Upload the noisy ECG signal with the code shown below. load Yaelia-105.mat; sig data (:,1); sig1=sig; N=length (sig); tT=76.418; Ts=tT/N; FS=1/Ts; Note that the sampling period is not known and therefore it is extracted from the data. Use any of the techniques shown in this module to post at least seven of the following: a) Plot the signal in the time domain with the time axis in seconds. b) Plot the magnitude frequency response using the DFT as a function of frequency in Hz. c) Assuming a rectangular window, what is the frequency resolution in Hz afforded by your spectral analysis using the DFT? d) What is the total duration of the ECG record in seconds? e) Use the Signal Averaging technique, High Pass filtering or any other technique to produce a smooth version of the signal trace. Describe what you used and in what order. f) Plot one Epoch of the signal before and after your filtering operations and add any relevant comment. g) Comment on other student answers (meaningful comments please). h) Ask for help to the community of students.