Questions tagged [dirichlet-kernel]

The Dirichlet kernel is the convolution kernel for the Discrete Fourier Transform (DFT) to interpolate between the discrete bins or samples of the DFT or of the inverse DFT.

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Radix2 fft - zero padding output size

With zeros padding the FFT radix2 has different input size than output. How to deal with that? I see two solutions but not sure which one is better/appropriate. Maybe you know some other and better ...
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Whittaker-Shannon ($\mathrm{sinc}$) interpolation for a finite number of samples

Given an infinite number of samples $(N)$, a higher (or lower) number of samples $(cN)$ can be derived using sinc interpolation followed by sampling. How can this be applied to finite length signals? ...