查询词典 modulation

The analysis of simulation result indicates that the CDMA system has much more superior performance on noise-immune; the continuous processing in the part of signal modulation can not improve the efficiency of spectrum in CDMA system; under the situation , making sure that the proximity of the reliability of information transmission to the unsmoothed system, the power of the transmission can decline to 90.5% of the unsmoothed system, the bandwidth of -50dB will decline to almost one half of the unsmoothed system in spread spectrum and dispread spectrum by using continuous WALSH codes.

仿真及分析结果表明：CDMA系统具有更优越的抗噪声性能；信息调制部分的平滑化处理在CDMA系统中不会改善频谱的利用效率；运用平滑化WALSH码进行扩频和解扩时，在保证信息传输可靠性与非平滑化系统接近的情况下，能够将发射功率降低到非平滑化系统的90.5%，-50dB带宽减小到非平滑化系统的一半左右，这有利于降低对临近频段的干扰，提高频谱的利用效率。

Second, a robust digital watermark algorithm based on difference dither modulation is proposed.

其次，提出了一种基于差值抖动调制的鲁棒数字水印算法。

By using the numerical calculation results of the density matrix equations of motion of a closed Λ-type inversionless lasing system, the effects of the propagation of light fields on the gain of lasing without inversion, Rabi frequencies of the probe and driving fields, and the modulation role of spontaneously generated coherence on the effects were investigated when the Doppler broadening presents.

利用封闭Λ型三能级无粒子数反转激光系统密度矩阵运动方程的数值解，研究了存在Doppler展宽的情况下光场的传播对LWI增益、探测场和驱动场Rabi频率产生的影响以及有自发辐射诱导相干对这个影响的调制作用。

Using two-dimensional signal vectors, the process of Doppler shift modulation and demodulation ...

文中从二维信号矢量的角度分析了多普勒频移调制和解调的过程，推导出提取速度信息的信号处理方法。

Object surface points of the wavefront reference beam mirror movement modulation double - exposure holographic displacement measurement of the direction of the object theory and method.

研究物面分波前反射镜运动调制参考光双曝光全息测量物体位移方向的理论与方法。

In this paper, a general method for modeling the conductive electromagnetic interference sources of pulsewidth modulation inverters is presented based on the principle of the double Fourier integral.

基于双重傅里叶积分方法研究了三相PWM 逆变器传导干扰源的建模方法。

In the case of double line spectrum, modulation ratio changes as a periodic function of light-path difference with the period of λ〓/△λ.

在有一定宽度的谱线情况下，调制比随光程差的增加而衰减，因而存在一个最大光程差λ〓/△λ。

In the first time upsurge of multimedia, if you have times doubler fast CD driver and sound of frequency modulation complex get stuck, perfectly.

在多媒体的第一次热潮中，假如你拥有一台双倍速的光盘驱动器及调频合成的声音卡，就相当不错了。

According to the characteristic of the reverse range shift induced by the upslope and downslope of triangular FMCW modulation, the upslope and downslope are imaged, respectively.

调频连续波雷达的低发射功率使其具有低截获、隐蔽性好、抗反辐射导弹能力强的特点。

The topology of two-stage matrix converter given based on the concept of fictitious DC link of matrix converter and dual space vector modulation strategy of TSMC was studied.

在矩阵变换器虚拟直流环节的思想上，给出了双级矩阵变换器的电路拓扑，仿真研究了双级矩阵变换器的双空间矢量调制策略。

For the head-teacher of the class said that I had seriously broken the school rules,which led me to a three-day suspend class.

为什么呢？因为我的班主任说我严重的违反了校规，于是让我停课三天。

Many of them believe that the conversion of thousands of working-class folk in England spared that nation from the mass carnage and the tyranny that came with the revolution in France.

他们之中有许多人相信，在英国数以千计的劳工阶级之悔改信主使英国免於遭受如法国大革命所造成的大屠杀和专制暴政。