How to resample a signal by a fraction

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Saed 2013-5-17

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评论： Kir 2020-5-25

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

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Matt Kindig 2013-5-19

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编辑：Matt Kindig 2013-5-19

在 MATLAB Online 中打开

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.

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Saed 2013-5-20

This seems to work just fine.

Thanks

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David Barry 2013-5-17

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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

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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

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Malcolm Lidierth 2013-5-19

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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.

http://www.mathworks.co.uk/matlabcentral/fileexchange/12268-sinc-resample