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This article has attempted to answer the question "What is a Savitky-Golay filter?" in terms that will be familiar to the DSP community and readers of IEEE Signal Processing Magazine. This article reviewed the definition and properties of S-G filters and showed how they can be designed easily using polynomial approximation of an impulse sequence. In contrast to most discussions of S-G filters, they focused on the frequency domain properties, and offered an approximate formula for the 3-dB cutoff frequency as a function of polynomial order N and impulse response half length M. Engineers with a frequency domain mindset may find this useful if they choose to use S-G filters in their application.