二、数字信号处理系统简介

理论知识参考文献:基于GUI的《数字信号处理》教学演示系统的设计

基于Matlab GUI界面的数字信号处理辅助教学系统

基于MATLAB的数字信号处理实验平台

三、部分源代码

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

% Last Modified by GUIDE v2.5 08-Jul-2020 22:07:09

% Begin initialization code - DO NOT EDIT
global y;
global z;
global mix;
global t;
global amp;
global fre;
global nak;
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @main_OpeningFcn, ...
'gui_OutputFcn', @main_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 main is made visible.
function main_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 main (see VARARGIN)

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

% Update handles structure
guidata(hObject, handles);

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


% --- Outputs from this function are returned to the command line.
function varargout = main_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 amp_edit_CreateFcn(hObject, eventdata, handles)
% hObject handle to amp_edit (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 amp_edit_Callback(hObject, eventdata, handles)
global amp;
amp=str2num(get(handles.amp_edit,'String'));
% hObject handle to amp_edit (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 amp_edit as text
% str2double(get(hObject,'String')) returns contents of amp_edit as a double


% --- Executes during object creation, after setting all properties.
function fre_edit_CreateFcn(hObject, eventdata, handles)

% hObject handle to fre_edit (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 fre_edit_Callback(hObject, eventdata, handles)
global fre;
fre=str2num(get(handles.fre_edit,'String'));
% hObject handle to fre_edit (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 fre_edit as text
% str2double(get(hObject,'String')) returns contents of fre_edit as a double


% --- Executes on button press in sin_button.
function sin_button_Callback(hObject, eventdata, handles)
global y;
global t;
global amp;
global fre;
global nak;
amp=str2num(get(handles.amp_edit,'String'));
fre=str2num(get(handles.fre_edit,'String'));
nak=50*fre;
t=0:1/nak:15;
y=zeros(length(t),length(amp),length(fre));
cla;
for k=1:length(amp)
for j=1:length(fre)
for i=1:length(t)
y(i,k,j)=amp(k)*sin(2*pi*fre(j).*t(i));
end
findobj('tag','sig_axes');
plot(t, y(:,k,j),'parent',handles.sig_axes);
end
end


% hObject handle to sin_button (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)


% --- Executes on button press in tri_button.
function tri_button_Callback(hObject, eventdata, handles)
global y;
global t;
global amp;
global fre;
global nak;
amp=str2num(get(handles.amp_edit,'String'));
fre=str2num(get(handles.fre_edit,'String'));
nak=50*fre;
t=0:1/nak:15;
y=zeros(length(t),length(amp),length(fre));
cla;

for k=1:length(amp)
for j=1:length(fre)
pe=1/fre(j);
NUM=15*fre(j);
for i=1:length(t)
for l=1:NUM
%for l=0:(15*fre(j)-1)
% if (t(i)>=l/fre(j) && t(i)<=(l/fre(j)+1/(2*fre(j))))
if (t(i)>=(l-1)*pe && t(i)<=(l-1)*pe+pe/2)
y(i,k,j)=2*amp(k)/pe*t(i)-2*amp(k)*(l-1);
%y(i)=amp(k)*2*fre(j)*t(i)-2*l*amp(k);
else if (t(i)<=l*pe && t(i)>=(l-1)*pe+pe/2)
y(i,k,j)=-2*amp(k)/pe*t(i)+2*amp(k)*l;
%y(i)=-amp(k)*2*fre(j)*t(i)+2*l*amp(k);
% end
end
end
end
end
% y(:,k,j)=amp(k)*sin(2*pi*fre(j).*t);
findobj('tag','sig_axes');
plot(t, 2*y(:,k,j)-amp,'parent',handles.sig_axes);
end
end

四、运行结果

【数字信号处理】基于matlab GUI数字信号处理系统【含Matlab源码 1088期】_数字信号处理

五、matlab版本及参考文献

1 matlab版本

2014a

2 参考文献

[1] 沈再阳.精通MATLAB信号处理[M].清华大学出版社,2015.

[2]高宝建,彭进业,王琳,潘建寿.信号与系统——使用MATLAB分析与实现[M].清华大学出版社,2020.

[3]王文光,魏少明,任欣.信号处理与系统分析的MATLAB实现[M].电子工业出版社,2018.

[4]高彦彦,张晶,李莉,贾英茜.基于GUI的《数字信号处理》教学演示系统的设计[J].教育教学论坛. 2019,(48)

[5]李俊,张淑玲,帅晶.基于Matlab GUI界面的数字信号处理辅助教学系统[J].信息通信. 2020,(08)

[6]朱御康.基于MATLAB的数字信号处理实验平台[J].通信电源技术. 2021,38(03)