chirp plot(i dont know what`s wrong plz help me)

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지성 이
지성 이 2020-6-14
回答： Thiago Henrique Gomes Lobato 2020-6-14
clear all;
close all;
% Aliasing.
ta = 0:1/4000:2/1000;
xa1 = cos(pi * 20000 * ta^2 + 2*pi*1000*ta);
tn = 0:1/8000:2/1000;
xn1 = cos(pi * 20000 * ta^2 + 2*pi*1000*ta);
figure
plot(ta, xa1)
hold on
stem(tn, xn1)
ylabel('x1(t), x1[n]')
title('f1 = 1000 Hz, fs = 8000 Hz')

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回答（1 个）

Thiago Henrique Gomes Lobato
Your code had some errors in respect to element-wise operator (^ instead of .^). Also you use the old time variable for the second signal. This is a version of your code that works:
clear all;
close all;
% Aliasing.
ta = 0:1/4000:2/1000;
xa1 = cos(pi * 20000 * ta.^2 + 2*pi*1000*ta); % note the .^
tn = 0:1/8000:2/1000;
xn1 = cos(pi * 20000 * tn.^2 + 2*pi*1000*tn); % tn instead of ta
figure
plot(ta, xa1)
hold on
stem(tn, xn1)
ylabel('x1(t), x1[n]')
title('f1 = 1000 Hz, fs = 8000 Hz')

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