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

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

Answer 1

[Mathieu NOE]

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