Detecting Certain Parts of a Specific Signal

Question

Raj Kubaryet 2023-5-25

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1973739-detecting-certain-parts-of-a-specific-signal

回答： Star Strider 2023-5-25

Hello,

I created a random signal as follows:

clear all; clc;
% Creating signal
x = 0:0.1:pi;
y = 5*sin(x)+10;
j = [];
for i = 1:20
    j(i) = 9.9 + (10.1-9.9) .* rand(1,1);
end
v = cat(2, j, y);
y = 2*sin(x)+10;
v = cat(2, v, j);
v = cat(2, v, y);
v = cat(2, v, j);
v = cat(2, v, j);
x = pi:0.1:2*pi;
y = 4*sin(x)+10;
v = cat(2, v, y);
v = cat(2, v, j);
v = cat(2, v, j);
x = 0:0.1:pi;
y = 1.5*sin(x)+10;
v = cat(2, v, y);
v = cat(2, v, j);
v = cat(2, v, j);
% Plotting
plot(v)

I want to detect all of the convex and concave structures (not only the amplitude but also the width) in this signal as in the image below. Can you suggest a method for this?