Let me ask my question in that way: assume that we have function which is sum of two different sinusoids. We have the sum function so how can we find the frequencies of added sinusoidals?
DTMF : Determining the pressed button on a phone
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hey, I have a question that should be solved by MATLAB. I have a .wav file which consists of sound of the dialed phone buttons. Firstly, we should read that .wav file by wavread. And then we have to find the dialed numbers using MATLAB... How can I do that?
Accepted Answer
Paulo Silva
on 5 Mar 2011
doc fft
If you have many combinations of frequencies you must first separate the wav file in pieces and analyse each one with the example code you see in the fft documenation, for each combination of two frequencies you will see two big spikes on the graph, the value in x axis is their frequency.
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