How can I separate these four sensor data from one audio file?

Hi, I have an audio file that has four signals in it. These 4 signals are not of the same size. How can I separate these signals?

Answer 1

[Star Strider]

One approach:

D = load('signal.mat');
s = D.new_signal;
x = 1:numel(s);

[seu, sel] = envelope(s, 250, 'rms');                                   % Calculate Envelope
cpidx = findchangepts(seu, 'MaxNumChanges',3, 'Statistic','linear');    % Find Transitions

figure
plot(x, s)
hold on
plot([cpidx; cpidx], ones(2,numel(cpidx)).*ylim', '-g', 'LineWidth',2)
hold off
grid
axis tight

Out = mat2cell([s; x], 2, diff([0 cpidx numel(s)]));                    % Cell Array Of The Different Signals

The result is:

Out =

    1×4 cell array

      {2×6026 double}    {2×9632 double}    {2×6776 double}    {2×7326 double}

The separations are illustrated here:

[Md Shahriar Islam]

Thank you

[Star Strider]

As always, my pleasure.