BMEN 3311 Fall 2022 Final Exam - matlab

docx

School

University of North Texas *

*We aren’t endorsed by this school

Course

3311

Subject

Electrical Engineering

Date

Jan 9, 2024

Type

docx

Pages

7

Uploaded by BrigadierDiscovery640

Report
BMEN 3311 Fall 2022 Final Exam – MATLAB Section Student Name: Student ID
Q1. (30 points) An EMG data ( EMG.txt ) was assigned. The sampling frequency is 1000Hz. Use MATLAB to create a subplot of the EMG signal graphed over time, and an amplitude spectrum of the EMG signal. a. What frequency has the largest power? The freq with the lower power is 450hz b. In general, muscle fatigue is concentrated at lower frequencies (<50Hz). Comment on the muscle fatigue by calculating the % of power in 0-50Hz vs. the total frequency power spectrum. (<20% no fatigue; 20-40% mid; >40% high) 2 pi f =2*pi*50 hz = 100 pi W %Final exam mathlab %part 1 EMG = load( 'EMG-1.txt' ); fs=1000; N = length(EMG); f = 1/N; % Sampling rate
T=1/fs; %sampling period t = (0:1:N-1)/fs; %folding frequency Nyquist=1000/2; y1 = abs(fft(EMG)); power = y1(1:N/2+1); Power(2:end-1)=2*Power(2:end-1); F = fs*(0:(N/2))/N; subplot(2,1,2) plot(F,Power) xlabel( 'FREQUENCY' ) xlabel( 'FREQUENCY' ) title( 'Power Spectrum' ) subplot(2,1,1) plot(t,EMG); xlabel( 'signal' ) ylabel( 'Time(s)' ) grid title( 'EMG signal graphed over time' )
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
  • Access to all documents
  • Unlimited textbook solutions
  • 24/7 expert homework help
Q3. (30 points) Given an input data sequence the sampling frequency is 8000Hz. (a) Design a 41-tap lowpass FIR filter whose cutoff frequency is 1600Hz using Fourier Transform Hamming Window method. plot the frequency response of the filter. (b) Filter the first 400 data points of x(n), and plot the first 400 samples of the input and output data. %part 2 fs2=8000; n=1:500; x2=1.2*sin(2*pi*1000*n/8000)-1.5*cos(2*pi*2800*n/8000); y2=filter(Num,1,x2); freqz(Num,1,512,8000); figure; subplot(2,1,1); plot (n,x2); xlabel( 'time' ); ylabel( 'amplitude' ); title( 'data' ) subplot(2,1,2); plot(n,y2); xlabel( 'time' ); ylabel( 'amplitude' ); title( 'filterd' );
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
  • Access to all documents
  • Unlimited textbook solutions
  • 24/7 expert homework help
Q3. (40 points) A 64-channel EEG data has been given ( EEG_data.mat ). The sampling frequency is 1,000Hz. The EEG data has been contaminated by the eye blinking noise (large spikes). Your task is to use the filtering method and clean the 1st channel of the EEG data. Plot the filter frequency responses, raw data, the filtered data. The score is given by evaluating the code structure, filter design, and the effectiveness of the outcome. fs = 1000 T = 1/fs; N =length(EEG_data-1.mat); ls = size(EEG_data-1.mat); tx =[0:length(EEG_DATA-1.mat)-1]/fs; fx = fs*(0:N/2-1)/N; x= EEGsig; sd = 0.1; normal_noise = sd*randn(1, N); noisy_EEGsig = x + normal_noise; figure(); subplot(4,1,1); grid on ; plot(tx, x); xlabel( 'Time [s]' ); ylabel( 'Amplitude' ); title( 'Original signal' ); subplot(2,1,2); grid on ; plot(tx,normal_noise); xlabel( 'Time [s]' ); ylabel( 'Amplitude' ); title( 'Noise' ); subplot(2,1,1); grid on ; plot(tx, noisy_EEGsig); xlabel( 'Time [s]' ); ylabel( 'Amplitude' ); title( 'Original signal + Noise' ); subplot(4,1,4); buttLoop = filtfilt(d, noisy_EEGsig); plot(t,noisy_EEGsig,t,buttLoop) ylabel( 'Voltage (V)' ) xlabel( 'Time (s)' ) title( 'filtered signal' ) legend( 'Unfiltered' , 'Filtered' ) grid

Related Documents

Krystl Brown - Teaching Technologies - Assignment 1A Case study – Part 2.pdf
VLSI Design_hw2.docx
VLSI Design_hw3.docx
Lab 3 copy.pdf
PHY 213 Worksheet AC circuits-1-1.docx
BMEN 3311 Lab 1 F2022 answer.docx
BMEN 3311 Fall 2022 Midterm Exam_kerlos iskandar.docx
BMEN 3311 Lab3 F2022 Answer.docx
lab4_203.pdf
(15.2) Egg Collision Safety Device Analysis and Reflection - .pdf
Lab 6 (Classless Subnetting).docx
EET221L_Week2_Activity_Stemple.docx
Related Questions
7-22 Abasehand signal with frequency components from near de to 15 kHz frequency modulates a 200-kHz carrier, and the frequency deviation is +3 kHz. The signal is applied as the input to a cascade of two frequency triplers and one frequency doubler. Determine the output (a) center fre- quency, (b) frequency deviation, and (c) deviation ratio.
Sorry, there was an error with the previous question I asked.
Determine the power saving in percent when the carrier is suppressed in an AM signal modulated to 80%
4. Signal conditioning element basically takes the output of the sensing element and converts it into a form more suitable for further processing, usually in the form of a DC voltage, DC current or variable frequency AC voltage. The output of the sensing element is usually too small to operate an indicator or a recorder. Therefore, it is suitably processed and modified in the signal conditioning element so as to obtain the output in the desired form that is amplify the signal and filtering the unwanted signal. i. Describe the aliasing phenomenon. ii. Suggest a solution to minimize the effect of aliasing.
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Introductory Circuit Analysis (13th Edition)
Electrical Engineering
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:PEARSON
Text book image
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning
Text book image
Programmable Logic Controllers
Electrical Engineering
ISBN:9780073373843
Author:Frank D. Petruzella
Publisher:McGraw-Hill Education
Text book image
Fundamentals of Electric Circuits
Electrical Engineering
ISBN:9780078028229
Author:Charles K Alexander, Matthew Sadiku
Publisher:McGraw-Hill Education
Text book image
Electric Circuits. (11th Edition)
Electrical Engineering
ISBN:9780134746968
Author:James W. Nilsson, Susan Riedel
Publisher:PEARSON
Text book image
Engineering Electromagnetics
Electrical Engineering
ISBN:9780078028151
Author:Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher:Mcgraw-hill Education,
SEE MORE TEXTBOOKS
Related Questions
Recommended textbooks for you
Text book image
Introductory Circuit Analysis (13th Edition)
Electrical Engineering
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:PEARSON
Text book image
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning
Text book image
Programmable Logic Controllers
Electrical Engineering
ISBN:9780073373843
Author:Frank D. Petruzella
Publisher:McGraw-Hill Education
Text book image
Fundamentals of Electric Circuits
Electrical Engineering
ISBN:9780078028229
Author:Charles K Alexander, Matthew Sadiku
Publisher:McGraw-Hill Education
Text book image
Electric Circuits. (11th Edition)
Electrical Engineering
ISBN:9780134746968
Author:James W. Nilsson, Susan Riedel
Publisher:PEARSON
Text book image
Engineering Electromagnetics
Electrical Engineering
ISBN:9780078028151
Author:Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher:Mcgraw-hill Education,
SEE MORE TEXTBOOKS