查询词典 band filter

There are low-pass filter and high-pass filter, band-pass, band-stop.

有低通滤波器和高通滤波器，带通，带阻。

Abstraction :This paper analyzes the principle of Butterworth digital filter,discuss bilinear transformation method of filter design;record a piece of voice by Microsoft voice recorders, carry on its a time-domain analysis, spectral analysis;then design a specified Butterworth band-stop filter based on the theory of bilinear transform,analyze the filter by the tool named Fvtool;and filter the voice signal acquired by voice recorder.finally compare its characteristics of frequency domain and time domain,study the applications of Butterworth filter in digital signal processing ,in particular in signal denoising.

本文分析了巴特沃思数字滤波器的原理，探讨了双线性变换法设计滤波器的方法；用微软录音机采集一段语音，对其进行了时域分析，频谱分析；然后使用双线性变换法设计了一个的巴特沃思带阻滤波器，并且使用fvtool对设计的滤波器进行分析；然后利用该滤波器对采集的语音信号进行滤波。最后对比滤波前后的语音信号的时域和频域特性，研究了巴特沃思滤波器在信号处理尤其是信号滤波去噪方面的特性和应用。

The excellent agreements between simulated and measured results prove the accuracy of the established circuit model. Moreover, the varactor was added to the resonator to adjust its resonant frequency. As expected, the reactance introduced by the varactor indeed affects the net inductance and capacitance obviously. It is noted that, not only the shift with the center frequency, the inductive or capacitive of the reactance can also provide a parameter to switch its frequency toward the two directions away from the one without varactor. As a consequence, a wideband tunable band-pass filter is achieved. Although the bad quality factor with the diode strongly increases the insertion loss, this concept was proved to be available for effectively tuning the center frequency of such a class of band-pass filter.

另外，在共振器上的varactor是用来调整共振器的共振频率，如预期的，由varactor所造成的电抗确实的影响到共振器的总电感和电容值，值得一提的是，不仅滤波器的中心频率可以被改变，这电抗是电感性或是电容性也将决定滤波器的中心频率将大於或小於未加varactor时滤波器的中心频率，利用这个结果，我们也实现了一个宽的可调频率带通滤波器，虽然不理想之二极体的Q值增加了滤波器的介入损失，但这原理是被证明可有效的用於调变带通滤波器的中心频率。

A compact and excellent band pass filter with 1.8 GHz center frequency and 250 MHz band pass was designed,which had one attenuation-pole on the high and low stop band respectively.The dimension of the filter was 2.0 mm×1.2 mm×0.9 mm,fitting for ...

实现了一个中心频率在1.8 GHz，带宽为250 MHz，且在高低禁带端各有一个衰减极点的优良小型化带通滤波器，其外形尺寸为2.0 mm×1.2 mm×0.9 mm，满足0805型号封装要求。

The application of imitation for broad band digital seismic recording;2. The article introduces the design of the broad band EMI filter connector,with the em- phasis on the principle and the structure of the filter.

文中介绍了一种用于宽频带低通EMI滤波连接器的设计，重点描述了该滤波器的滤波原理和结构设计，并对滤波插针的有关参数进行了理论计算以及仿真。

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与audioedit豪华您可以执行双程转换之间的CD ， MP3等， mp2 ， wav ，的WMA ，和OGG ；打开，创建和保存音频文件中的任何支持的格式（也可以保存的任何部分，加载文件到磁盘作为一个新的文件）；显示音频数据的波形（放大充分，放大，缩小，缩小垂直）；播放音频文件或任何部分的文件；记录音频数据从一个麦克风或任何其他可输入设备；编辑音频文件的视觉（剪切，复制，删除选择，剪裁，修剪，粘贴，粘贴文件，混音，混音，从文件）；适用於各种效果（放大，压缩，延时，均衡，淡出在和淡出，镶边，反转，正常化，相位，混响，扭转，收缩，沉默，舒展，颤音）；适用於不同的过滤器，以任何选定的部分音频文件（带通滤波器，高通滤波器，高货架过滤器，低通滤波器，低大陆架滤波器，陷波器）；插入噪音或沉默到音频文件；插入信息转化为音频文件（专辑名称，艺人，版权，流派，标题，年）；完整的，多层次，撤消和重做的能力；先进，烧伤证明音频CD烧录；得多。

The strain gradient, the fiber Bragg grating's reflection and the short wavelength loss decide the two stopbands. Because of having no extra loss result from coupler and no high cost result from circuitor, the band pass filter formed by single chirped fiber grating have many good characters such as little insert loss its insert loss is the fiber splice loss, small volume, low cost and excellent property, moreover there is no report about fabricating filter by using this method, thus we will apply national invent paten about the method of fabrication fiber band pass filter using single chirped fiber grating. According to the parameters linearly chirped fiber gratings of Canada BRAGG Photonics Inc.

由于没有耦合器带来的3dB的额外损耗，也没有环行器带来的高的制作成本，用单支chirped光纤光栅形成可调光纤带通滤波器具有插入损耗极小（插入损耗为光纤与光纤之间的融接损耗）、体积小、制作成本低廉并且性能优良等特点，而且国内外还未见类似制作方法的报道，我们对用单支chirped光纤光栅形成可调光纤带通滤波器这一制作方法正在申请国家发明专利。

This character of the photonic crystal containing defect can be used to enhance spontaneous emission of atoms and to make narrow band filter.

为了能对光子晶体进行数值计算，人们一直不遗余力的在寻求新的计算方法。

The main work and achievements are as following: 1 Proposed the approach to design the false high-passed broad band filter.

主要工作和成果如下：1、赝高通宽带带状线滤波器的设计。

Based on the introduction it explores into the designing of the broad band filter and the super miniature of local oscillator source.

在此基础上提出了本文课题的重要意义，主要对收发信机中宽带滤波器进行设计和探讨、本振源超小型化。

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。