234
Biomedical Signal and Image Processing
11.2 Import the data in the file “p_11_2.mat” in MATLAB and plot the signal.
In order to do so, use File/Import Data … on the main MATLAB menu
and follow the steps in loading and naming of the data. The file contains one
single muscle signal from a 61 month old patient; the first column is the
time, and the second column is the data.
a. Repeat the calculations in parts a, b, and c of Problem 11.1.
b. Compare a single period with one period of the signal in Problem 11.1 and
comment on the differences.
c. A nalyze the shift in the frequency spectrum to lower frequencies compared
to Problem 11.1.
11.3 Import the data in the file “p_11_3.txt” in MATLAB and plot the signal.
In order to do so
, use File/Import Data … on the main MATLAB menu and
follow the steps in loading and naming of the data. The file contains one single
muscle signal from an 80 month old patient; the first column is the time, and
the second column is the data.*
a. R epeat the calculations in parts a, b, and c of Problem 11.1 on the EMG
recordings.
b. Using “wavemenu” and Daubechies 1 mother wavelet, decompose the signal
into five levels. Comment on the contents of each decomposition level.
c. Repeat part b using Daubechies 2 mother wavelet.
d. Compare a single period from the EMG data file from this problem
with one period of the EMG signal in Problem 11.1 and comment on the
differences.
11.4 Import the data in the file “p_11_4.mat” in MATLAB and plot the signal.
In order to do so, use File/Import Data … on the main MATLAB menu and
follow the steps in loading and naming of the data. The file contains one
single muscle signal from a 130 month old patient; the first column is the
time, and the second column is the data.
a. Repeat the calculations in parts a, b, and c of Problem 11.1 on the EMG
recordings.
b. Using “wavemenu” and Daubechies 1 mother wavelet, decompose the signal
into five levels. Comment on the contents of each decomposition level.
c. Compare a single period with one period of the signal in Problem 11.3 and
comment on the differences.
11.5 Import the data in the file “p_11_5.txt” in MATLAB and plot the signal. In
order to do so, use File/Import Data … on the main MATLAB menu and
follow the steps in loading and naming of the data. The file contains one
single muscle signal from a 163 month old patient; the first column is the
time, and the second column is the data.
a. Repeat the calculations in parts a, b, and c of Problem 11.1.
b. Using “wavemenu” and Daubechies 1 mother wavelet, decompose the signal
into five levels. Comment on the contents of each decomposition level.
c. Repeat part b using Daubechies 2 mother wavelet.
d. Identify the onset of contraction in EMG.
* Courtesy of http://www.physionet.org/physiobank/database/gait-maturation-db/
Biomedical Signal and Image Processing
11.2 Import the data in the file “p_11_2.mat” in MATLAB and plot the signal.
In order to do so, use File/Import Data … on the main MATLAB menu
and follow the steps in loading and naming of the data. The file contains one
single muscle signal from a 61 month old patient; the first column is the
time, and the second column is the data.
a. Repeat the calculations in parts a, b, and c of Problem 11.1.
b. Compare a single period with one period of the signal in Problem 11.1 and
comment on the differences.
c. A nalyze the shift in the frequency spectrum to lower frequencies compared
to Problem 11.1.
11.3 Import the data in the file “p_11_3.txt” in MATLAB and plot the signal.
In order to do so
, use File/Import Data … on the main MATLAB menu and
follow the steps in loading and naming of the data. The file contains one single
muscle signal from an 80 month old patient; the first column is the time, and
the second column is the data.*
a. R epeat the calculations in parts a, b, and c of Problem 11.1 on the EMG
recordings.
b. Using “wavemenu” and Daubechies 1 mother wavelet, decompose the signal
into five levels. Comment on the contents of each decomposition level.
c. Repeat part b using Daubechies 2 mother wavelet.
d. Compare a single period from the EMG data file from this problem
with one period of the EMG signal in Problem 11.1 and comment on the
differences.
11.4 Import the data in the file “p_11_4.mat” in MATLAB and plot the signal.
In order to do so, use File/Import Data … on the main MATLAB menu and
follow the steps in loading and naming of the data. The file contains one
single muscle signal from a 130 month old patient; the first column is the
time, and the second column is the data.
a. Repeat the calculations in parts a, b, and c of Problem 11.1 on the EMG
recordings.
b. Using “wavemenu” and Daubechies 1 mother wavelet, decompose the signal
into five levels. Comment on the contents of each decomposition level.
c. Compare a single period with one period of the signal in Problem 11.3 and
comment on the differences.
11.5 Import the data in the file “p_11_5.txt” in MATLAB and plot the signal. In
order to do so, use File/Import Data … on the main MATLAB menu and
follow the steps in loading and naming of the data. The file contains one
single muscle signal from a 163 month old patient; the first column is the
time, and the second column is the data.
a. Repeat the calculations in parts a, b, and c of Problem 11.1.
b. Using “wavemenu” and Daubechies 1 mother wavelet, decompose the signal
into five levels. Comment on the contents of each decomposition level.
c. Repeat part b using Daubechies 2 mother wavelet.
d. Identify the onset of contraction in EMG.
* Courtesy of http://www.physionet.org/physiobank/database/gait-maturation-db/