This is the video associated with QR code QR4.5 in Chapter 4 of Time Series for Data Science: Analysis and Forecasting by Woodward, Sadler, and Robertson. https://timeseriesfordatascience.com/ This book contains over 80 videos, of which this is one. In this video Dr. Robertson discusses the Butterworth low-pass and high-pass filters and amplifies the discussion in the book regarding Example 4.5. (Despite the thumbnail, the Butterworth filter was not developed by Mrs. Butterworth. Instead it was due to the British engineer and physicist Stephen Butterworth.
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