on heart rate monitoring using an accelerometer , I found myself asking the question posed by the above title. While searching for the answer, I discovered many things that seemed to be well known to others outside the field of digital signal processing (DSP) but not to me. After adding some results of my own, I presented what I had learned at a poster session at the 2011 DSP/SPE Workshop . As I interacted with people at the poster session, I asked if they had ever heard of Savitzky-Golay (S-G) filters. Given my own ignorance, it was comforting that only one out of about 20 had heard of them. What is remarkable about this is that Savitzky and Golay’s paper , published in 1964, was described in 2000 by editors of the journal Analytical Chemistry as number five among the top ten papers ever published in that journal . They stated, “It can be argued that the dawn of computercontrolled analytical chemistry can be traced to this article. ” For this reason, I feel that it could be useful to use the "Lecture Notes " forum to introduce (or reintroduce) my colleagues in signal processing to the S-G filters
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