Question: I called someone two days ago, but I cannot remember what number I called. Luckily, I have a recording of the phone call. Below, you

I called someone two days ago, but I cannot remember what

I called someone two days ago, but I cannot remember what number I called. Luckily, I have a recording of the phone call. Below, you will find audio files of each number I dialed. Can you help me find out what number I dialed? (Hint: Import the .wav file for each digit that I dialed to MATLAB using audioread. Analyze the signal using fft. Determine the major frequency components of the signal and find out what number that I dialed for each digit. Dial tones consist of two frequencies as provided below: 697 Hz 770 Hz 852 Hz 941 Hz 1209 Hz 1 4 7 1336 Hz 2 5 8 1477 Hz 3 6 9 # * For instance, number 2 is a dual-tone signal consisting of 697 Hz and 1336 Hz components.) I called someone two days ago, but I cannot remember what number I called. Luckily, I have a recording of the phone call. Below, you will find audio files of each number I dialed. Can you help me find out what number I dialed? (Hint: Import the .wav file for each digit that I dialed to MATLAB using audioread. Analyze the signal using fft. Determine the major frequency components of the signal and find out what number that I dialed for each digit. Dial tones consist of two frequencies as provided below: 697 Hz 770 Hz 852 Hz 941 Hz 1209 Hz 1 4 7 1336 Hz 2 5 8 1477 Hz 3 6 9 # * For instance, number 2 is a dual-tone signal consisting of 697 Hz and 1336 Hz components.)

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