“数字信号处理”课程是信息和通信工程专业必修的专业技术基础课程。课程以信号与系统作为研究对象，研究对信号进行各种处理和利用的技术。通过该课程的学习，学生应牢固掌握确定性信号和系统的分析方法、相关算法、系统实现等的相关知识的，借助于数字滤波器的设计及实现，学生可掌握数字系统的分析以及设计方法。 数字信号处理是理论性和工程性都很强的学科，本课程设计的目的就是使该课程的理论与工程应用的紧密结合, 使学生深入理解信号处理的内涵和实质。
本课程设计要求学生在理解信号处理的数学原理的基础上，应用计算机编程手段，实现一种信号分析或处理的设计，达到对所学内容融会贯通，综合各部分知识，按照题目要求设计完成。
二、课程设计的题目和要求
1.课程设计题目：DTMF信号的产生与解码
DTMF编解码广泛应用于数字电话拨号，简单通信协议等领域。目前所有的电话和传真机按键都是采用DTMF信号进行编码和传输的，该方案实际是利用模拟信号对数字符号进行编码。
该编码方案共使用8个模拟频率对16个符号进行编码，这16个频率分为2个群：高音群和低音群。所以称为双音多频(Dual-Tone Multiple-Frequency)编码，其编码方案如图1。由图可知每个符号由一个高音频率和一个低音频率唯一确定。
图1 DTMF信号编码方案
对于该信号的产生，我们可以利用数字振荡器来完成。
而对这些信号的检测，则可以利用DFT来完成。要注意的是，这里只需要计算16个频点的FFT输出，因此课本上介绍基2或基4算法并不是最优的，这时我们需要采用Goerzel算法完成所需的DFT。当然我们也可以用16个窄带带通滤波器完成，窄带带通滤波器的中心频率就是上述各频率。对窄带滤波器输出信号的输出做判决就可以得到解码的结果。
2.设计要求
编制程序生成并显示各符号的时域信号和对应的幅频曲线。
编程模拟电话拨号过程：输入电话号码，生成各号码的时域信号，给时域信号加噪声，编程对含噪声的电话拨号信号进行解码。编制程序测试编解码程序的正确性。要列出表格，统计拨出的符号的解码成功率。
完成设计，选择自己熟悉的编程语言编写程序，最好能给出图形界面。
三、设计过程与结果
1.在MATLAB中建立一个GUI图形界面，将本课程设计所要实现的功能的一些工具拖进GUI界面，并根据需要修改各个工具的属性，建立的初始界面如图2所示。
图2 GUI图形设计的初始界面
2.打开jink.fig界面所对应的源程序编辑窗口，其中MATLAB会自动生成界面的初始化程序代码以及1——D、“解码检测”和“退出”共18个按钮各按钮的函数名和参数功能解释。在这里，我们需要对每个按钮要实现的具体功能编写程序，由于按钮函数较多，且1——D数字按钮的功能相似，故可以编写函数供每个这样的函数调用，从而避免程序的繁杂冗余。例如对于点击数字键“1”时要实现的功能的函数可以为如下代码：
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'1');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'1');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
当运行程序后点击数字键“1”时，pushbutton1_Callback函数会调用PressKeyDown函数，从而完成发出相应的声音、在text1文本框中显示出点击的数字、在axes1和axes2画出对应的图形等功能。
点击几个数字或字母键后，在界面中运行的结果如图3所示。
图3 拨号时界面的显示结果
3.在拨号后，要对所接收的拨号信号进行解码检测，检测两个正弦波的频率分别是多少，以判断所对应的十进制数字或字母符号。检测方法有两种，一是用一组滤波器提取所关心的频率，根据两个滤波器的输出信号判断相应的数字或符号，另一是用DFT（FFT）对双音多频信号进行频谱分析，由信号幅度谱判断信号的两个频率，最后确定相应的数字或符号。本设计所编写的相应的解码部分程序代码如下：
function pushbutton17_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton17 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
handles.DecodeTelNumber=''; %清空解码字符串变量，开始新一轮解码。
keys = ['1','2','3','A';'4','5','6','B';'7','8','9','C';'*','0','#','D'];
for i=1 : length(handles.TelNumber)
Signal = dtmf(handles.TelNumber(i));
RowNumber = FindLowerFreq(Signal);
ColumnNumber = FindHigherFreq(Signal);
ResultKey = keys(RowNumber,ColumnNumber);
handles.DecodeTelNumber=strcat(handles.DecodeTelNumber,ResultKey);
set(handles.DecodeText,'string',handles.DecodeTelNumber);
end
handles.TelNumber=''; %解码完成后，拨号变量清空，方便下一次拨号。
点击“解码检测”按钮，进行解码的运行结果如图4所示。
图4 解码后的结果
由图4可以看出，在解码的文本框中显示出正确的拨号，表示解码正确。点“退出”键后界面关闭退出。
四、课程设计总结
经过几天的努力，我终于完成了基于MATLAB的DTMF信号的产生与解码课程设计，由于刚上完数字信号处理这门课程，对相关的知识还是比较熟悉，但是对于数字信号处理的实质的理解还是不够深刻，因此刚开始不知如何下手，觉得困难比较多，不过最后经过多次修改和整理，还是完成了。受到自己知识水平的，此次课程设计还有很多不足的地方。通过这次课程设计，我发现自己以前关于数字信号处理这门课的看法太片面，课程设计不仅仅是对所学知识的一种检验，更是对自己能力的一种提高，这次课程设计使我明白前面所学的那点知识是非常欠缺的，要学的东西还很多。比如在使用MATLAB制作图形界面上，以前上过这个课程，但没有学其中GUI界面设计部分，这就要求我们去自学。
在这次课程设计中，我遇到过很多问题，发现我所学的知识实在有限，好在同学之间可以相互讨论，还可以充分利用网络去查阅相关资料。在整理与修改的过程中，我学到了很多新的知识，也培养了思考和设计的能力，树立了对知识应用的信心，相信会对以后的学习工作都有很大的帮助，并且提高了自己的动手实践能力。
在这次课程设计的过程中，我得到了许多人的帮助，感谢指导老师耐心的讲解，也感谢在一起讨论的同学，从中我得到了很多好的建议和方法。总之，本次课程设计的过程虽然曲折，但是收获还是蛮大的，这不是对知识的终结，而是我学习更多知识的一个平台。
五、参考文献
1.程耕国，信号与系统，北京：机械工业出版社，2009.4
2.高西全、丁玉美，数字信号处理（第三版），西安：西安电子科技大学出版社，2008.8
3.李正周，MATLAB数字信号处理与应用，北京：清华大学出版社，2008
4.徐明远、刘增力，MATLAB仿真在信号处理中的应用，西安：电子科技大学出版社，2007
5.李显宏，MTALAB7.x界面设计与编译技巧，北京：电子工业出版社，2006
六、附录
源程序代码：
function varargout = jink(varargin)
% JINK MATLAB code for jink.fig
% JINK, by itself, creates a new JINK or raises the existing
% singleton*.
%
% H = JINK returns the handle to a new JINK or the handle to
% the existing singleton*.
%
% JINK('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in JINK.M with the given input arguments.
%
% JINK('Property','Value',...) creates a new JINK or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before jink_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to jink_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 jink
% Last Modified by GUIDE v2.5 01-Jan-2012 13:20:27
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @jink_OpeningFcn, ...
'gui_OutputFcn', @jink_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 jink is made visible.
function jink_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 jink (see VARARGIN)
% Choose default command line output for jink
handles.output = hObject;
handles.DTMFSignal = [];
handles.TelNumber='';
handles.DecodeTelNumber='';%保存解码字符串 变量
set(gcf,'CurrentAxes',handles.axes1);
xlabel('单位：（s）');
set(gcf,'CurrentAxes',handles.axes2);
xlabel('单位：（Hz）');
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes jink wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = jink_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)
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'1');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'1');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
% --- 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)
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'2');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'2');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
% --- 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)
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'3');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'3');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
% --- 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)
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'4');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'4');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
% --- 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)
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'5');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'5');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
% --- 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)
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'6');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'6');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
% --- Executes on button press in pushbutton7.
function pushbutton7_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton7 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'7');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'7');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
% --- Executes on button press in pushbutton8.
function pushbutton8_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton8 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'8');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'8');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
% --- Executes on button press in pushbutton9.
function pushbutton9_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton9 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'9');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'9');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
% --- Executes on button press in pushbutton10.
function pushbutton10_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton10 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'*');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'*');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
% --- Executes on button press in pushbutton11.
function pushbutton11_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton11 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'0');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'0');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
% --- Executes on button press in pushbutton12.
function pushbutton12_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton12 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'#');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'#');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
% --- Executes on button press in pushbutton13.
function pushbutton13_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton13 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'A');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'A');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
% --- Executes on button press in pushbutton14.
function pushbutton14_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton14 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'B');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'B');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
% --- Executes on button press in pushbutton15.
function pushbutton15_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton15 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'C');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'C');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
% --- Executes on button press in pushbutton16.
function pushbutton16_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton16 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
set(handles.DecodeText,'string',''); %清空解码显示文本框
Signal = PressKeyDown(handles,'D');
handles.DTMFSignal = Signal;
handles.TelNumber=strcat(handles.TelNumber,'D');
% Update handles structure
guidata(hObject, handles);
set(handles.CodeText,'string',handles.TelNumber);
% --- Executes on button press in pushbutton17.
function pushbutton17_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton17 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
handles.DecodeTelNumber=''; %清空解码字符串变量，开始新一轮解码。
keys = ['1','2','3','A';'4','5','6','B';'7','8','9','C';'*','0','#','D'];
for i=1 : length(handles.TelNumber)
Signal = dtmf(handles.TelNumber(i));
RowNumber = FindLowerFreq(Signal);
ColumnNumber = FindHigherFreq(Signal);
ResultKey = keys(RowNumber,ColumnNumber);
handles.DecodeTelNumber=strcat(handles.DecodeTelNumber,ResultKey);
set(handles.DecodeText,'string',handles.DecodeTelNumber);
end
handles.TelNumber=''; %解码完成后，拨号变量清空，方便下一次拨号。
% Update handles structure
guidata(hObject, handles);
% RowNumber = FindLowerFreq(handles.DTMFSignal);
% ColumnNumber = FindHigherFreq(handles.DTMFSignal);
% ResultKey = keys(RowNumber,ColumnNumber);
% set(handles.DecodeText,'string',char(ResultKey));
% PressKeyDown.m
function Signal = PressKeyDown(handles,key)
Signal = dtmf(key);
sound(Signal,8000); % 利用声卡播放拨号音
set(gcf,'CurrentAxes',handles.axes1);
NSignal=length(Signal);
t=1/8000:1/8000:NSignal/8000;
plot(t,Signal);grid; % 画信号的时域波形
xlabel('单位：（s）');
Spectrum = fft(Signal);
Spectrum = fftshift(Spectrum); % 计算信号的频谱
N = length(Spectrum); nStep = (2*pi)/(N-1);
w = -pi:nStep:pi;
set(gcf,'CurrentAxes',handles.axes2);
plot(w/(2*pi)*8000,abs(Spectrum));grid; %画信号的频谱图
axis([-2000,2000,0,200]); xlabel('单位：（Hz）');
%dtmf.m
function x = dtmf(key);
fs = 8000; N = 0.1 * fs; %信号时间为100ms,N=Tpmin * Fs ； Tpmin根据频率分辨率得到，DTMF信号的最小频率间隔为73HZ,故至少需要110点
R = 1; fl = 0; fh = 0; n=0:100;
switch key
case {'1','2','3','A'}
fl = 697;
case {'4','5','6','B'}
fl = 770;
case {'7','8','9','C'}
fl = 852;
case {'*','0','#','D'}
fl = 941;
end
switch key
case {'1','4','7','*'}
fh = 1209;
case {'2','5','8','0'}
fh = 1336;
case {'3','6','9','#'}
fh = 1477;
case {'A','B','C','D'}
fh = 1633;
end
x = wav_gener(R,2*pi*fl/fs,N) + wav_gener(R,2*pi*fh/fs,N);
% wav_gener.m
function h = wav_gener(R,omega,N)
% w1 = 0; w2 = 0; delta = zeros(1,N); delta(1) = 1;
% k = R * cos(omega); h = zeros(1,N);
% for n = 1:N
% w0 = delta(n) + 2 * k * w1 -R^2 * w2;
% h(m) = w0 - k * w1; w2 = w1; w1 = w0;
% end
h=zeros(1,N);
for m=1:N
h(m)=R*cos(omega*m);
end
% FindLowerFreq.m
function number = FindLowerFreq(Signal)
Freq = [697,770,852,941]; temp = 0;
for n = 1:length(Freq)
Wo = Freq(n); B = DesignLowerFilter(Wo);%设计带通滤波器，中心频率分别为697Hz,770Hz，852Hz,941Hz，当n=1时，中心频率为697Hz
Out = filter(B,1,Signal);%将要解码的某个拨号，比如‘1’所代表的DTMF信号，通过带通滤波器(n=1时，中心频率为697Hz)，输出保存在Out中
Fout = max(abs(fft(Out))) ; % 计算输出out幅频响应的最大值（n=1时，表示通过中心频率为697Hz的带通滤波器的最大幅频输出值）。
%循环4次就知道，DTMF信号在经过中心频率分别为697Hz,770Hz，852Hz,941Hz的带通滤波器时，
%最大幅频值是经过哪个带通滤波器得到的，则DTMF信号的低频值就是哪一个。
if ( Fout > temp )
number = n; temp = Fout;
end
end
% DesignLowerFilter.m
function B = DesignLowerFilter(Wo)
fs = 8000; N = 400; k = 2*pi/fs; Bandwidth = 70;
wc1 = ( Wo - Bandwidth / 2 ) * k;
wc2 = ( Wo + Bandwidth / 2 ) * k;
B = fir2(N,[0,wc1/pi,wc2/pi,1],[0,1,1,0]);
% FindHigherFreq.m
function number = FindHigherFreq(Signal)
Freq = [1209,1336,1447,1633]; temp = 0;
for n = 1:length(Freq)
Wo = Freq(n); B = DesignHigherFilter(Wo);
Out = filter(B,1,Signal);
Fout = max(abs(fft(Out)));
if ( Fout > temp )
number = n; temp = Fout;
end
end
% DesignHigherFilter.m
function B = DesignHigherFilter(Wo)
fs = 8000; N = 200; k = 2*pi/fs; Bandwidth = 110;
wc1 = ( Wo - Bandwidth / 2 ) * k;
wc2 = ( Wo + Bandwidth / 2 ) * k;
B = fir2(N,[0,wc1/pi,wc2/pi,1],[0,1,1,0]);
% --- Executes on button press in pushbutton18.
function pushbutton18_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton18 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
close(gcf);
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