The GDS calibration filters were updated for ER9 on July 7, 2016. These filters are designed to correct the output of the front-end CALCS calibration model.
These filters were generated using the script run_td_filters.m located in the calibration SVN under aligocalibration/trunk/Runs/PreER9/H1/Scripts/TDfilters with SVN version #3176. Information on the exact parameters files used to generate these filters and the version of DARMModel used for these filters can be found in the run file run_td_filters.m.
In addition to the residual and control chain correction filters, the updated filters also include dewhitening filters that are unity since the pipeline is now run by ingesting double precision channels that are no longer whitened. The next generation of the GDS calibration code will not require dewhitening filters to be present in the filters file.
The new filters file can be found in calibration SVN under aligocalibration/trunk/Runs/ER9/GDSFilters/H1GDS_1151960706.npz.
Attached are plots of the residual and control correction filters. These plots compare the frequency response of the GDS FIR filters to the true frequency domain model they are based on.
A few notes I forgot to mention above:
- The updated filters file has a more aggressive high-pass filter with a cut-off of 9 Hz. The hope is that this will fix the spectral leakage issues seen by several downstream tools during ER9.
- The udpated filters file also contains accurate values for the EP1-9 values used in the kappa calculations. This means this file can be used to recalculate kappas offline during ER9 where desired.