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Touch-tone telephones use a dual tone multi frequency (DTMF) scheme to encode key-presses as audio tones: enter image description here

I have a signal containing 10 number tones. I used frequency response to show what frequencies the signal has, but they are affected by noise (I think this is white noise). Can you suggest me a way to cancel this noise to find frequencies of numbers encoded. Here is frequency response of each number in the signal: enter image description here

Example: Frequency response of another signal that doesn't have noise, I can compare and find numbers encoded: enter image description here

My professor gave me two audio data files, one is tones without noise and another is tones with noise. I used DTFT to plot each tone in each file: enter image description here enter image description here

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  • $\begingroup$ How are you generating these responses? Could you add details? $\endgroup$ – jithin Mar 24 '20 at 6:21
  • $\begingroup$ My professor gave me two audio data files, one is tones without noise and another is tones with noise. I used DTFT to generate the responses of each number(tone). I just attached my progarm to generate the reponses in the main post.Thank for response! $\endgroup$ – An Vo Le Mar 24 '20 at 22:17

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