exp3_1.m

一个带界面的信号与系统实验系统

function varargout = Exp1_1(varargin)
% EXP3_1 Application M-file for Exp1_1.fig
%    FIG = EXP3_1 launch Exp1_1 GUI.
%    EXP3_1('callback_name', ...) invoke the named callback.

% Last Modified by GUIDE v2.5 13-Jun-2008 10:19:52

if nargin == 0  % LAUNCH GUI

	fig = openfig(mfilename,'reuse');

	% Generate a structure of handles to pass to callbacks, and store it. 
	handles = guihandles(fig);
	guidata(fig, handles);

	if nargout > 0
		varargout{1} = fig;
	end

elseif ischar(varargin{1}) % INVOKE NAMED SUBFUNCTION OR CALLBACK

	try
		if (nargout)
			[varargout{1:nargout}] = feval(varargin{:}); % FEVAL switchyard
		else
			feval(varargin{:}); % FEVAL switchyard
		end
	catch
		disp(lasterr);
	end

end


%| ABOUT CALLBACKS:
%| GUIDE automatically appends subfunction prototypes to this file, and 
%| sets objects' callback properties to call them through the FEVAL 
%| switchyard above. This comment describes that mechanism.
%|
%| Each callback subfunction declaration has the following form:
%| <SUBFUNCTION_NAME>(H, EVENTDATA, HANDLES, VARARGIN)
%|
%| The subfunction name is composed using the object's Tag and the 
%| callback type separated by '_', e.g. 'slider2_Callback',
%| 'figure1_CloseRequestFcn', 'axis1_ButtondownFcn'.
%|
%| H is the callback object's handle (obtained using GCBO).
%|
%| EVENTDATA is empty, but reserved for future use.
%|
%| HANDLES is a structure containing handles of components in GUI using
%| tags as fieldnames, e.g. handles.figure1, handles.slider2. This
%| structure is created at GUI startup using GUIHANDLES and stored in
%| the figure's application data using GUIDATA. A copy of the structure
%| is passed to each callback.  You can store additional information in
%| this structure at GUI startup, and you can change the structure
%| during callbacks.  Call guidata(h, handles) after changing your
%| copy to replace the stored original so that subsequent callbacks see
%| the updates. Type "help guihandles" and "help guidata" for more
%| information.
%|
%| VARARGIN contains any extra arguments you have passed to the
%| callback. Specify the extra arguments by editing the callback
%| property in the inspector. By default, GUIDE sets the property to:
%| <MFILENAME>('<SUBFUNCTION_NAME>', gcbo, [], guidata(gcbo))
%| Add any extra arguments after the last argument, before the final
%| closing parenthesis.



% --------------------------------------------------------------------
function varargout = pushbutton7_Callback(h, eventdata, handles, varargin)
f = str2double(get(handles.edit1,'String'));
fm = 1000;
N = 1024;
n = 0:N-1;
x2 = n/fm;
val1 = get(handles.popupmenu1,'Value');
switch val1
case 1
    x = -0.04:0.001:0.04;
    y1 = sin(2*pi*f*x);
    y2 = sin(2*pi*f*x2);
case 2
    x = -0.06:0.0001:0.06;
    y1 = square(2*pi*f*x,50);
    y2 = square(2*pi*f*x2,50);
case 3
    x = -0.15:0.001:0.15;
    y1 = sawtooth(2*pi*f*x);
    y2 = sawtooth(2*pi*f*x2);
case 4
    x = [-5:0.01:5];
    y1 = [(x-0) >= 0];
case 5
    x = [-5:0.01:5];
    y1 = [(x-0) == 0];
case 6
    x = [-2:0.01:2];
    y1 = sinc(f*pi*x);
otherwise
    y1 = 0;
end

axes(handles.axes1) % Select the proper axes
plot(x,y1,'-r')
set(handles.axes1,'XMinorTick','on')
title('时域波形');
grid on

y = fft(y2,N);
mag = abs(y);
fs=(0:length(y)-1)'*fm/length(y);

axes(handles.axes2) % Select the proper axes
plot(fs,mag,'-b')
axis([0 100 0 300]);
set(handles.axes2,'XMinorTick','on')
title('频域波形');
grid on
% --------------------------------------------------------------------
function varargout = pushbutton8_Callback(h, eventdata, handles, varargin)
close
Exp3


% --- 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



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