Resample function in MATLAB with resampling factors p, q

Dear all,

in order to evualuate measurement data, I would like to upsample them from 55Hz to 1210Hz with the resample function of MATLAB.

I think, that I got good results using y= resample(x,tx,fs), where

x =measurment data (input signal, [3781x1 double])

tx=Actual time steps [3781x1 double]

fs =1210Hz.

y = upsampled measurment data, [83161x1 double]

But there is also the possiblity in MATLAB to use y= resample(x,tx,fs,p,q) using p,q as the resampling factors. I don't understand what the function exactly does then. Additionally, one could add the interpolation function aswell. Is it correct, that for y= resample(x,tx,fs,p,q) the interpolation is linear?

Is there someone who could explain this function to me? I'd really appreciate. =)

Best regards

Stefan