1. Exercise 3 shows the non-zero-centered frequency results. Change the code of exercise 3 to display the zero-centered frequency results and submit the MATLAB programs. 2. The following fft result is too sparse to identify its frequency pattern. Make changes to the code below to get a higher resolution of frequency (Hint: Exercise 6).
1. Exercise 3 shows the non-zero-centered frequency results. Change the code of exercise 3 to display the zero-centered frequency results and submit the MATLAB programs. 2. The following fft result is too sparse to identify its frequency pattern. Make changes to the code below to get a higher resolution of frequency (Hint: Exercise 6).
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Please assist with coding this Matlab problem exercise. Need help with number 2 refer to image. Thank you.
![1. Exercise 3 shows the non-zero-centered frequency results. Change the code of exercise 3 to display the zero-centered
frequency results and submit the MATLAB programs.
2. The following fft result is too sparse to identify its frequency pattern. Make changes to the code below to get a higher
resolution of frequency (Hint: Exercise 6).
x = [-1, 1, -1, 2]; % original signal in time domain
X = fft(x);
magx = abs(X);
figure (1); subplot (3,1,1); stem (magx);
%% Fill in your code below
% total number of point: 32
subplot (3,1, 2); stem (magX32); axis ([1, 32,0,6])
title('Zero padding: total 32')
% total number of point: 64
subplot (3,1,3); stem (magX64); axis ([1,64,0,6])
title('Zero padding: total 64')
3
1.5
2
2.5
3
3.5
Figure (A): fft result is too sparse to identify its frequency pattern
4](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1296c196-158c-4a2c-9587-82b5996e9fed%2F666508d6-6467-4138-bb0e-87836766d10b%2F9u7wugr_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1. Exercise 3 shows the non-zero-centered frequency results. Change the code of exercise 3 to display the zero-centered
frequency results and submit the MATLAB programs.
2. The following fft result is too sparse to identify its frequency pattern. Make changes to the code below to get a higher
resolution of frequency (Hint: Exercise 6).
x = [-1, 1, -1, 2]; % original signal in time domain
X = fft(x);
magx = abs(X);
figure (1); subplot (3,1,1); stem (magx);
%% Fill in your code below
% total number of point: 32
subplot (3,1, 2); stem (magX32); axis ([1, 32,0,6])
title('Zero padding: total 32')
% total number of point: 64
subplot (3,1,3); stem (magX64); axis ([1,64,0,6])
title('Zero padding: total 64')
3
1.5
2
2.5
3
3.5
Figure (A): fft result is too sparse to identify its frequency pattern
4
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