A Note on the DAQ Decimation (Downsampling) Filters (Prior to RCG 3.0)
- Document #:
- LIGO-T1400719-v1
- Document type:
- T - Technical notes
Other Versions:
- Abstract:
- 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.
- Files in Document:
-
- DAQDecimationFilters.pdf (871.7 kB)
- Other Files:
- DAQDecimationFilters.docx (265.3 kB)
- Matlab script for loading foton coefficients (DAQDecimationFilters.m, 2.1 kB)
- for converting RCG filter coeff's to matlab SOS (fotonToSOS.m, 1.0 kB)
- Topics:
- Authors:
- Keywords:
- daq decimation downsampling
- Notes and Changes:
- These decimation filters are superseded by T1600059
- Related Documents:
- LIGO-T1600059: New RCG 3.0 DAQ Decimation (Downsampling) Filters