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TimeSeries.whiten: new method

Duncan Macleodrequested to merge
github/fork/duncanmmacleod/timeseries-whiten into master

This PR introduces two new methods for the TimeSeries:

  • TimeSeries.detrend: a simple wrapper around scipy.signal.detrend to return a TimeSeries
  • TimeSeries.whiten: a function to whiten a TimeSeries against its own ASD

The new methods are accompanied by unit tests and a new example for whitening a TimeSeries to see glitches at higher frequency.

The example reads in some data from NDS, and whitens it to show two glitches at high frequency, the resulting image is:

whiten

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