How can i do detection in DTMF ? i want to enter a tone and get the numbers of it
i want to enter a tone and get the numbers that consist it ….
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I had to kludge it a bit because there are problems getting good time separation as well as good frequency separation, but — other than producing duplicate results — this works and gives reasonable answers. You will likely want to experiment with it. It is quite likely not robust, and may only work with the file you sent. (I left the spectrogram plot in but commented it out. Un-comment it if you want to see what it does.) The ‘TL’ and ‘TH’ vectors seem to make no sense in the context of the length of the signal and the sampling frequency, since your entire signal is only about 3.63 seconds in length
The code:
dtmf_tones = load('Eng Abeer dtmf.mat');
xr = dtmf_tones.R;
fs = dtmf_tones.fs;
x = xr - mean(xr); % Remove d-c Component[S,F,T] = spectrogram(x, 1536, 64, 512, fs, 'yaxis');% Fm = repmat(F, 1, length(T));
% Tm = repmat(T, length(F), 1);
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