Matlab :detect frequency of dtmf tone (.wav )file

[mohajernow]

a question in MATLAB ?
i have a DTMF tone as a ( .wav ) file and i want to detect
its frequency then i want to know the number which
the tone belong to

note i have a .wav file and i want to detect it


i am trying forrier then using "find function "in matlab
but the result of "find " have a lot of number
what i can do to solve this problem

here is my attempt

[y1,fs,n]=wavread('tone4.wav');
Ts=1/fs
y=fft(y1);
y=Ts*fftshift(y);
freq =find (y)

 

[mohajernow]

i found another way to know the frequency but i do not konw how to use it
the methode depend on finding the frequency which has the highest magnitude

i do not know how to get the highest magnitude

 

[Mene]

Hello,

To detect the frequency of a DTMF tone in a .wav file, you can use the MATLAB function "audioread" to read the file and then use the "fft" function to perform a Fast Fourier Transform on the signal. This will convert the time domain signal into the frequency domain. From there, you can use the "find" function to locate the peaks in the frequency spectrum, which will correspond to the DTMF frequencies.

However, as you mentioned, the "find" function may return a lot of numbers, as there may be multiple frequencies present in the signal. To solve this problem, you can use the "max" function to find the maximum value in the frequency spectrum and then use the "find" function again to locate the index of this maximum value. This index will correspond to the dominant frequency in the signal and can be used to determine the DTMF number.

I hope this helps. Let me know if you have any further questions.