC/OOC，提出一种基于光纤布拉格光栅的多址干扰消除方案，并详细分析了采用这种多址干扰消除方案的光CDMA通信系统的性能。

Buck and Boost topology switching power conversion circuits as the core of this system, ultra low power MSP430F1222 microcontroller-based controller, microcontroller produced by the PWM pulse width modulation signals, respectively, two-way control switch voltage conversion circuit the turn-on and turn-off in order to achieve the above two kinds of topology switching power conversion circuit, and then to draw power from the flow of electrical energy has been filled into the rechargeable battery, and using microcontroller A / D input voltage implementation of the monitoring, according to the input voltage switching buck - circuit at a lower cost to achieve a highly efficient energy transfer, and the circuit is simple, the parameter to determine easy, self-low power consumption,to achieve full-featured.

本系统以Buck降压和Boost升压拓扑结构开关电源变换电路为核心，以超低功耗单片机MSP430F1222为主控器，由单片机产生PWM脉宽调制信号，分别控制两路电压变换电路中开关管的导通与关断从而实现以上两种拓扑结构开关电源变换电路，进而从一直流电源中吸取电能充入可充电电池，并利用单片机A/D对输入电压实施监测，根据输入电压切换升降压电路，以较低的成本实现了高效率的电能转移，并且电路简单、参数确定容易，自身功耗低，实现功能完整。

The maximum modulation for undistorted operation is that which varies the carrier amplitude between zero and twice its unmodulated value.

最大不失真调制是使载波幅度在O到两倍于未调制值的范围内变动。

To obtain the analytical solution of random response of the structure excited by uniform modulation model is very difficult in general.

均匀调制模型作用的结构随机响应很难给出解析解。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。