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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。

Furnace shell by section and steel plate welding full circle tubular, the chamber becomes by the 0.6g/cm3 ultra light quality micro bead energy conservation fireproof brickwork, his/her the endophragm all around even installment heater element, the crucible salt bath's chamber and the furnace shell fills the aluminum silicate textile fiber felt and the inflation heat preservation powder thermal insulation material, in the chamber places the high-temperature steel crucible, uses in the splendid attire salt fluid, the crucible cover by two semicircle constitutions, but rotates nimbly, covers has two holes, supplies the journal to hang the work piece.

炉壳由型钢和钢板焊接成圆筒形，炉膛由0.6g/cm3超轻质微珠节能耐火砖砌成，其内壁四周均匀安装加热元件，坩锅盐浴炉的炉膛与炉壳间填充硅酸铝纤维毡和膨胀保温粉保温材料，炉膛内置放耐热钢坩埚，用于盛装盐液，坩埚盖由两个半圆构成，可灵活转动，盖上有两个孔，供支承轴吊挂工件。

Furnace shell by section and steel plate welding full circle tubular, the chamber becomes by the 0.6g/cm3 ultra lightquality micro bead energy conservation fireproof brickwork, his/her the endophragm all around even installment heater element, the crucible salt bath's chamber and the furnace shell fills the aluminum silicate textile fiber felt and the inflation heat preservation powder thermal insulation material, inthe chamber places the high-temperature steel crucible, uses in the splendid attire salt fluid, the crucible cover by two semicircle constitutions, but rotates nimbly, covers has two holes, supplies the journal to hang the work piece.

炉壳由型钢和钢板焊接成圆筒形，炉膛由0.6g/cm3超轻质微珠节能耐火砖砌成，其内壁四周均匀安装加热元件，坩锅盐浴炉的炉膛与炉壳间填充硅酸铝纤维毡和膨胀保温粉保温材料，炉膛内置放耐热钢坩埚，用于盛装盐液，坩埚盖由两个半圆构成，可灵活转动，盖上有两个孔，供支承轴吊挂工件。

And yet, in Raissa, at every moment there is a child in a window who laughs seeing a dog that has jumped on a shed to bite into a piece of polenta dropped by a stonemason who has shouted from the top of the scaffolding,"Darling, let me dip into it," to a young serving maid who holds up a dish of ragout under the pergola, happy to serve it to the umbrella-maker who is celebrating a successful transaction, a white lace parasol bought to display at the races by a great lady in love with an officer who has smiled at her taking the last jump, happy man, and still happier his horse, flying over the obstacles, seeing a francolin flying in the sky, happy bird freed from its cage by a painter happy at having painted it feather by feather, speckled with red and yellow in the illumination of that page in the volume where the philosopher says:"Also in Raissa, city of sadness, there runs an invisible thread that binds one living being to another for a moment, then unravels, then is stretched again between moving points as it draws new and rapid patterns so that at every second the unhappy city contains a happy city unaware of its own existence."

可是，在莱莎的每一刻钟都听得到窗旁的小孩的笑声，因为他看见一头狗扑上小屋抢吃一块烧饼；烧饼是棚架上的石匠掉下的；他当时正在向一个年轻的女侍应员高声喊叫："好人，让我尝一尝"；那年轻女子正捧着肉汤满心高兴地送给一个庆祝交易成功的制伞工人；爱上青年军官的一位贵妇人在赛马场炫耀她的镶花边的白阳伞；马背上的军官最后一次跳跃时向她笑了一笑；他是个快乐的人，不过他的马比他更快乐，它跳栏的时候看见鹧鸪在天上飞；快乐的鸟儿刚被一位画家放出囚笼；快乐的画家完成了鸟的插图，描出它每一根红黄斑点的羽毛；插图的书页上有哲学家的话："忧愁的城市莱莎也有一根无形的线，在某个顷间把一个生物连系上另一个生物，然后松开，又在两个移动的点之间伸展，快速画出新的图形，因此，不快乐的城市在每一秒钟都包藏着一个快乐的城市，只是它自己并不知道罢了。"

A child hanged to death by a whole night's cold waves Bare, his body has not been Contaminated or filled by dusts Now wholly frozen One night of waiting Is like a century of chaos and loneliness Waiting for the sun to come out And touch him, touch--- Till he slowly and renewedly Turns into water drop by drop Like a candle burned into ashes Inch by inch The stone's aperture Is his end-result Like my hungry and cold childhood Always under mother's eaves Being fed and warmed And now, my heart Like a piece of hailstone Like pieces of hailstone From the hazy sky Falls directly onto the cemented earth 'cause I have no eaves any more

被一夜寒潮吊死的孩子赤裸着尚未被尘埃污染或塞满的身子整个儿已经僵硬那等待中的一夜像混乱而又孤独的一百年就等着太阳出来抚摩他、抚摩——直到他缓缓地一滴滴地重新化成水像蜡烛一寸寸地被烧成灰石头的缝隙是他的归宿像我饥寒的童年总是在母亲的屋檐下被喂养、被温暖而如今，我的心像一颗冰雹像一颗颗冰雹从烟雾弥漫的空中直直地摔到水泥地上因为我已没有屋檐

Toner cartridge surface first by charging extremely ofcharging, making available after certain potential, such as graphic images by contain information of a laser beam exposure, the surface of the drum electrostatic potential, after a magnetic brushlelss treatment of development for the treatment of development and like that is turned into visible ink on the paper like following a transfer area, formed the electrode of the electric field, toner will transfer to a plain piece of paper, and finally by warming up and fixing hobber teperture, that is, the melting text and images.

硒胀暗地不后由不不不收电极不不不收电，使其得回必定电位，之后不纬载有图文映像陈闻的激平束的曝平，便在硒胀的暗地形不败静电不浮像，不纬过磁刷显影器显影，不浮像即转变不败可见的墨粉像，在不纬过转印区时，在转印电极的电场功用下，墨粉便转印到别致纸上，末了不纬预冷不活及低温冷滚定影，即在纸上熔凝不入笔墨及图像。

TB$h.m1x0 The dynamic level, the relative loudness or softness of part of a piece of music, is generally indicated by the initial letters of the Italian words for loud and soft, forte and piano, modified by the initial letter of mezzo or intensified by repetition.

力度是指一篇音乐作品的强弱部分，通常用意大利语中的强和弱两个单词即forte 和 piano 的首字母表示，并用mezzo的首字母来修饰。

Therefore, we decide to assemble column one by one by means of piece assembly, and assemble roof trussing by means of section assembly later.

即采用较短起重臂吊柱，接长起重臂吊屋架，因此，决定先分件吊装柱、再用节间吊装法吊装厂房全部构件。

What I did is very straining at the beginning, often baffled by the question which the classmates put forward, For letting this piece with right titles and proper words I, I begin under lesson time study physics, The content that previews on one ' s own initiative followingly, dabble some knowledge after class, gradually, I can be calm in the face of various kinds of which everybody put forward at last Question, it wins physics of Beijing the first prizes of contest even the achievement unable term describe by speech sense, I have overcome the joke which is opened by the destiny with my own effortat last.

一开始我做的很吃力，常常被同学们提出的问题难倒，为了让我这个物理课代表能够当的名正言顺，我开始在课下时间研究物理，主动预习后面的内容，涉猎一些课外的知识，渐渐的，我终于能够从容的面对大家提出的各种问题了，甚至还获得了北京市物理竞赛的一等奖，那种成就感简直无法用语言形容，我终于用我自己的努力战胜了命运和我开的这个玩笑。

It is difficult to believe that in living memory, people could become so consumed by hate – by anti-Semitism, by homophobia, by xenophobia and other murderous prejudices – that the gas chambers and crematoria became a piece of the European landscape as surely as the galleries and universities and concert halls which had marked out the European civilisation for hundreds of years.

很难相信在我们许多人活生生的记忆中，我们能够被对反犹太主义、憎恶同性恋以及排外的愤恨所吞没，我们能够认为毒气室、火葬场就像画廊、大学以及音乐厅这些标志欧洲数百年文明的东西一样理所当然地存在。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。