【正文】 ，3個(gè)鍵可以分別控制波形的選擇和頻率的升降。0xf0=0xe0時(shí)，說(shuō)明波形選擇鍵按下，當(dāng)P3amp。0xf0=0xb0時(shí)，說(shuō)明頻率衰減鍵按下。1602字符型LCD通常有14條引腳線(xiàn)或16條引腳線(xiàn)的LCD，多出來(lái)的2條線(xiàn)是背光電源線(xiàn)。液晶顯示器具有厚度薄、適用于大規(guī)模集成電路直接驅(qū)動(dòng)、易于實(shí)現(xiàn)全彩色顯示的特點(diǎn)，目前已經(jīng)被廣泛應(yīng)用在便攜式電腦、數(shù)字?jǐn)z像機(jī)、PDA移動(dòng)通信工具等眾多領(lǐng)域。主要是頻率改變流程和波形輸出流程的程序設(shè)計(jì)，這一部分主要是考核大家在大學(xué)期間C語(yǔ)言和匯編語(yǔ)言的掌握程度。第5章 系統(tǒng)調(diào)試調(diào)試工作可分硬件調(diào)試和軟件調(diào)試兩個(gè)部分，調(diào)試方法如下：首先，硬件調(diào)試主要是先制作硬件電路板，然后用萬(wàn)用表等工具對(duì)電路檢查，最后應(yīng)用程序進(jìn)行功能調(diào)試。然后，用仿真軟件進(jìn)行軟件調(diào)試，比如單片機(jī)C51編輯軟件KEIL，該軟件提供一個(gè)集成開(kāi)發(fā)環(huán)境uVision，它包括C編輯器、宏編輯器、連接器、庫(kù)管理和一個(gè)功能強(qiáng)大的仿真調(diào)試器。但應(yīng)用此方法，仍需要十分了解所使用元器件的工作方式和管腳連接方式。除了語(yǔ)法差錯(cuò)和邏輯差錯(cuò)外，當(dāng)確認(rèn)程序沒(méi)問(wèn)題時(shí)，通過(guò)直接加載到 protues 軟件電路中進(jìn)行仿真。關(guān)鍵是這個(gè)實(shí)際系統(tǒng)設(shè)計(jì)的過(guò)程，在整個(gè)過(guò)程中我可以充分發(fā)揮單片機(jī)知識(shí)。通過(guò)單片機(jī)控制一個(gè)模數(shù)轉(zhuǎn)換器 DAC0832 產(chǎn)生所需要的電流，然后使用運(yùn)算放大器 LM324可以將其電流輸出線(xiàn)性地轉(zhuǎn)換成電壓輸出，通過(guò)程序的控制，可以產(chǎn)生一系列有規(guī)律的波形。此設(shè)計(jì)方案硬件較為簡(jiǎn)單，主要是由單片機(jī)跟 DAC0832 2個(gè)芯片構(gòu)成，連線(xiàn)也較簡(jiǎn)便。軟件程序方面較為復(fù)雜一點(diǎn)，此方案主要是靠程序的控制，主要由3個(gè)波形產(chǎn)生的子程序和1602液晶顯示程序，加上有承上啟下作用的主程序構(gòu)成，程序思路還是比較清晰。當(dāng)然還是存在不足的地方，比如不能實(shí)現(xiàn)任意頻率與幅度的可調(diào)，顯示電路跟鍵盤(pán)電路有待進(jìn)一步改進(jìn)。如果沒(méi)有宋老師的幫助我是不可能完成這次畢業(yè)設(shè)計(jì)的，還有各位同學(xué)和我的室友，在此期間對(duì)我的幫助和鼓勵(lì)，使我在設(shè)計(jì)的時(shí)候信心十足。還有一同討論、幫助我設(shè)計(jì)的同學(xué)表示感謝。我在這里謝謝幫助過(guò)和勸導(dǎo)過(guò)我的人，我的人生因?yàn)橛心銈兌用利愝x煌。出版物的數(shù)量與應(yīng)用程序的重量操縱化學(xué)數(shù)據(jù)已迅速增加在過(guò)去的兩年里從一個(gè)論文被發(fā)表在1989年到1996年的論文和41 18 1997年的論文。在這些發(fā)表的作品,重量是主要用于噪聲去除和數(shù)據(jù)壓縮在不同領(lǐng)域的分析化學(xué),包括流動(dòng)注射分析、高效液相色譜、紅外光譜、質(zhì)譜、核磁共振譜、紫外可見(jiàn)光譜法和伏安法。本文應(yīng)用小波變換的小波包變換及其衍生物(WPT)進(jìn)行了綜述。 早期的旋轉(zhuǎn)機(jī)械故障特征是很弱的,是被強(qiáng)噪聲一般。深入研究了旋轉(zhuǎn)機(jī)械的基本特征和常見(jiàn)的早期故障診斷方法,并總結(jié)了研究現(xiàn)狀的早期診斷領(lǐng)域的機(jī)械設(shè)備信號(hào)特征提取和故障診斷。模擬和數(shù)字信號(hào)可以另外生產(chǎn)同時(shí)在兩種模式不僅提供測(cè)試的刺激,但也參考反應(yīng)的ADC內(nèi)置的年代除了一個(gè)比特?cái)?shù)模轉(zhuǎn)換器和平滑濾波器,這個(gè)提議建造完全由發(fā)生器是數(shù)字電路,因此很容易集成了這個(gè)硅函數(shù)和驗(yàn)證本身在測(cè)試之前的ADC。幾種不同的技術(shù)利用兩個(gè)模擬和數(shù)字的方法正在被用于生成周期信號(hào)。在這項(xiàng)研究中,我們提出建模、模擬和原型小說(shuō)定期任意信號(hào)的生成系統(tǒng)利用fpga。方法:一個(gè)新方法任意信號(hào)發(fā)生器發(fā)揮重要作用在許多應(yīng)用程序中。結(jié)果:仿真結(jié)果展示了數(shù)字和模擬版本了。幾種不同的技術(shù)利用兩個(gè)模擬和數(shù)字的方法正在被用于一代的結(jié)論:優(yōu)秀的精度與零誤差達(dá)到。 有許多不同類(lèi)型的信號(hào)發(fā)生器,為不同的目的和應(yīng)用程序(和在不同程度的費(fèi)用)。因此選擇信號(hào)發(fā)生器是按需求。這個(gè)模塊是基于CAMAC接口,但可以用于測(cè)試兩CAMAC和PXI數(shù)據(jù)采集這個(gè)模塊是基于CAMAC接口,但可以用于測(cè)試兩CAMAC和PXI數(shù)據(jù)采集系統(tǒng)在sst 1托卡馬克裝置。與傳統(tǒng)的信號(hào)發(fā)生器,嵌入式硬件,它是一個(gè)靈活的硬件裝置,可編程通過(guò)圖形用戶(hù)界面(GUI)開(kāi)發(fā)的虛擬儀器的應(yīng)用程序開(kāi)發(fā)工具。這可以通過(guò)前面板開(kāi)關(guān)或通過(guò)CAMAC軟件命令(用于遠(yuǎn)程操作)。模塊有設(shè)施接受外部TTL電平觸發(fā)和時(shí)鐘通過(guò)羅曼蘭連接器。這可以通過(guò)前面板開(kāi)關(guān)或通過(guò)CAMAC軟件命令(用于遠(yuǎn)程操作)。模塊有設(shè)施接受外部TTL電平觸發(fā)和時(shí)鐘通過(guò)羅曼蘭連接器。該模塊生成兩種類(lèi)型的信號(hào):模擬和數(shù)字(TTL級(jí)別)。該模塊是非常有用的測(cè)試多達(dá)32個(gè)頻道同時(shí)具有不同不同的頻率在集團(tuán)幫助我們測(cè)試階段不同渠道轉(zhuǎn)移。附錄2 英文參考資料 Starting from 1989, a new mathematical technique known as wavelet transform (WT) has been applied successfully for signal processing in chemistry. The number of publications related to the application of WT to manipulate chemical data has increased rapidly in the last 2 years from one paper being published in 1989 to 18 papers in 1996 and 41 papers in 1997. More than 70 papers were published within the period from 1989 to 1997. In these published works, WT was mainly employed for noise removal and data pression in different fields of analytical chemistry that include flow injection analysis, high performance liquid chromatography, infrared spectrometry, mass spectrometry, nuclear magnetic resonance spectrometry, ultraviolet–visible spectrometry and voltammetry. It has been employed to solve certain problems in quantum chemistry and chemical physics. In this paper, applications of the wavelet transform and its derivative wavelet packet transform (WPT) are reviewed. Research works on WT by Chinese researchers in China are also included. Early fault features of rotating machinery is very weak and is disturbed by strong noise generally. how to more accurately extract early (weak) fault features from signals is still a hot and difficult point of research of the discipline. An intensive study is given to basic features of rotating machinery early faults and mon diagnosis method, And also summarized the research status of early diagnosis in the field of mechanical equipment signal feature extraction and fault diagnosis.In order to perform an onchip test for characterizing both static and transmission parameters of embedded analogtodigital converters (ADCs), this paper presents an oscillatorbased reconfigurable sinusoidal signal generator which can produce both high and low frequency sinusoidal signals by switching the oscillator into different modes. Analog and digital signals can additionally be produced concurrently in both modes to provide not only test stimuli, but also reference responses for the ADC builtin selftest. The generated oscillation signal amplitude and frequency can be easily and precisely controlled by simply setting the oscillator clock frequency and initial condition coefficients. Except for a 1bit digitaltoanalog converter and smoothing filter, this proposed generator is constructed entirely by digital circuits, and hence easily integrates this silicon function and verifies itself before testing the ADCs. Arbitrary signal generators play an important role in many applications. Several different techniques utilizing both analog and digital approaches are being used for the generation of periodic signals. However, all of them suffer from many drawbacks. In this study, we present modeling, simulation and prototyping of a novel periodic arbitrary signal generation system using FPGAs. The proposed system utilizes orthogonal functions to generate a variety of periodic arbitrary signals. Approach:A new approach for designing arbitrary signals utilizing Walsh and Rademacher functions had been used. The design had been done using stateoftheart high level design techniques and has been targeted to the latest available FPGA chips from Xilinx and Altera. Results:The simulation results demonstrated both the digital and analog versions were presented. It was found that all the signals generated showed precisely zero error and the signal generated was exactly the same as the desired one. Conclusion:Excellent accuracy with zero error is achieved. The designed and implemented Arbitrary signal Generation System is standalone and doesn?t require the support of any puter hardware or software, as was needed in earlier attempts It has been con