delay signal by 'n' samples

103 views (last 30 days)
Padma
Padma on 15 Nov 2011
Commented: Walter Roberson on 5 Apr 2021
Suppose I have a wav signal and want to delay it in matlab by 'n' number of samples, could someone please tell me how I could do it?
Thanks in advance

Accepted Answer

Pablo López
Pablo López on 18 Jul 2019
You should use the next command:
shifted_data = delayseq(data,DELAY)
You must notice that data must be a column vector or it won't work and you should specify in DELAY the number of samples you want to delay your signal. Here you have more information.
Hope that helps!
  5 Comments
Sri Harsha Palepu
Sri Harsha Palepu on 5 Apr 2021
Can this be used to sine wave also
Walter Roberson
Walter Roberson on 5 Apr 2021
delayseq() from the Phased Array Toolbox can be used for real or complex vectors, or for real or complex 2D matrices in which each column is to be treated as a channel.
The thing to remember about delayseq() is that it works on arrays, not on some modeled underlying signal form. So it does not care whether the data happens to represent a sine wave -- if you ask to delay by two sample time then it is just going to fill in two 0's.
delayseq() is not suitable for the case where you are modeling a signal that is intended to have existed indefinitely in the past, and for which you want to do a phase change, with the intention being that the initial data will be "filled in" with whatever part of the signal would have existed in the past but in theory got delayed to the present.

Sign in to comment.

More Answers (3)

Walter Roberson
Walter Roberson on 15 Nov 2011
delayed_signal = [zeros(1,n) original_signal];
Unless that is, the signal is a column vector, in which case
delayed_signal = [zeros(n, size(original_signal,2)); original_signal];
  1 Comment
Padma
Padma on 15 Nov 2011
i am not getting the correct delay, when i am measuring it using xcorr in my program

Sign in to comment.


Wayne King
Wayne King on 15 Nov 2011
Why? Seems to me that the way Walter gave you works.
original_signal = randn(10,1);
n = 5;
delayed_signal = [zeros(n,1) ; original_signal];
[c,lags] = xcorr(delayed_signal,original_signal);
stem(lags,c);
[~,maxlag] = max(c);
fprintf('Signal is delayed %d samples\n',lags(maxlag));

Jannatul Ferdous
Jannatul Ferdous on 30 Jan 2019
x=[1 2 3 4];
subplot(3,1,1);
stem(x);
title('X');
y=[1 1 1 1];
subplot(3,1,2);
stem(y);
title('Y');
z=x+y;
subplot(3,1,3);
stem(z);
title('Z=X+Y');
  1 Comment
Walter Roberson
Walter Roberson on 18 Jul 2019
The relevance of this is not obvious?

Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!