基于matlab的信号发生器设计说明

Digital Signal GeneratorYangXiao M2013705103HuaZhong University of Science and TechnologySchool of Mechanical Science and Engineering Abstract: Matlab Is a numerical analysis, matrix calculation, scientific data visualization and nonlinear dynamic state system modeling and simulation, and other functions of practical software engineering.It’s easy to use the windows environment and cast off a tradition on the interactive programming language (such as C, Fortran) Edit mode In large range. In this report,The task is to design a digital signal generator bu using matlab.It could help us to understand the signal processing by designing the digital signal generator. Which has a certain application value of reference.Keyword:digital signal generator;Matlab1.PrefaceMATLAB is called Matrix Laboratory，which is designed by the United States MathWorks company.It’s a commercial mathematical software. Matlab can be use for Matrix operations, mapping functions and data, algorithm, creating the user interface, connect to other programming languages procedures, mainly used in engineering calculations, control design, signal processing and communications, image processing, signal detection, design and financial modeling analysis and other fields. GUI (Graphical User Interface, referred to as GUI, known Graphical User Interface) is displayed using the graphical user interface of computer operations.. Matlab has a powerful GUl tool. In this report, by using matlab GUI tool we could a designed digital signal generator .2. IntroduceProgram reference implementation of MATLAB Data Acquisition Toolbox. In MATLAB design, there are two designs: the GUI editor and M-file write. This design use GUI editor . The GUI is user interface, which is to select the waveform, set and modify the waveform parameters, set the sampling rate,select the output channel and run. This program GUI interface provided: sin, square, triangle, sawtooth, while noise, to choice. Also we could change waveform parameters to change waveform’s shape. As frequency amplitude phase and sample have provided gave us to change.The interface is that:2.1 Interface3. Design PrinciplesThe task is to design the digital signal generator which can generate sine wave, square wave, triangle wave, sawtoothwave, and white noise. All the waveform can use MATLAB function, and could be adjusted by inputting information such as the amplitude, phase and frequency .3.1 Achieve sin signalThe mathematical function of sin wave signal is that:()sin 2y A ft πφ=+A: amplitude;f: frequency;φ: phase;t: 0:1/s:1;(s is sample);The M-program is:A=get(handles.Amplitude,'Value');f=get(handles.Frequency,'Value');p=get(handles.Phase,'Value');s=get(handles.Sample,'Value');x=0:1/s:1;y=A*sin(2*pi*f*x+p);plot(handles.screen,x,y,'r');legend('sin(x)');wavplay(y);grid on;axis([0,0.1,-20,20]);We could run the program by setting the parameters:3.1 Image of sin signal3.2 Achieve square signalThe mathematical function of square wave signal is that:(2)y Asquare ft b π=+A: amplitude;f: frequency;b: phase;t: 0:1/s:1;(s is sample);The M-program is:A=get(handles.Amplitude,'Value');f=get(handles.Frequency,'Value');p=get(handles.Phase,'Value');s=get(handles.Sample,'Value');x=0:1/s:10;y=A*square(2*pi*f*x+p);plot(handles.screen,x,y,'b');legend('square');wavplay(y);grid on;axis([0,0.1,-20,20]);We could run the program by setting the parameters:3.2 Image of square signal3.3 Achieve triangular signalThe mathematical function of triangular wave signal is that:(2,0.5)y Asawtooth ft b π=+A: amplitude;f: frequency;b: phase;t: 0:1/s:1;(s is sample);The M-program is:A=get(handles.Amplitude,'Value');f=get(handles.Frequency,'Value');p=get(handles.Phase,'Value');s=get(handles.Sample,'Value');x=0:1/s:10;y=A*sawtooth(2*pi*f*x+p,0.5);plot(handles.screen,x,y,'b');legend(‘triangle ’);wavplay(y);grid on;axis([0,0.1,-20,20]);We could run the program by setting the parameters:3.3 Image of triangular signal3.4 Achieve sawtooth signalThe mathematical function of sawtooth wave signal is that:(2)y Asawtooth ft b π=+A: amplitude;f: frequency;b: phase;t: 0:1/s:1;(s is sample);The M-program is:A=get(handles.Amplitude,'Value');f=get(handles.Frequency,'Value');p=get(handles.Phase,'Value');s=get(handles.Sample,'Value');x=0:1/s:10;y=A*sawtooth(2*pi*f*x+p);plot(handles.screen,x,y,'b');legend(‘tooth’);wavplay(y);grid on;axis([0,0.1,-20,20]);We could run the program by setting the parameters:3.4 Image of sawtooth signal3.5 Achieve white noise signalThe mathematical function of white noise wave signal is that:y A rand length x=-2((1,())0.5)A: amplitude;f: frequency;b: phase;t: 0:1/s:1;(s is sample);The M-program is:A=get(handles.Amplitude,'Value');f=get(handles.Frequency,'Value');p=get(handles.Phase,'Value');s=get(handles.Sample,'Value');x=0:1/s:10;y=2* A*(rand(1,length(x))-0.5);plot(handles.screen,x,y,'b');legend('white noise');wavplay(y);grid on;axis([0,0.1,-20,20]);We could run the program by setting the parameters:3.5 Image of white noise signal4 Exist problemThere are many problems in the design because I didn’t use matlab and the GUI modules ever.(1) I am not familiar to the interface and operator of matlab,which lead to I program without efficiency.(2) Without systematic studying of matlab，I could not express my ideas by using succinct matlab language.(3)In the beginning, I don’t understand the handle deep, and don,t have a clear idea.5. ConclusionIn the latter study, I will be more systematic learning MATLAB this powerful engineering software, has a fight on his understanding of the macro, on the basis of multi-programming exercises to strengthen the commonly used functions and concepts of memory, and finally, contact practical, try to solve some common engineering problems.References[1] 薛山. MATLAB基础教程. [M] ：清华大学，2011.3。