Filter

Contains curve filtering functions, including Butterworth, FIR, and a new SAE 1995 that are not available to regular HyperGraph 2D users.

Filtering requires the time unit of seconds. You must convert your data to seconds before applying a filter.

The Filter menu contains the following plot macros:

Batch General
HyperGraph 2D filter. Low pass, ideal filter.
Batch Mirror
HyperGraph 2D filter. Mirrors data before filtering to smooth start and end points of filtered curve.
NHTSA Butterworth
Filters data forward and backward using a second order Butterworth algorithm.
NHTSA FIR100
Performs 100 Hz finite impulse response filtering of a digitized time series.
FreqDomainDiff
Differentiates the given curve (time based) in the frequency domain.
IR
Impulse response filter function.
Resample
Resamples the given input curve to the specified data frequency.
SAE General
Displays secondary menus SAE (J211, Mar1995) and SAE (hg).
SAE (J211, Mar1995)
Complies with March 1995 SAE-J211 guidelines for 60 and 180 CFC filtering.
No Padding
Does not add any additional time to the x axis. Filters the data forward, backward, forward and backward, or backward and forward.
Zero Padding
Pads data with constraints to improve filtered data appearance at start and end points. Adds additional time to the x-axis at the zero value for y. Filters the data forward, backward, forward and backward, or backward and forward.
Mirror Padding
Mirrors data before filtering to improve filtered data appearance at start and end points. Filters the data forward, backward, forward and backward, or backward and forward.
ISO6487 Padding
Mirrors data before filtering according to the ISO 6487 standard.
SAE (hg)
HyperGraph 2D generic SAE filters. Filters include SAE60, SAE180, SAE600, SAE1000, SAE General, SAE Mirror.