function varargout = p412(varargin)
% P412 M-file for p412.fig
%      P412, by itself, creates a new P412 or raises the existing
%      singleton*.
%
%      H = P412 returns the handle to a new P412 or the handle to
%      the existing singleton*.
%
%      P412('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in P412.M with the given input arguments.
%
%      P412('Property','Value',...) creates a new P412 or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before p412_OpeningFunction gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to p412_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help p412

% Last Modified by GUIDE v2.5 30-May-2005 21:37:46
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @p412_OpeningFcn, ...
                   'gui_OutputFcn',  @p412_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin & isstr(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT


% --- Executes just before p412 is made visible.
function p412_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to p412 (see VARARGIN)

% Choose default command line output for p412
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes p412 wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = p412_OutputFcn(hObject, eventdata, handles)
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;
% --- Executes during object creation, after setting all properties.function edit1_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit1 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    empty - handles not created until after all CreateFcns called% Hint: edit controls usually have a white background on Windows.%       See ISPC and COMPUTER.if ispc    set(hObject,'BackgroundColor','white');else    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));endfunction edit1_Callback(hObject, eventdata, handles)% hObject    handle to edit1 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% Hints: get(hObject,'String') returns contents of edit1 as text%        str2double(get(hObject,'String')) returns contents of edit1 as a double% --- Executes during object creation, after setting all properties.function edit2_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit2 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    empty - handles not created until after all CreateFcns called% Hint: edit controls usually have a white background on Windows.%       See ISPC and COMPUTER.if ispc    set(hObject,'BackgroundColor','white');else    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));endfunction edit2_Callback(hObject, eventdata, handles)% hObject    handle to edit2 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% Hints: get(hObject,'String') returns contents of edit2 as text%        str2double(get(hObject,'String')) returns contents of edit2 as a double% --- Executes during object creation, after setting all properties.function edit3_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit3 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    empty - handles not created until after all CreateFcns called% Hint: edit controls usually have a white background on Windows.%       See ISPC and COMPUTER.if ispc    set(hObject,'BackgroundColor','white');else    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));endfunction edit3_Callback(hObject, eventdata, handles)% hObject    handle to edit3 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% Hints: get(hObject,'String') returns contents of edit3 as text%        str2double(get(hObject,'String')) returns contents of edit3 as a double% --- Executes during object creation, after setting all properties.function edit4_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit4 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    empty - handles not created until after all CreateFcns called% Hint: edit controls usually have a white background on Windows.%       See ISPC and COMPUTER.if ispc    set(hObject,'BackgroundColor','white');else    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));endfunction edit4_Callback(hObject, eventdata, handles)% hObject    handle to edit4 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% Hints: get(hObject,'String') returns contents of edit4 as text%        str2double(get(hObject,'String')) returns contents of edit4 as a double% --- Executes during object creation, after setting all properties.function popupmenu1_CreateFcn(hObject, eventdata, handles)% hObject    handle to popupmenu1 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    empty - handles not created until after all CreateFcns called% Hint: popupmenu controls usually have a white background on Windows.%       See ISPC and COMPUTER.if ispc    set(hObject,'BackgroundColor','white');else    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));end% --- Executes on selection change in popupmenu1.function popupmenu1_Callback(hObject, eventdata, handles)% hObject    handle to popupmenu1 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% Hints: contents = get(hObject,'String') returns popupmenu1 contents as cell array%        contents{get(hObject,'Value')} returns selected item from popupmenu1% --- Executes on button press in pushbutton1.function pushbutton1_Callback(hObject, eventdata, handles)% hObject    handle to pushbutton1 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)Rs = str2double(get(handles.edit1,'String'));
Rp = str2double(get(handles.edit2,'String'));
w1 = str2double(get(handles.edit3,'String'));
w2 = str2double(get(handles.edit4,'String'));

wp = w1*pi;
ws = w2*pi;

axes(handles.axes1)% Select the proper axes

val = get(handles.popupmenu1,'Value');
switch val
case 1
    %Compute Oder and Cutoff frequency
    [N,Wn] = buttord(wp,ws,Rp,Rs,'s');
    N
    Fc = Wn/(2*pi)
    %compute the filter
    [b,a] = butter(N,Wn,'s');
    %Output
    w = linspace(1,3000,1000)*2*pi;
    H = freqs(b,a,w);
    magH = abs(H);
    phaH = unwrap(angle(H));
    plot(w/(2*pi),20*log10(magH));
    xlabel('Frequency(Hz)');
    ylabel('Magnidute(dB)');
    title('巴特沃斯低通濾波器')
    grid on
case 2
    %Chebyshev analog lowpass filter prototype
    [N,Wn] = cheb1ord(wp,ws,Rp,Rs,'s');
    N
    %Compute the filter
    [b,a] = cheby1(N,Rp,Wn,'s');
    %Output
    w = linspace(1,3000,1000)*2*pi;
    H = freqs(b,a,w);
    magH = abs(H);
    phaH = unwrap(angle(H));
    plot(w/(2*pi),20*log10(magH));
    xlabel('Frequency(Hz)');
    ylabel('Magnidute(dB)');
    title('切比雪夫I型低通濾波器')
    grid on
case 3
    %Chebyshev analog lowpass filter prototype
    [N,Wn] = cheb2ord(wp,ws,Rp,Rs,'s');
    N
    %Compute the filter
    [b,a] = cheby2(N,Rp,Wn,'s');
    %Output
    w = linspace(1,3000,1000)*2*pi;
    H = freqs(b,a,w);
    magH = abs(H);
    phaH = unwrap(angle(H));
    plot(w/(2*pi),20*log10(magH));
    xlabel('Frequency(Hz)');
    ylabel('Magnidute(dB)');
    title('切比雪夫II型低通濾波器')
    grid on
case 4
    %Compute Oder and Cutoff frequency
    [N,Wn] = ellipord(wp,ws,Rp,Rs,'s');
    N
    %Compute the filter
    [b,a] = ellip(N,Rp,Rs,Wn,'high','s');
    %Output
    w = linspace(1,3000,1000)*2*pi;
    H = freqs(b,a,w);
    magH = abs(H);
    phaH = unwrap(angle(H));
    plot(w/(2*pi),20*log10(magH));
    xlabel('Frequency(Hz)');
    ylabel('Magnidute(dB)');
    title('橢圓高通濾波器')
    grid on
end
% --- Executes on button press in pushbutton2.function pushbutton2_Callback(hObject, eventdata, handles)% hObject    handle to pushbutton2 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)close
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