Write code in Matlab a function named "decode_DTMF.m" that takes input a .wav file and returns as output the
number that represents. Particularly use the command in the code "[s, fs]=audioread('secret_number.wav'). For this purpose, the function should implement appropriate filters followed by the appropriate thresholds for the numbers involved in signal s. Explain why you chose these filters and plot their amplitude spectrum.
The frequencies of the numbers are here:
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