基于虛擬儀器技術(shù)的數(shù)字濾波及頻率測試

電子機(jī)電論文編號:JD879  附開題報(bào)告,任務(wù)書,源代碼,外文翻譯,論文字?jǐn)?shù):18087,頁數(shù):40

摘要 
目錄 
1.緒論  1
1.1引言  1
1.2課題的主要內(nèi)容  2
2虛擬儀器概述  3
2.1虛擬儀器的產(chǎn)生歷程  3
2.2虛擬儀器的基本概念  3
2.3虛擬儀器的組成  4
2.3.1虛擬儀器硬件平臺  4
2.3.2虛擬儀器軟件平臺  5
2.4虛擬儀器的優(yōu)點(diǎn)  6
2.5虛擬儀器與傳統(tǒng)儀器的比較  6
2.6圖形化的編程環(huán)境  7
3數(shù)字濾波器  8
3.1數(shù)字濾波器的基本概念  8
3.2濾波器的種類  8
3.3 FIR理論  10
3.4 FIR濾波器的結(jié)構(gòu)  10
3.5數(shù)字濾波器的幅頻特性  11
3.6各種數(shù)字濾波器的單位沖激響應(yīng)  12
4頻率測試  14
4.1時(shí)域測試  14
4.1.1系統(tǒng)的時(shí)域分析  14
4.1.2典型輸入信號  14
4.1.3時(shí)間響應(yīng)  15
4.2頻域測試  15
4.2.1系統(tǒng)的頻域分析 15
4.2.2頻率特性概述  15
4.2.3頻率特性性能指標(biāo)  18
5系統(tǒng)設(shè)計(jì)  19
5.1系統(tǒng)概述  19
5.2數(shù)據(jù)采集和處理模塊  20
5.2.1USB-6008數(shù)據(jù)采集卡  20
5.3數(shù)字濾波模塊  21
5.3.1濾波器的設(shè)計(jì)  21
5.3.2數(shù)字濾波的面板  27
5.4頻率測試模塊  28
5.4.1時(shí)域模塊  29
5.4.2頻域模塊  30
5.5系統(tǒng)總流程  32
6結(jié)論  36
參考文獻(xiàn)  38
致謝  39

摘  要：虛擬儀器是由一些必要的硬件獲取調(diào)理信號，并以通用計(jì)算機(jī)為平臺，實(shí)現(xiàn)不同測量軟件對采集獲得信號進(jìn)行分析處理及顯示。他打破了傳統(tǒng)儀器的功能只能由廠家定義，用戶無法改變的模式。
本系統(tǒng)主要使用labview與USB—6008數(shù)據(jù)采集卡，對所采集到的輸入信號進(jìn)行測試和分析，不但可實(shí)現(xiàn)數(shù)字濾波分析而且可對頻率進(jìn)行測試。用戶可以根據(jù)自己的實(shí)際需要選擇所需功能并設(shè)計(jì)儀器面板上的各種按鈕。頻率測量分時(shí)域和頻域兩大功能，可分別對信號的時(shí)域的瞬態(tài)指標(biāo)和頻域的頻譜分析進(jìn)行測試和顯示。頻域的主要特性有諧振峰值、頻率、幅值等進(jìn)行數(shù)值測量。時(shí)域的主要特性有直流、正峰、均方根等進(jìn)行數(shù)值測量。數(shù)字濾波器可對各種濾波后的信號進(jìn)行頻率、幅值等數(shù)值測量。

關(guān)鍵字：Labview；虛擬儀器；時(shí)域；頻域；數(shù)字濾波器；數(shù)據(jù)采集

The digital filter and frequency measurement based on the virtual instrument technology
Abstract：The virtual instrument which conditioning signals is gained by some essential hardware. It takes the general-purpose computer as a platform and the signal is realized through the different measurement software, such as signal’s analyze, process and display etc. It breaks traditional rule that the functions of instrument can only be defined by the factory, and the mode cann’t be changed by customers.
In this paper the conditioning signals is obtained by USB-6008 data acquisition card. With the development platform of LabVIEW software the inputting signals are mainly tested, analyzed and collected in the system. Not only digital the analysis of filtering can be achieved, but also the test of frequency is obtained. According to practical demand users can select the desired functions and design various buttons on the instrument. Domain function and frequency function domain are introduced, tested and displayed in the frequency measurement. In frequency domain the main parameters of the resonance peak, frequency, amplitude are tested. Main characteristics of time-domain, such as direct-current, positive peak value, root-mean-square are gotten. Filtered signal can be gained in the frequency, amplitude in digital filters.

Keywords：Labview；Virtual instruments；time-domain； frequency domain；digital filters；Data Acquisition