function varargout = untitled(varargin)
% UNTITLED M-file for untitled.fig
%      UNTITLED, by itself, creates a new UNTITLED or raises the existing
%      singleton*.
%
%      H = UNTITLED returns the handle to a new UNTITLED or the handle to
%      the existing singleton*.
%
%      UNTITLED('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in UNTITLED.M with the given input arguments.
%
%      UNTITLED('Property','Value',...) creates a new UNTITLED or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before untitled_OpeningFunction gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to untitled_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

% Copyright 2002-2003 The MathWorks, Inc.

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

% Last Modified by GUIDE v2.5 27-Apr-2006 20:29:40

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @untitled_OpeningFcn, ...
                   'gui_OutputFcn',  @untitled_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(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 untitled is made visible.
function untitled_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 untitled (see VARARGIN)

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

% Update handles structure
guidata(hObject, handles);

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


% --- Outputs from this function are returned to the command line.
function varargout = untitled_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 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)
N=64;
n=0:63;
t=0.01*n;
q=n*2*pi/N;
x=cos(3*pi/20*t);
                                      %生成信號序列
y=fft(x,N);
subplot(3,1,1);
plot(t,x);
title('source signal');
                                      %繪制源曲線信號
subplot(3,1,2);
plot(q,abs(y));            %幅度譜
title('magnitude');
subplot(3,1,3);
plot(q,angle(y));          %相位譜
title('phase');




% --- 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)
N=128;
n=0:127;
t=0.05*n;
q=n*2*pi/N;
x=cos(3*pi/20*t);
                                      %生成信號序列
y=fft(x,N);
subplot(3,1,1);
plot(t,x);
title('source signal');
                                      %繪制源曲線信號
subplot(3,1,2);
plot(q,abs(y));            %幅度譜
title('magnitude');
subplot(3,1,3);
plot(q,angle(y));          %相位譜
title('phase');




% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
n=[0:1:99];
xn=cos(3*pi/20*n);
                                      %生成信號序列
Xk=fft(xn);
kx=[0:1:length(Xk)-1];
subplot(2,1,1);
stem(n,xn);
title('time domain signal');
                                      %繪制源曲線信號
subplot(2,1,2);
stem(kx,abs(Xk));           
title('frequence domain signal(n=100)');





% --- Executes on button press in pushbutton4.
function pushbutton4_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton4 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
n=[0:1:149];
xn=cos(3*pi/20*n);
                                      %生成信號序列
Xk=fft(xn);
kx=[0:1:length(Xk)-1];
subplot(2,1,1);
stem(n,xn);
title('time domain signal');
                                      %繪制源曲線信號
subplot(2,1,2);
stem(kx,abs(Xk));           
title('frequence domain signal(n=150)');





% --- Executes on button press in pushbutton5.
function pushbutton5_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton5 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
wn=kaiser(length(xn),5.658);
hn=xn.*wn';
Hk=fft(hn);
kh=[0:1:length(Hk)-1];
subplot(2,1,1);
stem(n,xn);
title('time domain signal');
subplot(2,1,2);
stem(kh,abs(Hk));
title('kaiser window(n=100)');





% --- Executes on button press in pushbutton6.
function pushbutton6_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton6 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
n=[0:1:29];
xn=cos(3*pi/20*n);
gn=[xn,zeros(1,30)];
N=length(n);
M=N+30;
m=[0:1:M-1];
Xk=fft(xn,30);
Gk=fft(gn,60);
subplot(2,1,1);
stem(n,abs(Xk));
axis([0,60,0,10]);
subplot(2,1,2);
stem(m,abs(Gk));


% --- Executes during object creation, after setting all properties.
function axes1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to axes1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: place code in OpeningFcn to populate axes1


% --- Executes on mouse press over axes background.
function axes1_ButtonDownFcn(hObject, eventdata, handles)
% hObject    handle to axes1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)