LIGO Document T1400719-v1

A Note on the DAQ Decimation (Downsampling) Filters (Prior to RCG 3.0)

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T - Technical notes
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The DAQ system uses IIR low-pass filters for data decimation when the specified frame storage rate for a channel is smaller than the rate of the RCG model that contains that channel. The filters currently in use apparently harken back to initial LIGO, but their provenance is not clear, and any design criteria seem to have been lost to history. The purpose of this note is to document the filters being used.
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Notes and Changes:
These decimation filters are superseded by T1600059
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