查询词典 frequency modulation

It may appear as a high frequency audio "tizz" coinciding with modulation peaks from the adjacent station.

它也许出现作为一高频率音像&tizz&相符与模块化峰顶从毗邻驻地。

Based on these, the single phase converter system is studied in detail, including the selection of the main circuit scheme, the formation of Sine-wave Pulse- width Modulation signal, the design of the drive and protection circuit of IGBT, and the design of high frequency transformer. Finally, the simulation software is employed to test the effect. And the result is satisfactory.

在此基础上，本文主要对电能质量控制稳定器所需的DC/AC控制电源进行了详细研究，包括主电路方案的选择、SPWM波的生成、IGBT的驱动和保护电路、高频变压器的设计以及闭环电压控制原理，最后进行了输出电压的计算机仿真分析，结果是令人满意的。

The analysis of 3D noise indicates that the measurement is effective. Two MRC models of ICCD imaging system has been established based on system performance of energy and modulation transfer whose target is three-bar. One MRC model is under the condition of standard A lamp, and the other is under the condition of night photo-spectrum. Because the MRC models integrate sensitivity, noise, target spatial frequency, MTF and the performance of human eye all together, the MRC models can evaluate limit performance of photoelectric imaging system more roundly.

在系统能量传递特性和调制传递特性的基础上，以三条带图案为研究对象，从信号转换的角度出发，围绕每景象立体弧度角中ICCD的电子通量，建立了基于量子噪声和CCD噪声特性的微光ICCD成像系统MRC模型，MRC模型综合了系统灵敏度和噪声、目标空间频率、系统调制传递特性以及人眼视觉特性等因素，能更全面地反映光电成像系统的极限性能。

The key technologies of novel photoelectron elements to support RoF are optical generations and receivers technologies for millimeter wave subcarrier, including external modulator method, radio frequency up-conversion method, self-heterodyne method, generator of optical pulse self-modulation, and so on.

近年来，支撑RoF技术的新型光电子器件的关键技术有毫米波副载波光学产生技术和接收技术，其中包括外调制器方法、射频上转换法、光学外差法、毫米波调制光脉冲发生器等等。

The packet clock then goes into SOA to reduce the low-frequency amplitude noise and temporal fluctuation with the self-gain modulation effect of SOA.

利用半导体光放大器的自增益调制效应对组合滤波器提取的帧时钟进行整形，降低帧时钟的幅度噪声和时间抖动。

The extrema of the seismic data are used to get the modulation function which operated with the original seismic data to get the high frequency part of the reconstruction data to rebuild the wide band data.

该方法利用地震资料极值点得到的调制函数通过与原地震资料的运算得到重建资料的高频部分，保留原地震资料的低频部分，得到重建的高频地震资料。

With the help of linear method, we discussed the frequency ranges in space and time when the modulation instabilities can happen.

在平面波理想情况下，用线性分析法讨论了调制非稳性可能发生的空间、时间频率范围。

A form of modulation in which signals are pulsed directly on the transmission medium without frequency division.

基带 一种调制方式，信号在传输媒介上直接进行调制而不需要频率分解。

An alternative method is to transmit the combined digital signal from the parallel channels by frequency or phase modulation of common carrier.

另一种方法是对公共载波调频或调相的方法发送并列信道的组合数字信号。

In order to solve this problem, a method is proposed to orthogonalize the non-orthogonal basis composed by non-orthogonal pulses. Applying this method in modulation, a time-frequency joint interpolation filtering scheme called ORTH is obtained.

针对这一问题，本文提出将非正交脉冲所构成的非正交基进行正交化，并应用于调制系统，从而得到了一种时频域联合内插滤波的结构，称为ORTH。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。