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A doubt in DTMF decoder-Problem

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swetha.incore

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Hello,

I am working on a DTMF encoder-Decoder. I am decoding according to the steps given by my proffesor. For decoding I am supposed to follow these steps:
1. DTMF_signal i.e the Tone and the sample frequency Fs as input.
2. Fourier transform it using freqz().
3.Find the peaks of the magnitude and the corresponding frequency in DT.
4. Find the continuous frequency using Fs.

I did freqz(signal), and then i found the maximum and minimum of the magnitude, and the corresponding indices. Now these indices will be my frequencies in DT.

I dont know how to find the continuous frequencies. How do i do it?
-swetha
 

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