Windowing
Digital Signal Processing, DSP allows to threat each sample of the data differently, by weighting a function. This process is also known as tapering the sample data or information.
The tapering occurs in the time domain and its dual equivalent in frequency is frequency selecting/deselecting, better known as filtering.
The smoother the tapering, the better unwanted performance in frequency domain.
In the other hand, the sharper the tapering, the better performance of the in band within the frequency domain.
It is a trade off between the wanted and unwanted signals treatment. Tchebychev tapering is an optimum design.
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