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Python Data Analysis by Ivan Idris

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Filtering

Filtering is a type of signal processing, which involves removing or suppressing a part of the signal. After applying FFT, we can filter high or low frequencies, or we can try to remove the white noise. White noise is a random signal with a constant power spectrum and as such doesn't contain any useful information. The scipy.signal package has a number of utilities for filtering. In this example, we will demonstrate a small sample of these routines:

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