【正文】 。 3）用 matlab 設(shè)計(jì)實(shí)驗(yàn)平臺(tái)界面。 0 50 100 150 200 250 300 350 400 450 500 2 0 0 1 0 00100200Fr e q u e n c y ( H z )Phase (degrees)0 50 100 150 200 250 300 350 400 450 500 1 5 0 1 0 0 5 00Fr e q u e n c y ( H z )Magnitude (dB) 圖 繼續(xù)保持濾波器類型為 IIR，選擇通帶類型為帶阻濾波器，通帶 +阻帶輸入本科畢業(yè)設(shè)計(jì)論文 28 ，通帶最大衰減為 3db，阻帶最小衰減為 15db，點(diǎn)擊生成濾波器按鈕之后出現(xiàn)如圖 所示，這是一個(gè) IIR 帶阻濾波器。 圖 、三角波卷積圖 0 2 4 6 8 10 12 14 16 18 20 10 0 10 t/s s/m 0 2 4 6 8 10 12 14 16 18 20 10 0 10 t/s s/m 0 2 4 6 8 10 12 14 16 18 20 50 0 50 t/s s/m 本科畢業(yè)設(shè)計(jì)論文 21 選擇信號(hào) 1為正弦信號(hào)，信號(hào) 2選擇為三角信號(hào)，運(yùn)算方式選擇加法，點(diǎn)確定之后生成如圖 所示。進(jìn)行 GUI設(shè)計(jì)時(shí) ,首先單擊 GUI面板左邊所需的控件 ,然后在右邊的圖形界面編輯區(qū)中再次單擊某一恰當(dāng)?shù)奈恢?,這時(shí)將在該位置上為圖形界面添加一相應(yīng)的控件 ,接下來(lái) ,通過(guò)屬性編輯器和對(duì)齊編輯器對(duì)各控件設(shè)置相關(guān)屬性和進(jìn)行界面布置 ,以完善界面功能 [20]。圖形用戶界面 GUI(Graphics User Interface)是由各種圖形對(duì)象 ,如圖形窗口、圖軸、菜單、按鈕、文本框等構(gòu)建的用戶界面 ,是人機(jī)交流信息的工具和方法 ,在該界面內(nèi) ,用戶可以根據(jù)界面提示完成整個(gè)工程 ,卻不必去了解工程內(nèi)部是如何工作的。 本科畢業(yè)設(shè)計(jì)論文 16 圖 變換及在 matlab 中的實(shí)現(xiàn) 離散余弦變換 (Discrete Cosine Transform，簡(jiǎn)稱 DCT)常被認(rèn)為是對(duì)語(yǔ)音和圖像信號(hào)進(jìn)行變換的最佳方法。) xlabel(39。)。 b=[0 1 0]。 2 系統(tǒng)函數(shù)的零極點(diǎn)圖的繪制 matlab 的 zplane 函數(shù)用于 系統(tǒng)函數(shù)的零極點(diǎn)圖的繪制 ,調(diào)用方式為： zplane(b,a) 其中 b、 a 分別為系統(tǒng)函數(shù)分子、分母多項(xiàng)式的系數(shù)向量。 簡(jiǎn)單的非線性系統(tǒng)實(shí) 例： )1()1()()( 2 ???? nxnxnxny () 簡(jiǎn)單的線性系統(tǒng)實(shí)例)2()1()()2()1()( ????????? nxnxnxnynyny （ ） 3）時(shí)變與時(shí)不變系統(tǒng)的仿真。而子函數(shù)、私用函數(shù)的增添，使得復(fù)雜函數(shù)比較容易組織，既提高了軟件的“重用度”，又避免了眾多內(nèi)存變量名的沖突、龐大工具庫(kù)的函數(shù)名沖突 [9]。 繼承和發(fā)展其原有的數(shù)值計(jì)算和圖形可視能力 。 用 matlab 實(shí)現(xiàn)極點(diǎn)留數(shù)分解、 Z 反變換、求數(shù)字濾波器的頻率響應(yīng)、繪制濾波器的零極點(diǎn)圖、快速傅里葉變換和反變換 、線性調(diào)頻 Z 變換、離散余弦正變換和反變換等。 matlab 開放的產(chǎn)品體系使 matlab 成為了諸多領(lǐng)域的首選開發(fā)軟件， matlab 也成為目前數(shù)值計(jì)算、信號(hào)與系統(tǒng)的可視化等領(lǐng)域設(shè)計(jì)和仿真不可或缺的技術(shù)，在機(jī)械、電子、自動(dòng)化、水利工程等領(lǐng)域有著廣泛的應(yīng)用前景。它是把數(shù)字或符號(hào)表示的序列，通過(guò)計(jì)算機(jī)或?qū)Ｓ锰幚碓O(shè)備，用數(shù)字的方式進(jìn)行處理，以達(dá)到更符合人們要求的信號(hào)形式。 關(guān)鍵詞 ： matlab，數(shù)字信號(hào)處理，新興 本科畢業(yè)設(shè)計(jì)論文 II ABSTRACT Matlab software is launched in 1984 MathWork mathematical software. The first development philosophy is to provide a plete matrix operations the evolution of numerical puting needs, matlab has bee a variety of system simulation, digital signal processing and visualization of the standard is the international one of the most popular software. With a wide range of systems analysis to solve problems,it is one of many scientists and engineers working platform of choice for designers and master the use of matlab, and is helpful to students to broaden employment options for the surface. Digital signal processing is a widely used but many disciplines involved in many areas of emerging disciplines. It is the sequence of numbers or symbols, or special handling by puter equipment, processed using digital means to achieve more in line with the requirements of the signal form of the people. It can be analog in nature, continuous signal sampling, quantization is converted to digital signals, then the filter, transform, valuation, enhancement, pression, and recognition processing. With the puter technology and the rapid development of large scale integrated circuit, digital signal processing technology has also been rapid development and wide application. Matlab in this paper is to introduce the use of digital signal processing, including the use of the discrete time representation and matlab and systems. A typical signal generation and signal operation Functions, in digital signal processing theory and signal processing toolbox of matlab based on the preparation of Functions, Functions include: the signal of the addition, multiplication, shift and parity Convolution. matlab in the Z transform, Fourier transform of. Achieved by pole residues deposition matlab, Z inverse transform, find the digital filter frequency response, polezero filter to draw maps, fast Fourier transform and inverse transform, chirp Z transform, discrete cosine transform and inverse transform is And so on. IIR digital filter design based on matlab. FIR filter design based on is to test equipment onto a puter screen, due to time constraints, this is just a simple design with matlab platform, the platform can be some simple digital signal processing experiments. Keywords: matlab, digital signal processing, new 目錄 本科畢業(yè)設(shè)計(jì)論文 III 第一章 緒論 ........................................................ 4 研究的意義和背景 ............................................. 4 研究的目的 ................................................... 4 研究的內(nèi)容 ................................................... 5 國(guó)內(nèi)外研究發(fā)展情況 ........................................... 5 第二章 matlab 的介紹 ................................................ 7 matlab 簡(jiǎn)介 ................................................. 7 matlab 語(yǔ)言的發(fā)展歷程和影響 ................................. 7 matlab 語(yǔ)言的特點(diǎn) ............................................ 7 matlab 的工作環(huán)境 ........................................... 8 工作環(huán)境的特點(diǎn) ............................................. 8 第三章用 MATLAB 表示和實(shí)現(xiàn)離散時(shí)間系統(tǒng) .............................. 9 時(shí)域離散系統(tǒng) ................................................. 9 系統(tǒng)的線性性質(zhì) ......................................... 9 系統(tǒng)的時(shí)不變特性 ....................................... 9 系統(tǒng)的因果性 ........................................... 9 系統(tǒng)的穩(wěn)定性 ........................................... 9 系統(tǒng)的沖激響應(yīng) ........................................ 10 卷積的性質(zhì) ............................................ 10 matlab 在離散系統(tǒng)中的應(yīng)用 ................................... 10 matlab 在離散系統(tǒng)時(shí)域分析中的應(yīng)用 ..................... 10 Matlab 在離散系統(tǒng) Z 域分析中的應(yīng)用 .................... 12 變換及在 matlab 中的實(shí)現(xiàn) ............................ 16 本章小結(jié) .................................................... 17 第四章基于 matlab 數(shù)字信號(hào)處理虛擬實(shí)驗(yàn)仿真平臺(tái)的實(shí)現(xiàn) ............... 18 界面的設(shè)計(jì)方法 .............................................. 18 句柄圖形及圖形用戶界面 ................................ 18 GUIDE 的設(shè)計(jì)過(guò)程 ...............