In task 3 you need to keep 400-800 Hz frequency band rather removing it. 

• Drive link for Audio.mp3 file: https://drive.google.com/file/d/193pshUxxRhvs6eTZCUBd-pJRPeg6feWo/view?usp=sharing
• Drive link for sound_voice.wave: https://drive.google.com/file/d/1cUuAypw0_VctuafIIfmDCVyGl1Xypvad/view?usp=sharing

Task 3: Audio Filtering using Fourier Transform Write a function in MATLAB named 'audio_filtering', to 4) Find the Fourier transform of "audio' signal using FFT and plot it. The values of frequency and magnitude axis must be correct. 5) Remove the Fourier coefficients of frequencies band 400-800 Hz. 6) Reconstruct the signal using remaining components. 7) Save the reconstructed signal in 'reconstructed_audio.wave' file. [10] [5] [10] [5] Varification: Now paly this 'reconstructed audio.wave' out side MATLAB. It should sound like the "sound_voice.wave' file.