频率转换

Through the designed bandpass filter, it can increase the total bandwidth.Moreover, the dual-band bandpass filters are designed by using the impedance ratio of stepped impeedance resonator and meander of transmission Line.

传统上，平行耦合微带线带通滤波器，是两段四分之ㄧ波长传输线等效成一个导纳转器，因为导纳转换器并不具随频率改变的特性，此种仅适合窄频宽时较准确，用在大频宽时，实际的频宽会缩小，经由改善后，可提高频宽。

Proposed DSP engine consists of rectangular to polar converter and digital phase modulator that are designed based on the COordinate Rational DIgital Computer and Direct Digital Frequency Synthesizer algorithm respectively.

所提出来的数位讯号处理引擎包含了座标转换器和数位相位调变器，两者分别是利用数位座标旋转器以及数位频率合成器来实现。

In consideration of human hearing system′s frequency selectivity,the effects of thickness of coupling plate on critical-band level were also explained.

在考虑了人类听觉对频率的选择性接收的前提下，研究了参与耦合的板的厚度对特征频带声强级的影响，讨论了从特征频带声强级到响度的转换过程。

Only oneA/D converter is needed to complete complex quadrature translation and digital downconversion, get in-phase component and quadrature component in digital field, and also,after intra-pulse compression is done, the signal-to-noise ratio is raised, and inter-pulsecompression is done in digital field, and finally, high range resolution profile is got.Two-step stretch processing method for MMW high-resolution RADAR is presented.

计算并优化了毫米波雷达中频信号带通采样的最佳采样频率，应用现有的集成电路技术实现对中频信号的直接采样、用一个A／D转换器在数字域完成复数正交变换，在数字域完成下变频、获得同相信号和正交相信号、完成对子脉冲的脉内压缩、完成对脉内压缩信号的第二次脉间压缩，从而获得高分辨一维距离像。

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。

By a piece of type-II critical phase matching biaxial crystal LBO for extra-cavity and for the compound system of telescope and Lens second-harmonic generation,green laser at 532 nm was achieved with average power of 40.6 mW,pulse duration of 16 ns, and peak power of 181 W.

先采用双凸透镜组合成的望远镜系统对1 063 nm的红外激光进行扩束，再对该光束聚焦，最后经双轴晶体LBO倍频后，得到了平均功率为40.6 mW，脉冲宽度为16 ns，重复频率为14 kHz，峰值功率高达181 W的绿光激光输出，1063 nm→532 nm的转换效率高达58%。

In Im2Ms, the two-dimensional spatial image information is transformed into the temporal music acoustics domain based on artistic conception and human perception among space, color and sound.

在书法可听化的过程中，运用影像分析将二维空间领域的影像资讯转换成时间领域与频率领域的声音资讯。

The bottom plate structure of screen box can be converted in order to improve grading ability.(5) It can adjust vibration frequency of screen boxes productivity and separation rate as needed.

筛箱底板结构可以转换，使分级能力提高；（5）筛箱振动频率可调，生产率和分离率可根据需要进行调节。

In the paper,using three methods,including C language,Matlab and DSP Builder,producing the arbitrary waveform initialization data of the sine wave,the triangular wave,the saw-tooth wave and the square-wave.Programming,parameter setting and waveform simulation are described to every method detailedly.

DDS系统一般包括系统时钟、频率预置与调节电路、相位累加器、ROM查找表，输出的数据通过外接的D/A转换器和滤波器完成波形输出。

SAS Morpheus chokes to ask for the abbreviate of Sleep Apnea Syndrome integratedly. Potential of Satellite Potential satellite namely junior class status, and in order to use late part had better. Saw-tooth Wave toothed wave, dentate wave and dentate report activity are synonymous. Frequency of Samplins Frequency sampling is in the instrument of digitlization report physiology that uses now, the imitate signal that notes draw makes need to undertake sampling when digital changeover.

SAS睡眠窒息综合征sleep apnea syndrome的缩写。satellite potential卫星电位即晚成分，且以用晚成分为好。saw-tooth wave锯齿波，锯齿状波和锯齿状电活动同义。samplins frequency采样频率在现在使用的数字化电生理仪器中，把描记到的模拟信号进行数字转换时需进行采样。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。