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function DTMF_OpeningFcn(hObject, eventdata, handles, varargin)
modelName = gcs;CCS_Obj = connectToCCS(modelName);
% Identify RTDX channel names/modeschan_struct(1).name = 'OutputDigit';
chan_struct(1).mode = 'r';handles.RTDX_chan1=chan_struct(1);
% Identify RTDX host buffer parameters
RTDX_config_struct.Buffsize= 32768;RTDX_config_struct.Nbuffers = 4;
RTDX_config_struct.Mode = 'continuous';CodegenDir = fullfile(pwd, ['DTMF_RT' '_c6000_rtw']);OutFile = fullfile(CodegenDir, ['DTMF_RT' '.out']);%Load is needed for RTDX setup
CCS_Obj.load(OutFile,20);% Set up RTDX
r = setupRTDX(CCS_Obj, chan_struct, RTDX_config_struct);handles.pipe=r;
handles.CCS_Obj=CCS_Obj;handles.output = hObject;
CCS_Obj.run;% Enable all RTDX channels
r.enable('all');%The buffer that stores the user input digits
A=[];
handles.A=A;% flag that tells if the gui needs to clear the dialed string or
%the next digit joins the previous string:handles.initFlag=0;
handles.maxSize=11;handles.freqTable=generateTable();
% Update handles structureguidata(hObject, handles);
This function will run after activating the GUI. It will then load the DSK, initialize the RTDX interface, and initialize a table of samples for each digit, by calling the generateTable auxiliary function:
function res=generateTable()
t=(1:256*6)/8192;res(1,:)=sin(2*pi*697*t)+sin(2*pi*1209*t);
res(2,:)=sin(2*pi*697*t)+sin(2*pi*1336*t);res(3,:)=sin(2*pi*697*t)+sin(2*pi*1477*t);
res(4,:)=sin(2*pi*770*t)+sin(2*pi*1209*t);res(5,:)=sin(2*pi*770*t)+sin(2*pi*1336*t);
res(6,:)=sin(2*pi*770*t)+sin(2*pi*1477*t);res(7,:)=sin(2*pi*852*t)+sin(2*pi*1209*t);
res(8,:)=sin(2*pi*852*t)+sin(2*pi*1336*t);res(9,:)=sin(2*pi*852*t)+sin(2*pi*1477*t);
res(10,:)=sin(2*pi*941*t)+sin(2*pi*1209*t);res(11,:)=sin(2*pi*941*t)+sin(2*pi*1336*t);
res(12,:)=sin(2*pi*941*t)+sin(2*pi*1477*t);
function handleButton(hObject,handles,k)
%get the digits bufferA=handles.A;
%if we have to erase so we are doing it here:if handles.initFlag==1
handles.initFlag=0;A=[];end
%check if the string is too long with the new digit:if length(A)==handles.maxSize
fprintf('Error: too many digits\n');return;
end%concatenate the new digit to the existing buffer
A=[A k];
handles.A=A;set(handles.text1, 'String', strrep(strrep(strrep(int2str(A),'10','*'),'11','0'),'12','#'));
guidata(hObject,handles);% invoked when the user dials '1':function pushbutton1_Callback(hObject, eventdata, handles)
handleButton(hObject,handles,1);% invoked when the user dials '2':
function pushbutton2_Callback(hObject, eventdata, handles)handleButton(hObject,handles,2);
. . .
This function will be activated, every time the user pushes a digit button in the keypad. The digit will be displayed under the “Dialed Digits” label.
%input: digits and handle to the signals table
%output: buffer that contains the DTMF samples for the digits.function res=buildXmt(handles,A)
res=[];
for k=1 : length(A)freqTable=handles.freqTable;
%place the next digit and then zeros (space)res=[res freqTable(A(k),:) zeros(1,256*6);];end%The Send Button Handler:
function pushbutton13_Callback(hObject, eventdata, handles)r=handles.pipe;
A=handles.A;padding=0;
if length(A)==0return
end% if dialed less than 11 digits pad to 11 digits
if length(A)<11
padding=11-length(A);A=[A ones(1,11-length(A))];end
%build the Send Bufferxmt=0.5*buildXmt(handles,A);
%Transmit DTMF signals buffersound(xmt,8192)
%Wait for end of detectionpause(4)
%read the digits from the rtdx:num_of_msgs = msgcount(r,'OutputDigit');
r.flush('OutputDigit',num_of_msgs-1);y=r.readmsg(handles.rtdx_chan1.name, 'double',1);
y=y(1:end-padding);%Update the upper label with the digits read from dsk estimationset(handles.text4, 'String', strrep(strrep(strrep(int2str(y),'10','*'),'11','#'),'20','*'));
handles.initFlag=1;guidata(hObject, handles);
It will generate the DTMF samples Buffer, based on the “User Dialed” information. The samples will be sent to the sound-card. The program will then monitor the RTDX channel to receive the digits reported by the DSK.
% Delete one digit.
function pushbutton14_Callback(hObject, eventdata, handles)A=handles.A;
if length(A)==0return
endA=A(1:end-1);
set(handles.text1, 'String', strrep(strrep(strrep(int2str(A),'10','*'),'11','0'),'12','#'));handles.A=A;
guidata(hObject, handles);%Clear all the dialed digits.
function pushbutton15_Callback(hObject, eventdata, handles)A=handles.A;
A=[];
set(handles.text1, 'String',strrep(strrep(strrep(int2str(A),'10','*'),'11','0'),'12','#'));
handles.A=A;guidata(hObject, handles);
The system used to run this example is shown in Figure 7.
Activate the GUI (DTMF.fig). Enter an array of digits and compare them to those detected by the DSK.
The original algorithm (simulation) runs in a "noiseless" environment. You are invited to check the performance of the real-time model, and eventually change the algorithm to reduce its sensitivity to noise.
You may also add new buttons for DTMF parameters (level, frequency deviation, etc …), and test the DTMF receiver performance against these parameters.
MATLAB and Simulink are registered trademarks of The MathWorks, Inc. See www.mathworks.com/trademarks for a list of additional trademarks. Other product or brand names may be trademarks or registered trademarks of their respective holders.
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