How to give different colors to different regions of a signal(extracted from an audio amplitude-Fs)?

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Adi Ayoub 2021-11-23

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回答： Mathieu NOE 2021-11-23

i need to give different colors with an interval of 1 second

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Answer 1

Mathieu NOE 2021-11-23

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hello

maybe this ?

clc
clearvars
% signal 
Fs = 100;
dt= 1 /Fs;
samples = 5*Fs; % 5 seconds of signal
freq = 3;
t = (0:samples-1)*dt;
x = sin(2*pi*freq*t);
buffer_seconds = 1; % buffer length in seconds
buffer = buffer_seconds*Fs; % buffer length in samples
figure(1),hold on
for ci = 1:fix(samples/buffer)
    start_index = 1+(ci-1)*buffer;
    stop_index = min(start_index+ buffer,samples);
    tt = t(start_index:stop_index);  %
    xx = x(start_index:stop_index);  %
    plot(tt,xx)
end
hold off