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Encoder + decoder

COMSATS Abbottabad, profile picture
COMSATS Abbottabad

This document contains MATLAB code for encoding and decoding DTMF tones. It includes functions to: - Generate DTMF tones by combining two sinusoids - Add noise and take the FFT to simulate a received signal - Filter the signal to identify the two frequencies present - Map the frequencies to the corresponding DTMF digit The code contains callbacks to generate all 16 possible DTMF tones and displays the input signal and filtered FFT. It also includes functions to design lowpass and highpass filters used in the decoding process.

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Syed Abuzar Page 1 Encoder and Decoder using MATLAB If u want help regarding this feel free to contact 03129926454 1st Program: function varargout = Decodeeer(varargin) gui_Singleton = 1; gui_State = struct('gui_Name', mfilename, ... 'gui_Singleton', gui_Singleton, ... 'gui_OpeningFcn', @Decodeeer_OpeningFcn, ... 'gui_OutputFcn', @Decodeeer_OutputFcn, ... 'gui_LayoutFcn', [] , ...
Syed Abuzar Page 2 '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 function Decodeeer_OpeningFcn(hObject, eventdata, handles, varargin) handles.output = hObject; guidata(hObject, handles); function varargout = Decodeeer_OutputFcn(hObject, eventdata, handles) varargout{1} = handles.output; function one_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=697; f_high=1209; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H));
Syed Abuzar Page 3 title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); %it is function which store the input from a function and it can be used in other functions. y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function two_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=697; f_high=1336; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid;
Syed Abuzar Page 4 x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function three_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=697; f_high=1477; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N);
Syed Abuzar Page 5 H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function four_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=770; f_high=1209; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid;
Syed Abuzar Page 6 xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function five_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=770; f_high=1336; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r)
Syed Abuzar Page 7 function six_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=770; f_high=1477; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function seven_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1;
Syed Abuzar Page 8 N=5000; f_low=852; f_high=1209; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function eight_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=852; f_high=1336; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t);
Syed Abuzar Page 9 y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function nine_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=852; f_high=1477; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N);
Syed Abuzar Page 10 H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function staric_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=941; f_high=1209; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)');
Syed Abuzar Page 11 ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function zero_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=941; f_high=1336; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); %it is function which store the input from a function and it can be used in other functions.
Syed Abuzar Page 12 y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function hash_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=941; f_high=1477; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2);
Syed Abuzar Page 13 plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function noise_Callback(hObject, eventdata, handles) x=str2double(get(handles.noise, 'String' )); setappdata(0,'Noise',x); function noise_CreateFcn(hObject, eventdata, handles) if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor','white'); end function info_Callback(hObject, eventdata, handles) msgbox('File was created by : Syed Abuzar Comsats Abbottabad Reg # SP15-BEE-096 Submitted To : Mam Rabya','Info','warn') function Close_Callback(hObject, eventdata, handles) close; 2nd Program: function output = filtered(y) fs=8000; N=5000; Hd1=lowpass_filter; x1=filter(Hd1,y); x1 = fft(x1,N); [~,m1] = max(abs(x1));
Syed Abuzar Page 14 m1=m1*1.6; % disp('max1') % disp(m1) Hd2=highpass_filter; x2=filter(Hd2,y); x2 = fft(x2,N); [~,m2] = max(abs(x2)); m2=m2*1.6; % disp('max2') % disp(m2) % L=[697,770,852,941]; % H=[1209,1336,1477]; if ((m1>692) && (m1<720)) m1=697; elseif ((m1>765) && (m1<800)) m1=770; elseif ((m1>847) && (m1<880)) m1=852; elseif ((m1>936) && (m1<960)) m1=941; end % disp(m1) if ((m2>1204) && (m2<1240)) m2=1209; elseif ((m2>1331) && (m2<1360)) m2=1336; elseif ((m2>1472) && (m2<2500)) m2=1477; end
Syed Abuzar Page 15 % disp(m2) j=m1; k=m2; if j<=697 & k<=1209; key = '1'; elseif j<=697 & k<=1336; key = '2'; elseif j<=697 & k<=1477; key = '3'; elseif j<=770 & k<=1209; key = '4'; elseif j<=770 & k<=1336; key = '5'; elseif j<=770 & k<=1477; key = '6'; elseif j<=852 & k<=1209; key = '7'; elseif j<=852 & k<=1336; key = '8'; elseif j<=852 & k<=1477; key = '9'; elseif j<=941 & k<=1209; key = '*'; elseif j<=941 & k<=1336; key = '0'; elseif j<=941 & k<=1477; key = '#'; else key= 'very noisy signal' ; end output=key; end
Syed Abuzar Page 16 3rd Program: function Hd = lpfilter ]Fs = 8000; % Sampling Frequency Fpass = 980; % Passband Frequency Fstop = 1000; % Stopband Frequency Dpass = 0.99980002; % Passband Ripple Dstop = 0.0001; % Stopband Attenuation dens = 20; % Density Factor % Calculate the order from the parameters using FIRPMORD. [N, Fo, Ao, W] = firpmord([Fpass, Fstop]/(Fs/2), [1 0], [Dpass, Dstop]); % Calculate the coefficients using the FIRPM function. b = firpm(N, Fo, Ao, W, {dens}); Hd = dfilt.dffir(b); % [EOF] 4rth Program: function Hd = highpass_filter Fs = 8000; % Sampling Frequency Fstop = 1100; % Stopband Frequency Fpass = 1130; % Passband Frequency Dstop = 0.0001; % Stopband Attenuation Dpass = 0.99980002; % Passband Ripple dens = 20; % Density Factor
Syed Abuzar Page 17 % Calculate the order from the parameters using FIRPMORD. [N, Fo, Ao, W] = firpmord([Fstop, Fpass]/(Fs/2), [0 1], [Dstop, Dpass]); % Calculate the coefficients using the FIRPM function. b = firpm(N, Fo, Ao, W, {dens}); Hd = dfilt.dffir(b); % [EOF]

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Encoder + decoder

  • 1. Syed Abuzar Page 1 Encoder and Decoder using MATLAB If u want help regarding this feel free to contact 03129926454 1st Program: function varargout = Decodeeer(varargin) gui_Singleton = 1; gui_State = struct('gui_Name', mfilename, ... 'gui_Singleton', gui_Singleton, ... 'gui_OpeningFcn', @Decodeeer_OpeningFcn, ... 'gui_OutputFcn', @Decodeeer_OutputFcn, ... 'gui_LayoutFcn', [] , ...
  • 2. Syed Abuzar Page 2 '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 function Decodeeer_OpeningFcn(hObject, eventdata, handles, varargin) handles.output = hObject; guidata(hObject, handles); function varargout = Decodeeer_OutputFcn(hObject, eventdata, handles) varargout{1} = handles.output; function one_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=697; f_high=1209; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H));
  • 3. Syed Abuzar Page 3 title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); %it is function which store the input from a function and it can be used in other functions. y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function two_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=697; f_high=1336; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid;
  • 4. Syed Abuzar Page 4 x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function three_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=697; f_high=1477; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N);
  • 5. Syed Abuzar Page 5 H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function four_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=770; f_high=1209; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid;
  • 6. Syed Abuzar Page 6 xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function five_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=770; f_high=1336; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r)
  • 7. Syed Abuzar Page 7 function six_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=770; f_high=1477; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function seven_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1;
  • 8. Syed Abuzar Page 8 N=5000; f_low=852; f_high=1209; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function eight_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=852; f_high=1336; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t);
  • 9. Syed Abuzar Page 9 y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function nine_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=852; f_high=1477; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N);
  • 10. Syed Abuzar Page 10 H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function staric_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=941; f_high=1209; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)');
  • 11. Syed Abuzar Page 11 ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function zero_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=941; f_high=1336; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); %it is function which store the input from a function and it can be used in other functions.
  • 12. Syed Abuzar Page 12 y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2); plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function hash_Callback(hObject, eventdata, handles) clc fs=8000; t=0:1/fs:0.1; N=5000; f_low=941; f_high=1477; y1=sin(2*pi*f_low*t); y2=sin(2*pi*f_high*t); y=y1+y2; wavplay(y,fs); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y,N)); axes(handles.axes1); plot(w,abs(H)); title('DTMF Input');xlabel('f(Hz)'); ylabel('Amplitude');grid; x=getappdata(0,'Noise'); y1=awgn(y,x); w=linspace(-fs/2,fs/2,N); H=fftshift(fft(y1,N)); axes(handles.axes2);
  • 13. Syed Abuzar Page 13 plot(w,abs(H), 'r'); title('FFT ');grid; xlabel('f(Hz)');ylabel('Amplitude'); r=filtered(y1); disp(r) function noise_Callback(hObject, eventdata, handles) x=str2double(get(handles.noise, 'String' )); setappdata(0,'Noise',x); function noise_CreateFcn(hObject, eventdata, handles) if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor','white'); end function info_Callback(hObject, eventdata, handles) msgbox('File was created by : Syed Abuzar Comsats Abbottabad Reg # SP15-BEE-096 Submitted To : Mam Rabya','Info','warn') function Close_Callback(hObject, eventdata, handles) close; 2nd Program: function output = filtered(y) fs=8000; N=5000; Hd1=lowpass_filter; x1=filter(Hd1,y); x1 = fft(x1,N); [~,m1] = max(abs(x1));
  • 14. Syed Abuzar Page 14 m1=m1*1.6; % disp('max1') % disp(m1) Hd2=highpass_filter; x2=filter(Hd2,y); x2 = fft(x2,N); [~,m2] = max(abs(x2)); m2=m2*1.6; % disp('max2') % disp(m2) % L=[697,770,852,941]; % H=[1209,1336,1477]; if ((m1>692) && (m1<720)) m1=697; elseif ((m1>765) && (m1<800)) m1=770; elseif ((m1>847) && (m1<880)) m1=852; elseif ((m1>936) && (m1<960)) m1=941; end % disp(m1) if ((m2>1204) && (m2<1240)) m2=1209; elseif ((m2>1331) && (m2<1360)) m2=1336; elseif ((m2>1472) && (m2<2500)) m2=1477; end
  • 15. Syed Abuzar Page 15 % disp(m2) j=m1; k=m2; if j<=697 & k<=1209; key = '1'; elseif j<=697 & k<=1336; key = '2'; elseif j<=697 & k<=1477; key = '3'; elseif j<=770 & k<=1209; key = '4'; elseif j<=770 & k<=1336; key = '5'; elseif j<=770 & k<=1477; key = '6'; elseif j<=852 & k<=1209; key = '7'; elseif j<=852 & k<=1336; key = '8'; elseif j<=852 & k<=1477; key = '9'; elseif j<=941 & k<=1209; key = '*'; elseif j<=941 & k<=1336; key = '0'; elseif j<=941 & k<=1477; key = '#'; else key= 'very noisy signal' ; end output=key; end
  • 16. Syed Abuzar Page 16 3rd Program: function Hd = lpfilter ]Fs = 8000; % Sampling Frequency Fpass = 980; % Passband Frequency Fstop = 1000; % Stopband Frequency Dpass = 0.99980002; % Passband Ripple Dstop = 0.0001; % Stopband Attenuation dens = 20; % Density Factor % Calculate the order from the parameters using FIRPMORD. [N, Fo, Ao, W] = firpmord([Fpass, Fstop]/(Fs/2), [1 0], [Dpass, Dstop]); % Calculate the coefficients using the FIRPM function. b = firpm(N, Fo, Ao, W, {dens}); Hd = dfilt.dffir(b); % [EOF] 4rth Program: function Hd = highpass_filter Fs = 8000; % Sampling Frequency Fstop = 1100; % Stopband Frequency Fpass = 1130; % Passband Frequency Dstop = 0.0001; % Stopband Attenuation Dpass = 0.99980002; % Passband Ripple dens = 20; % Density Factor
  • 17. Syed Abuzar Page 17 % Calculate the order from the parameters using FIRPMORD. [N, Fo, Ao, W] = firpmord([Fstop, Fpass]/(Fs/2), [0 1], [Dstop, Dpass]); % Calculate the coefficients using the FIRPM function. b = firpm(N, Fo, Ao, W, {dens}); Hd = dfilt.dffir(b); % [EOF]