(a) Download the audio file from the elearning course page. Extract the file and save it in the MATLAB work directory. (b) Read the whole file into MATLAB and store it in the vector m. (c) Determine the length of the audio file in seconds. D = (d) Play the sound file using MATLAB and listen to the signal carefully at a sampling rate 8000 Hz. (e) Use MATLAB to obtain the spectrum of the audio signal, m(t), for this you can use the provided function [Xw, w] =SpecSigProj(x,t). For more information about this func- tion type help SpecSigProj. Then, according to the channel bandwidth requirement, design a fifth order Butterworth filter to pass the signal frequency components up to the required bandwidth. In this case the num and den can be calculated automatically using butter (N,wc,'S') command as shown in class. Show the frequency response of the designed system, the spectrum of the signal m(t) and me(t) at the input and output of the LTI system, H.(w). In your report show the complete design of Hi(w) and the (a) Download the audio file from the elearning course page. Extract the file and save it in the MATLAB work directory. (b) Read the whole file into MATLAB and store it in the vector m. (c) Determine the length of the audio file in seconds. D = (d) Play the sound file using MATLAB and listen to the signal carefully at a sampling rate 8000 Hz. (e) Use MATLAB to obtain the spectrum of the audio signal, m(t), for this you can use the provided function [Xw, w] =SpecSigProj(x,t). For more information about this func- tion type help SpecSigProj. Then, according to the channel bandwidth requirement, design a fifth order Butterworth filter to pass the signal frequency components up to the required bandwidth. In this case the num and den can be calculated automatically using butter (N,wc,'S') command as shown in class. Show the frequency response of the designed system, the spectrum of the signal m(t) and me(t) at the input and output of the LTI system, H.(w). In your report show the complete design of Hi(w) and the