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1、精品名师归纳总结封面可编辑资料 - - - 欢迎下载精品名师归纳总结作者： PanHongliang仅供个人学习可编辑资料 - - - 欢迎下载精品名师归纳总结Digital signal andanalysisTitle:A filter and equilizerName:YangxiaoClass:Master of mechanical engineering 1302StudentID:M202170503可编辑资料 - - - 欢迎下载精品名师归纳总结Abstrac:tDesigning somekinds offiltersbyusingmatlab.We can underst
2、and thesignal processing offiltermorecomprehensive by analyzingthefilteringpropertiesofdifferentfilters.Designing anadjustable parameter of digital filter which is called equalizer.In this paper, the digital equalizer which is based on MATLAB platform designing has the functions ofaccessing Wav file
3、 , filtering and playing.可编辑资料 - - - 欢迎下载精品名师归纳总结Keyword:Matlab,Filter,Equalizer1.PrefaceMATLAB is called Matrix Laborator，ywhich is designed by the可编辑资料 - - - 欢迎下载精品名师归纳总结United States MathWorks company.Its a commercial mathematical software. Matlab can be use for Matrix operations, mapping functio
4、nsand 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 Graph
5、ical 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 design a signal filter and equalizer.The filter Can be divided into low-pa
6、ss, high-pass filter, band pass andband-stop filter.Low-pass filter: it allows signal in low frequency or dc可编辑资料 - - - 欢迎下载精品名师归纳总结component through, suppress the high frequency component or the interference and noise.High-pass filter: it allows the signal in high frequency , restrain low frequency
7、 or dc component.Band-pass filter: it allows a spectrum of signal through and restrain the signal below or above the spectrum, interference and noise.Band-stop filter: it inhibit the signal within a certain frequency band and pass the signal outside the spectrum.2. IntroduceThe filter which is desig
8、ned by using matlab have four functions :low- pass,high-pass,band-stop and band-pass .Every function could input the cut-off frequencies.The equalizer could filter the wav file inputted as we want.The interface is that:可编辑资料 - - - 欢迎下载精品名师归纳总结3. Design Principles2.1 Interface可编辑资料 - - - 欢迎下载精品名师归纳总结
9、The task is to design the filter and equalizer which can edit the inputting signal as we want and choose the frequency spectrum to pass.3.1 the standard signal inputWe design a signal generator which is used to generator standard waveform such as sin,square,triangular,sawtooth and noise.And we can d
10、ecide whether adding different waves .The program is:Fs=10000。可编辑资料 - - - 欢迎下载精品名师归纳总结N=400。x=linspace0,N/Fs,N。t=gethandles.WaveMake,Value。f=str2doublegethandles.frequency,String。a=str2doublegethandles.amplitude,String。 p=0。switch tcase 1y=a*sin2*pi*x*f+p。if gethandles.add,Value=0.0 handles.y=y。else
11、handles.y=handles.y+y。 endcase 2.case 5y=a*2*randsizex-1 。if gethandles.add,Value=0.0 handles.y=y。elsehandles.y=handles.y+y。可编辑资料 - - - 欢迎下载精品名师归纳总结endend handles.inputtype=3。guidatahObject,handles。plothandles.axes1,handles.y。 xlim0 200 。temple=handles.y。f=linspace0,Fs/2,N/2。P=2*ffttemple,N/N 。Pyy=s
12、qrtP.* conjP。plothandles.axes2,f,Pyy1:N/2。The interface is:3.1 the image of waveform3.2 the wave filteringBy choosing the working mode of filter and input cut-off frequencies we can realize the filtering.Theprogram is:y=handles.y。FC=str2doublegethandles.hf,string。Fs=22000。n=44100。N=8。Wn=FC/Fs/2。可编辑资
13、料 - - - 欢迎下载精品名师归纳总结% the low-pass program b,a = butterN,Wn,low 。z=filterb,a,y 。P=fftz,n 。f=linspace0,Fs/2,n/2。Pyy=2*sqrtP.* conjP/n。plothandles.axes3,z。plothandles.axes4,f,Pyy1:n/2。handles.z=z。guidatahObject,handles。By running the program we can realize low-pass filter3.2 the image of low-pass filt
14、er The high-pass program is:b,a = butterN,Wn,high 。z=filterb,a,y 。P=fftz,n。f=linspace0,Fs/2,n/2。Pyy =2*sqrtP.* conjP/n。plothandles.axes3,z。plothandles.axes4,f,Pyy1:n/2。handles.z=z。guidatahObject,handles。可编辑资料 - - - 欢迎下载精品名师归纳总结By running the program we can realize high-pass filter3.3 the image of hi
15、gh-pass filter The band-stop program is:b,a = butterN,Wn,stop。z=filterb,a,y 。P=fftz,n。f=linspace0,Fs/2,n/2。Pyy=2*sqrtP.* conjP/n。plothandles.axes3,z。plothandles.axes4,f,Pyy1:n/2。handles.z=z。guidatahObject,handles。By running the program we can realize band-stop filter3.4 the image of band-stop filter
16、 The band-pass program is:b,a = butterN,Wn,bandpass。z=filterb,a,y 。P=fftz,n。f=linspace0,Fs/2,n/2。handles.Pyy=2*sqrtP.* conjP/n 。plothandles.axes3,z。可编辑资料 - - - 欢迎下载精品名师归纳总结plothandles.axes4,f,handles.Pyy1:n/2。handles.z=z。guidatahObject,handles。By running the program we can realize band-pass filter3.
17、5 the image of band-pass filter3.3 the equalizer filteringWe can open a wav file by run this program: filename,pathname=uigetfile*.wav,select a wavfile 。if isequalfilename,0dispthe user cancels to select。elsestr=strcatpathname,filename。dispstrcatthe user select ,str。sethandles.filename,string,str。en
18、d y,Fs,bits=wavreadstr。handles.y=y。handles.z=y。guidatahObject,handles。When we choose a wav file, we can realize equalizer filter by setting the values of The scroll bars and run the program:可编辑资料 - - - 欢迎下载精品名师归纳总结handles.a=handles.y:,1。y=handles.a。l=lengthy 。Fs=44100。%t=0:l-1/Fs 。Y=zerossizey。A1=ge
19、thandles.slider1,value。b,a=butter2,30/Fs/2,60/Fs/2,bandpass。Y=Y+2*A1*filterb,a,y。A2=gethandles.slider2,value。b,a=butter2,60/Fs/2,100/Fs/2,bandpass。Y=Y+2*A2*filterb,a,y。A3=gethandles.slider3,value。b,a=butter2,100/Fs/2,200/Fs/2,bandpass。Y=Y+2*A3*filterb,a,y。A4=gethandles.slider4,value。b,a=butter2,200/
20、Fs/2,500/Fs/2,bandpass。Y=Y+2*A4*filterb,a,y。A5=gethandles.slider5,value。b,a=butter2,500/Fs/2,1000/Fs/2,bandpass。Y=Y+2*A5*filterb,a,y。A6=gethandles.slider6,value。可编辑资料 - - - 欢迎下载精品名师归纳总结b,a=butter2,1000/Fs/2,2000/Fs/2,bandpass。Y=Y+2*A6*filterb,a,y。A7=gethandles.slider7,value。b,a=butter2,2000/Fs/2,400
21、0/Fs/2,bandpass。Y=Y+2*A7*filterb,a,y。A8=gethandles.slider8,value。b,a=butter2,4000/Fs/2,8000/Fs/2,bandpass。Y=Y+2*A8*filterb,a,y。z=Y 。Fs=44100。ysize=sizehandles.y。N=str2doublenum2strysize1。wavplayz,Fs。P=ffty,N 。Pyy1=2*sqrtP.*conjP/N 。P=fftz,N 。Pyy =2*sqrtP.* conjP/N 。f=linspace0,Fs/2,N/2。%Original wav
22、e time=1:lengthy/Fs 。plothandles.axes1,time,y。%Original frequency可编辑资料 - - - 欢迎下载精品名师归纳总结plothandles.axes2,f,Pyy11:N/2。%The equilizer wave plothandles.axes3,time,z。%The equilizer frequencyplothandles.axes4,f,Pyy1:N/2。guidatahObject,handles。The interface is:3.6 the image of equalizerWe can see the eq
23、ualizer realize the function of frequency filtering well.4 .Exist problemThe interfaces are not enough beautifulThe equlizer cannt realize Pause, fast forward, and so on. The spectrum of music cannot be updated in real time.5. ConclusionWith the complement of the third project, the whole projects in
24、 the course have been finished.From the beginning when I dont know the content as well as the soft matlab very much ,in the end when I have complete all the projects with the matlab,it is really not easy.There is no need to say that I can make a simple system with the soft matlab now. The last one ,
25、the filter and equalizer is the combination of可编辑资料 - - - 欢迎下载精品名师归纳总结the knowledge that is obtained from the designing the first two projects.With the basis of knowledge in the course as well as matlab, I will not be afraid of the problem. Nothing is impossible to a willing mind. If we make up our
26、minds to do a thing ,we will solve all the problems in the可编辑资料 - - - 欢迎下载精品名师归纳总结last.References可编辑资料 - - - 欢迎下载精品名师归纳总结1 薛山. MATLAB 基础教程 .M 北京：清华高校出版社， 2021.3版权申明本文部分内容，包括文字、图片、以及设计等在网上搜集整理。版权为潘宏亮个人全部This article includes some parts, including text, pictures, and design. Copyright is Pan Hongliang
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