delay signal by 'n' samples

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Padma
Padma 2011-11-15
评论： Walter Roberson 2021-4-5
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

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Pablo López
Pablo López 2019-7-18
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!
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Sri Harsha Palepu
Sri Harsha Palepu 2021-4-5
Can this be used to sine wave also
Walter Roberson
Walter Roberson 2021-4-5
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.

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更多回答（3 个）

Walter Roberson
Walter Roberson 2011-11-15
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 个评论
Padma
Padma 2011-11-15
i am not getting the correct delay, when i am measuring it using xcorr in my program

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Wayne King
Wayne King 2011-11-15
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 2019-1-30
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');

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