【正文】 C analysis is in fact the imaginary part of s, which, as mentioned earlier, is posed of a real part s and an imaginary part jω. If we replace s by jω in any of the above equations, we have the circuit39。s imaginary part, jω, helps describe a response to AC signals, the real part, σ, helps describe a circuit39。 the integrator makes an infinite response. For the lowpass filter, pole positions further down the σ axis mean a higher ω0, a shorter time constant, and therefore a quicker transient response. Conversely, a pole closer to the jω axis causes a longer transient response. So far, we have related the mathematical transfer functions of some simple circuits to their associated poles and zeroes in the plexfrequency plane. From these functions, we have derived the circuit39。 4ac) equals ω0178。 4ac) is negative and the roots are plex. The real part is therefore b/2a, which is ω0/2Q, and mon to both roots. The roots39。s frequency response and see how it varies with Q. As before, Figure 4a shows the function as a curved surface, depicted in the threedimensional space formed by the plex plane and a vertical magnitude vector. Further, Q = , and you can see immediately that the response is a lowpass filter.There is also an effect on the filter39。它首先解決了基本類型：第一和第二階濾波器，高通和低通濾波器，陷波和全通濾波器，以及高階濾波器。用一個(gè)簡單的集成商開始，我們首先發(fā)展一種有源濾波器一般直觀的方法。考慮我們所知道的一個(gè)積分直觀。在任何頻率的傳遞函數(shù)的值變?yōu)闊o限）我們也知道，集成的增益削弱日益頻繁，并在輸出電壓高頻率幾乎為零。 當(dāng)S = 0，函數(shù)簡化為ω0/ω0，即統(tǒng)一。在極ω0是顯而易見的。圍繞這一個(gè)零復(fù)平面。在交流分析jω其實(shí)S的，虛的一部分，正如前面提到的，是一個(gè)真正的組成部分及一個(gè)虛部jω。我們沿著jω切軸的功能，并強(qiáng)調(diào)RC低通濾波器的頻率響應(yīng)，加入了積極jω沿軸重型線函數(shù)值曲線。低通濾波器的瞬態(tài)響應(yīng)，更穩(wěn)定，因?yàn)樗鼧O是否定的復(fù)雜飛機(jī)的真正的一半。相反，極接近jω軸原因較長的瞬態(tài)響應(yīng)。也就是說，它們是一階濾波器。二階低通濾波器二階濾波器秒的分母和兩個(gè)復(fù)平面極點(diǎn)。術(shù)語（二178。因此，然后兩個(gè)根源是真實(shí)的，躺在負(fù)實(shí)軸。真正的部分，因此b/2a，這是ω0/2Q，共同為雙方的根源。 變?chǔ)?更改原點(diǎn)極點(diǎn)39。在這種情況下，相應(yīng)的電路相當(dāng)于兩個(gè)級(jí)聯(lián)一階濾波器，如前所述。由于極39。在圖3a LCR測(cè)試電路，這種情況是不可能的，除非?= 0。這種極點(diǎn)配置的靈活性是一個(gè)強(qiáng)大的工具，使第二階段，命令在許多開關(guān)電容濾波器的有用成分。其結(jié)果是無窮遠(yuǎn)雙零。第二章詳細(xì)敘述了MATLAB的信號(hào)處理工具箱函數(shù)。[3] 于潤偉. MATLAB基礎(chǔ)及應(yīng)用【M】. 北京：機(jī)械工業(yè)出版社，摘。[2] 陳桂明，張明照，戚紅雨. 應(yīng)用MATLAB語言處理數(shù)字信號(hào)與數(shù)字圖像【M】.北京：科學(xué)出版社，摘要：數(shù)字信號(hào)與數(shù)字圖像處理技術(shù)的掌握與應(yīng)用，必須具有扎實(shí)的理論知識(shí)，并且能夠熟練使用一些工具。附錄B: 主要參考文獻(xiàn)的題錄及摘要[1] 樓順天，李博菡. 基于MATLAB的系統(tǒng)分析與設(shè)計(jì)——信號(hào)處理【M】. 西安：西安電子科技大學(xué)出版社，摘要：本書為信號(hào)處理部分，全書分為三個(gè)章節(jié)。二階函數(shù)下降速度的兩倍，然而，由于章分母178。二階濾波器提供了變量ω0和Q，這使我們能夠進(jìn)行極無論我們希望inthe復(fù)平面上。較低的值較少的Q敲響的結(jié)果，因?yàn)樽枘岣蟆４送?，您可以立即看到響?yīng)是一個(gè)低通濾波器。降低的Q逐漸向?qū)Ψ綐O，增加的Q移動(dòng)成半圓形的兩極彼此遠(yuǎn)離，向jω軸。虛部將平等和符號(hào)相反。這宗案件是不是很有趣，所以我們將只考慮案件其中Q“，這意味著（二178。（1 / Q首頁178。考慮圖3a無源LC濾波器，例如。以便設(shè)計(jì)出一套更緊密地過濾器的應(yīng)用需求，我們必須更高的訂單。從這些功能，我們得到的電路的頻率響應(yīng)（因此它的波特圖），并且它的瞬態(tài)響應(yīng)。的集成使無限的反應(yīng)。 雖然復(fù)雜頻率的虛部，jω，幫助說明對(duì)交流信號(hào)的反應(yīng)，真正的一部分，σ，有助于描述了電路的瞬態(tài)響應(yīng)。在圖2b中的復(fù)雜情節(jié)，σ= 0，因此擰沿積極jω軸=jω。瞬態(tài)響應(yīng)進(jìn)行分析時(shí)使用拉普拉斯變換，我們使用這些元素阻抗SL和1/sC。為積分器和RC低通濾波器，頻率響應(yīng)趨于零的無窮的頻率。當(dāng)S = ω0，分母是零和函數(shù)的值是無窮的，這表明在復(fù)頻率平面極點(diǎn)。簡單的RC低通濾波器稍微復(fù)雜一些過濾器是簡單的低通RC型（圖2a）。無視這一限制，一個(gè)積分為零的頻率響應(yīng)是無限的，這意味著它有一個(gè)為零高頻極點(diǎn)。具體整合的濾波器，這里描述包括Maxim公司的MAX7400家族較高階開關(guān)電容濾波器。導(dǎo)言易于使用，使集成開關(guān)電容濾波器，對(duì)許多應(yīng)用來說極具吸引力。 negativereal part is smaller, an input step function will cause ringing at the filter output. Lower values of Q result in less ringing, because the damping is greater. If Q bees infinite, the poles reach the jω axis, causing an infinite frequency response (instability and continuous oscillation) at s = ω0. In the LCR circuit in Figure 3a, this condition would not be possible unless R = 0. For filters that contain amplifiers, however, the condition is indeed possible and must be considered in the design process. A secondorder filter provides the variables ω0 and Q, which allow us to place poles wherever we want inthe plex plane. These poles must, nonetheless, occur as plexconjugate pairs, in which the real parts are equal and the imaginary parts have opposite signs. This flexibility in pole placement is a powerful tool, making the secondorder stage a useful ponent in many switchedcapacitor filters. As in the firstorder case, the secondorder lowpass transfer function approaches zero as frequency increases to infinity. The secondorder function decreases twice as fast, however, because of the s178。 distance from the origin. Decreasing the Q moves the poles toward each other。 4). So if Q is less than then both roots are real and lie on the negativereal axis. The circuit39。 in the denominator and two poles in the plex plane. You can obtain such a response by using inductance and capacitance in a passive circuit or by creating an active circuit of resistors, capacitors, and amplifiers. Consider the passive LC filter in Figure 3a . In this case, a = 1, b = ω0/Q, and c = ω0178。s response pared to that of the integrator. The lowpass filter39。s value along this axis is the frequency response of the filter. We have sliced the function along the jω axis and emphasized the RC lowpass filter39。s value is infinite, indicating a pole in the plex frequency plane. The magnitude of the transfer function is plotted against s in Figure 2b, where the real ponent of s, σ, is toward us and the positive imaginary part, jω, is toward the right. The pole at ω 0 is evident. Amplitude is shown logarithmically to emphasize the function39。謝謝你們！以后的生活中，我也一定會(huì)更加努力的！謝謝！ 作 者： 日 期： 2010 年 6 月 16 日參考文獻(xiàn)[1] 劉敏，魏玲. Matlab 通信仿真與應(yīng)用【M】. 北京: 國防工業(yè)出版社, 2001 .[2] 樓順天, 劉小東, 的系統(tǒng)分析與設(shè)計(jì)【J】.信號(hào)處理. 西安: 西安電子科技大學(xué), 2005.[3] 陳懷深. MATLAB及其在理工課程中的應(yīng)用指南【M】.西安：西安交通大學(xué)出版社，1998.[4] 程佩青. 數(shù)字信號(hào)處理教程【M】.北京: 清華大學(xué)出版社,2002.[5] 【J】.吉林水利學(xué)報(bào)，2002,5（5）：3538[6] Fisk, C. Some developments in equilibrium traffic assignment【J】. Transportation Research B, 1980,14(3): 243255.[7] 徐明遠(yuǎn)，【M】.西安：西安電子科技大學(xué)出版社，2005[8] Dial, . A probabilistic multipath assignment model whichobviates path enumeration 【J】. Transportation Research,1971( 5) : 83111.[9] 雷學(xué)堂，【J】.合肥學(xué)院學(xué)報(bào)【自然科學(xué)版】，2006(3)：4852[10] 于潤偉. MATLAB基礎(chǔ)及應(yīng)用【M】. 北京：機(jī)械工業(yè)出版社，[11] 【M】.北京：北京理工大學(xué)出版社，重版[12] Heinz Spiess, Michael Florian. Optimal strategies : A New Assignment Model for Transit Networks 【J】.Transportation Research Part B,1989,23(2):83102.[13] SORIAE,CALPEJ,CHAMBERSJ, analysis of a variable stepsize normalized LMS adap tive filter algorithm【J】.IEEE Transact ions on