Low-Pass Filtering

Low-pass filtering is a ``smoothing'' operation. It reduces noise, blurs edges, and introduces delay in the time domain. Low-pass operations include averaging, summation, integration, and convolution with a Gaussian. Averaging n samples reduces noise by &radic n . An easy low-pass filter in one dimension: Outi = &alpha · Ini + (1 - &alpha) · Outi - 1 where &alpha < < 1

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