Is there any better way to find the average of a dynamic signal for a specific time like 10s or something.?

I have a dynamic signal which needs to be taken average every X seconds. Please post down your ideas how to do it.

p.s : without using mean

Answer 1

[Mathieu NOE]

hello

this is a demo code for splitting a signal in smaller chunks (buffer) with or without overlap (as you prefer)

for each buffer you can compute whatever metrics you need (min / max / rms / sigma....)

clc
clearvars

% dummy data
data = rand(320,3); % data must be column oriented (number of rows = number of samples)
buffer = 25;    % nb of samples for averaging 

%% zero overlap averaging (unweighted)
[m,n] = size(data);

for ci=1:fix(m/buffer)
    start_index = 1+(ci-1)*buffer;
    stop_index = min(start_index+ buffer-1,m);
    time_index(ci) = round((start_index+stop_index)/2);  % time index expressed as sample unit (dt = 1 in this simulation)
    avg_data(ci,:) =mean(data(start_index:stop_index,:));  % 
end

figure(1),
plot(time_index,avg_data,'+-');

% return

%% averaging with overlap  
clearvars
% dummy data
data = rand(320,3);

buffer = 25;  % nb of samples in one buffer (buffer size) 
overlap = 10; % overlap expressed in samples

%%%% main loop %%%%
[m,n] = size(data);
shift = buffer-overlap;    % nb of samples between 2 contiguous buffers  
for ci=1:fix((m-buffer)/shift +1)
    start_index = 1+(ci-1)*shift;
    stop_index = min(start_index+ buffer-1,m);
    time_index(ci) = round((start_index+stop_index)/2);  % time index expressed as sample unit (dt = 1 in this simulation)
    avg_data(ci,:) = mean(data(start_index:stop_index,:));  % 

end

figure(2),
plot(time_index,avg_data,'+-');

Answer 2

[Peter Perkins]

Why would you not use mean?

In any case, make a timetable, and use something like

retime(tt,'regular','mean','TimeStep',seconds(10))