Segmentation of audio signal.

Hello everybody!

I have this issue about segmentation of audio signal. I want to do segmentation of audio signal but with overlap of each segment of 25%. For example, first segment of signal will start from 0 sec to 1 sec, next segment will start from 0.75 sec to 1.75 sec, third segment will start from 1.5 sec to 2.5 sec. etc. Later I need to use each segment seperatly for futher analysis so it is good to put every segment in some vector or again save as audio signal... I create picture where I paint segments in signal.

Thanks in front!

Answer 1

[Star Strider]

Try this:

s = 0.1*randn(1E+4,1)+sin(0.02*pi*(1:1E+4)'-1);     % Signal (Column Vector)
L = numel(s);                                       % Vector Length
Fs = 1000;                                          % Sampling Frequency
Ts = 1/Fs;                                          % Sampling Interval
sec1 = 1:Fs;                                        % One-Second Segment Length
secq = fix(3*Fs/4);                                 % 750ms Segment Length

seg = zeros(Fs,fix(L/Fs));                          % Preallocate
for k = 1:fix(L/Fs)
    seg(:,k) = s(sec1+secq*(k-1));                  % Signal Segments
end

If you only wanted the segments without the offset, the reshape function would have been best.

[Djordje Damnjanovic]

Thank You very much for help!

Here is the thing.

Signal s is size of 8000. So, L=8000. Sampling is Fs=16000;

So need segments of 50 ms, overlap of 25 ms.

How to rewrite Your code for this parameters?

Thanks Again!

[Alsha Babu]

@Star Strider

Could you please tell me how the reshape function can be used to remove the offset?

Answer 2

[Greg Dionne]

If you have the Signal Processing Toolbox, buffer may be what you're after.

Hope this helps!

-Greg

[Djordje Damnjanovic]

I will also try with buffer! Thanks!

Answer 3

[Sravanth Meka]

s = 0.1*randn(1E+4,1)+sin(0.02*pi*(1:1E+4)'-1); % Signal (Column Vector) L = numel(s); % Vector Length Fs = 1000; % Sampling Frequency Ts = 1/Fs; % Sampling Interval sec1 = 1:Fs; % One-Second Segment Length secq = fix(3*Fs/4); % 750ms Segment Length

seg = zeros(Fs,fix(L/Fs)); % Preallocate for k = 1:fix(L/Fs) seg(:,k) = s(sec1+secq*(k-1)); % Signal Segments end

if true
  % code
end