How to resample a signal by a fraction
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Hello,
I have the time-domain received signal v(t) and I want to re-sample it at as v(t/(1+a)), where a is not an integer and it is in the order of ~10^-3. How can I do that in MATLAB, since the resample function requires that both P and Q be integer?
Thanks
采纳的回答
Matt Kindig
2013-5-19
编辑：Matt Kindig
2013-5-19
You could use interpolation instead. Something like this:
vnew = interp1( t, v, t/(1+a), 'linear');
You could use other interpolation approaches ('spline','cubic', etc.) as well, as appropriate.
更多回答（2 个）
David Barry
2013-5-17
1 个投票
I suggest you reciprocate your a variable and round it to the nearest integer. You then just need to make sure you get the arguments the correct way in the resample function.
y = resample(x,p,q) resamples the sequence in vector x at p/q times the original sampling rate
5 个评论
David Barry
2013-5-17
Apologies, I missed your 1+a bit. In that case you need to change both P and Q in the resample function by multiplying up until you get the accuracy you need.
Example: Suppose I want to re-sample by 1/(1+a) where a was 1e-3.
1+1e-3 = 1.0010 so I might want to scale up by factor of 1000 and use values of 1000 and 1001 for P and Q.
Saed
2013-5-19
David Barry
2013-5-20
I mean having P and Q values of 1 and 1.0010 is the same as having P and Q values of 1000 and 1001.
Kir
2020-5-25
P and Q are integers
Malcolm Lidierth
2013-5-19
0 个投票
Is this any help?
% SincResample returns the data convolved with a set of time-shifted windowed sinc functions, one for each of the samples [1..size(x,1)] in the input signal.
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