Time Domain Representation of Continuous and Discrete Signals
49
>> subplot(3, 1, 1);
>> plot(n, WHAM);
>> title(‘Hamming(31) window’);
>> ylabel(‘Amplitude’);xlabel(‘n’)
>> subplot(3, 1, 2);
>> plot(n, WHAN);
>> title(‘Hanning(31) window’);
>> ylabel(‘Amplitude’);xlabel(‘n’)
>> subplot(3, 1, 3);
>> plot(n, WBLAC);
>> title(‘Blackman(31) window’);
>> xlabel(‘n’);
>> ylabel(‘Amplitude’)
R.1.157 Observe that the Hamming, Hanning, and Blackman window models shown in
Figure 1.39 present similar shapes. They are plotted on the same graph for comparison purposes in Figure 1.40, given by script fi le compare_win.
MATLAB Solution
% Script file:compare _ win
% This file returns the plots of the
% HAMMING, HANNING and BLACKMAN windows
% using 31 points.
%*******************************
clc;clf;
n = -15:1:15;
Blackman (31) window
−15
−10
−5
0
5
10
n
15
1
0.5
−15
−10
−5
0
5
1 0
15
0
Hamming (31) window
Hanning (31) window
1
0.5
−15
1
−10
−5
0
5
10
15
0
Amplitude
Amplitude
Amplitude
n
n
0.5
0
FIGURE 1.39
Plots of the Hamming, Hanning, and Blackman windows of R.1.156.
CRC_47760_CH001.indd 49
CRC_47760_CH001.indd 49
7/25/2008 4:16:19 PM
7/25/2008 4:16:19 PM