gmguifs.m

数字信号处理：1.卷积 2.抽样 3.滤波器

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

% Last Modified by GUIDE v2.5 10-Jan-2008 12:16:46

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @GMGUIFs_OpeningFcn, ...
                   'gui_OutputFcn',  @GMGUIFs_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 GMGUIFs is made visible.
function GMGUIFs_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 GMGUIFs (see VARARGIN)

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

% Update handles structure
guidata(hObject, handles);

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


% --- Outputs from this function are returned to the command line.
function varargout = GMGUIFs_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 slider1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to slider1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: slider controls usually have a light gray background, change
%       'usewhitebg' to 0 to use default.  See ISPC and COMPUTER.
usewhitebg = 1;
if usewhitebg
    set(hObject,'BackgroundColor',[.9 .9 .9]);
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end


% --- Executes on slider movement.
function slider1_Callback(hObject, eventdata, handles)
% hObject    handle to slider1 (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,'Value') returns position of slider
%        get(hObject,'Min') and get(hObject,'Max') to determine range of slider
set(handles.edit1,'String',num2str(get(hObject,'Value')));
if get(hObject,'Value')<100
    set(handles.edit2,'String','欠采样');
else
    if get(hObject,'Value')==100
        set(handles.edit2,'String','理想采样');
    else
        set(handles.edit2,'String','过采样');
    end
end  

% --- 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'));
end



function 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 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)

fs=get(handles.slider1,'value');
t0=[fliplr(0:-1/10000:-0.2),1/10000:1/10000:0.2];
t=[fliplr(0:-1/fs:-0.2),1/fs:1/fs:0.2];
F=2.5;
fc=50;
y0=fc*(sin(pi*fc*t0+eps)./(pi*fc*t0+eps)).^2;
y=fc*(sin(pi*fc*t+eps)./(pi*fc*t+eps)).^2;
Y0=fft(y0);
Y=fft(y);
Y1=abs(Y0)/max(abs(Y0));
Y2=abs(Y)/max(abs(Y));
axes(handles.axes1),plot(t0,y0);
title('时域连续信号波形');
xlabel('t(s)');
axes(handles.axes2),plot(F*(-2000:2000),fftshift(Y1));
axis([-500 500 0 1]);
title('时域连续信号频谱');
xlabel('f(Hz)');
set(handles.axes2,'Xtick',[-500 -50 50 500]);
axes(handles.axes3),stem(t,y,'.');
title('时域采样信号波形');
xlabel('t(s)');
axes(handles.axes4),plot(F/fs*((1-8*length(t))/2:(8*length(t)-1)/2),repmat(Y2,1,8));
axis([-3 3 0 max(Y2)]);
title('归一化的频域采样信号频谱');
xlabel('f/fs');
set(handles.axes4,'Xtick',[-2:2]);

% --- 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'));
end



function 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