SOURCE:NHTSA Crashworthiness Research, DOT.
Function:Filters data forward and backward with a second order
Butterworth algorithm, giving zero phase shIFt and -3dB at FM6DB/1.2465.
Principal Variables:
A1,A2,B0,B1,B2 - DIFference equation coefficients
Y(I) - Data array (pre- and post-filtered)
FM6DB - Filter(-6dB)frequency(Hz)
DEL - Time increment of data(sec)
N1 - Index of first data point
N2 - Index of last data point
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