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If the source is discrete... why don't you just keep values at a regular time.
if "x" is a vector of length "n" containing the data:
new_x=x[1:2:n];
contains the data at half the samplig frequency
Numerical Recipes In C is for programming aproach. I suggest Matlab (no need for a Curve Fitting Toolbox, the basic commands have the tools for plynomial fit). Other SW (Mathematica, Derive, MathCAD) can do as well as Matlab. I don't have info. on stand-alone SW.
Basic math skills are necesary for further developement in other topics as FFT (Fast Fourier Transform), DFT (Discrete Fourier Transform)... all concerning Signal Processing.
You must learn the basic... by that I mean calculus and algebra... and everything build opon them... it will take 3...
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