DTMF tone using matlab

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PHANI KUMAR.N
PHANI KUMAR.N 2016-10-3
评论： Deema Hani 2022-1-4
can anyone tell me how to implement DTMF tone using matlab and i have to listen the tone
  2 个评论
Deema Hani
Deema Hani 2022-1-4
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)

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pavan chillapur
pavan chillapur 2016-10-3
编辑：Stephen23 2016-10-3
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');
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ammar ansari
ammar ansari 2021-6-19
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

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