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.