DTMF tone using matlab

can anyone tell me how to implement DTMF tone using matlab and i have to listen the tone

[KSSV]

http://in.mathworks.com/matlabcentral/answers/?term=tag:%22dtmf%22

[Deema Hani]

xK(t)=sin(2*3.4ft)+sin(2*3.4gt),

0<=t<=Td

1) Develop a function namde ss_(..)to produce the signal for one digit.The synatax of the function should be

x=ss_dtmf(n,t)

Answer 1

[pavan chillapur]

symbol = {'1','2','3','4','5','6','7','8','9','*','0','#'};
lfg = [697 770 852 941]; % Low frequency group
hfg = [1209 1336 1477];  % High frequency group
f  = [];
for c=1:4,
    for r=1:3,
        f = [ f [lfg(c);hfg(r)] ];
    end
end
Fs  = 8000;       % Sampling frequency 8 kHz
N = 800;          % Tones of 100 ms
t   = (0:N-1)/Fs; % 800 samples at Fs
pit = 2*pi*t;

tones = zeros(N,size(f,2));
for toneChoice=1:12,
    % Generate tone
    tones(:,toneChoice) = sum(sin(f(:,toneChoice)*pit))';
    % Plot tone
    subplot(4,3,toneChoice),plot(t*1e3,tones(:,toneChoice));
    title(['Symbol "', symbol{toneChoice},'": [',num2str(f(1,toneChoice)),',',num2str(f(2,toneChoice)),']'])
    set(gca, 'Xlim', [0 25]);
    ylabel('Amplitude');
    if toneChoice>9, xlabel('Time (ms)'); end
end
set(gcf, 'Color', [1 1 1], 'Position', [1 1 1280 1024])
annotation(gcf,'textbox', 'Position',[0.38 0.96 0.45 0.026],...
    'EdgeColor',[1 1 1],...
    'String', '\bf Time response of each tone of the telephone pad', ...
    'FitBoxToText','on');

[mohit saxena]

on executing this program we are able to get the plot of time response of each tone of telephone pad but unable to get listen the tone. Furthermore how can I verify the obtained waveforms?

[Divyanshu Singh]

The coding provided by Pavan has many errors in it... I'll send the correct code...

[Divyanshu Singh]

if true
  % code
end
symbol = {'1','2','3','4','5','6','7','8','9','*','0','#'};
lfg = [697, 770, 852, 941];
hfg = [1209, 1336, 1477];
f = [];
for c = 1:4
  for r = 1:3
      f = [f [lfg(c); hfg(r)]];
  end
end
Fs = 8000;
N = 800;
t = (0:N-1)/Fs;
pit = 2*pi*t;
tones = zeros(N, size(f,2));
for toneChoice = 1:12
  tones(:,toneChoice) = sum(sin(f(:,toneChoice)*pit));
  subplot(4,3,toneChoice);
  plot(t*1e3,tones(:,toneChoice));
  title(['Symbol " ', symbol{toneChoice}, ' "']);
  [num2str(f(1,toneChoice))];
  [num2str(f(2,toneChoice))];
  set(gca, 'Xlim', [0, 25]);
  ylabel('Amplitude');
  if toneChoice>9
      xlabel('Time (ms)');
  end
end
set(gcf, 'Color', [1, 1, 1], 'Position', [1, 1,1280, 1024]);
annotation(gcf, 'textbox', 'Position', [0.38, 0.96, 0.45, 0.026], 'EdgeColor', [1, 1, 1], 'String', '\bf Time response of each tone of the telephone pad', 'FitboxToText', 'on');

[VIJAY CHANDRA]

how to execute the code in matlab

[Muhammet Furkan Nargül]

Thank you!

[EHTEZAZ ALI HASSAN]

no sound man

[ammar ansari]

For sound you can use the code

keypad = tones(:,5),Fs,16; % 5 is button pressed on keypad
sound(keypad)

If multiple button on keypad are pressed like (5086477000) then

for i = [5 11 8 6 4 7 7 11 11 11]
p = audioplayer(tones(:,i),Fs,16);
play(p)
pause(0.5)
end