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FATIMA JINNAH WOMEN UNIVERSITY BSE-VI (A+B)----DIGITAL SIGNAL PROCESSING MATLAB PRACTICE SESSION Instructor: Sidra Minhas
INSTRUCTIONS: Perform the given exercises. Make a separate ‘.m’ file for each exercise. Make functions where specified. Save each ‘.m’ file with exercise name and keep them in a single directory. Copy this directory in your USB’s or laptops from where you will give the viva. Printed hard copy is NOT required. th
Submission/VIVA Date: 17 April, 2012 Submission Time: During class timings according to roll call.
EXERCISE 1 OBJECTIVE: Signal synthesis and plotting PART- A
1. Plot x(t)= sin(2 t), 0 t 2 2. Sample x(t) with the sampling period T S=0.2, and print the values of the sampled result X(n) 3. Plot the sampled result X(n). Use black squares as markers 4. Save the figure as PDF PART- B
1. Evaluate a sine wave (y = sin(x)) at 1,000 points (x) between 0 and 2*pi. 2. What’s the value at a. Index 55 b. Indices 100 through 110 3. Find the index of a. the minimum value, b. the maximum value, and c. values between -0.001 and 0.001
EXERCISE 2
OBJECTIVE: Implement discrete time convolution. Use of conv() and w rite user defined functions.
1. Create and display the following discrete time signals: X = [-1 0 1 2 3 4] Y = [-1 -2 3] 2. Using the inbuilt MATLAB function, create a convolved signal Z= Y*Y i.e. convolution of the above signals. 3. Display the signal Z. Be clear regarding the indexes. 4. Verify that X*Y = Y*X 5. Now convolve the signal X and Y without using the inbuilt function. i.e. Write your own function of convolution.
EXERCISE 3
OBJECTIVE: Hands on with MATLAB GUI. Use of ‘ uigetfile’ and ‘ global ’ functions
Make a GUI with two push buttons and two axes which does the following actions: 1. 2. 3. 4. 5. 6.
Explore the function ‘ uigetfile’. Read an RGB image that is located on the desktop using a push button. Display this image on a new figure. Display this image on the axes of the GUI. Using another push button, convert this RGB image to gray scale. Show this gray scale image on new axes besides the previous one.
EXERCISE 4
OBJECTIVE: Recording voice signals with microphones and displaying results.
1. Record a voice signal for 10 seconds using microphone. Set sampling frequency 50000Hz and quantization level 32 bits/ sample. 2. Display the stem plot of samples of the first 5 seconds. 3. Multiply the amplitude of these samples by 2. 4. Display the stem plot of these samples. th 5. Extract the value of 100,000 sample. To which class of integers does it belong?