What is the difference between cubic interpolation and cubic "Spline" interpolation?. How to use it for upsampling purpose?
Proving Nyquist Sampling Theorem for Strictly Band Limited Signals (Whittaker Shannon Interpolation Formula)
Can you decimate / downsample a signal in frequency domain just like you can interpolate / upsample it?
The Proper Way to Do Sinc Downsampling (DFT Downsampling) for Uniformly Sampled Discrete Signals with Finite Number of Samples
Why Zero Padding in the Center of the DFT Interpolates / Upsamples the Signal (Sinc Interpolation / DFT Interpolation / Periodic Interpolation)
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