APPENDIX D - Filtering

APPENDIX D - FILTERING

This Appendix describes the filtering options within T/HIS.

Curves can be filtered to remove high frequency noise. The technique is typically applied to acceleration and force traces. Options available include standard filters (Channel Frequency Classes 60, 180, 600 and 1000 as per British Standard BS AU 228: Part 1: 1989, and the USA's National Highway Traffic Safety Administration (NHTSA) FIR filter). The standard filters (except the FIR filter) are all special cases of the Butterworth filter.