. MATLAB problem on PSD (a) Download the files fes stim.mat and fes vaking.mat. These files contain EMG data recorded from a rat's ankle muscle while electrical stimulation was being delivered. The data was sampled at a rate of 1800Hz (b) Load the data contained in fes.stim.mat. The rat was under anesthesia in this case. c Without viewing the data in time, plot the power spectral density Sx(f) of this recorded data vs. frequency in Hz. Use 3 different methods to compute Sx() i. periodogram ii. Welch's modified periodogram, using a Hamming window, and window length of ii Welch's modified periodogram, using a rectangular window, and a window length of d) What is the peak frequency in Hz according to the 3 different estimates? Which estimate 10 L=210 do you trust most? e) View the signal in time. What does this peak frequency correspond to? (f) Load the data contained in fes vaking.mat. The rat was waking from anesthesia in this case (8) Plot the power spectral density Sx() of this recorded data vs. frequency in Hz. Use 3 different methods to compute Sx(f) i. periodogram i. Welch's modified periodogram, using a Hamming window, and window length of L = 212 ii. Welch's modified periodogram, using a rectangular window, and a window length of L-212 (h) What is the peak frequency in Hz according to the 3 different estimates? (i) Repeat steps 4g and 4h using a window length of L-2 G) Repeat steps 4g and 4h using a window length of L-210 (k) How do the different methods and window lengths affect the PSD estimates? . MATLAB problem on PSD (a) Download the files fes stim.mat and fes vaking.mat. These files contain EMG data recorded from a rat's ankle muscle while electrical stimulation was being delivered. The data was sampled at a rate of 1800Hz (b) Load the data contained in fes.stim.mat. The rat was under anesthesia in this case. c Without viewing the data in time, plot the power spectral density Sx(f) of this recorded data vs. frequency in Hz. Use 3 different methods to compute Sx() i. periodogram ii. Welch's modified periodogram, using a Hamming window, and window length of ii Welch's modified periodogram, using a rectangular window, and a window length of d) What is the peak frequency in Hz according to the 3 different estimates? Which estimate 10 L=210 do you trust most? e) View the signal in time. What does this peak frequency correspond to? (f) Load the data contained in fes vaking.mat. The rat was waking from anesthesia in this case (8) Plot the power spectral density Sx() of this recorded data vs. frequency in Hz. Use 3 different methods to compute Sx(f) i. periodogram i. Welch's modified periodogram, using a Hamming window, and window length of L = 212 ii. Welch's modified periodogram, using a rectangular window, and a window length of L-212 (h) What is the peak frequency in Hz according to the 3 different estimates? (i) Repeat steps 4g and 4h using a window length of L-2 G) Repeat steps 4g and 4h using a window length of L-210 (k) How do the different methods and window lengths affect the PSD estimates
