Extract Data
Select a subset of data to use in Extract Data tab. You can extract data graphically or by
specifying start time and end time. To extract data graphically, click and drag the vertical
bars to select a region of the data to use.
Filter Data
You can filter your data using a low-pass, high-pass, or band-pass filter. A low-pass filter
blocks high frequency signals, a high-pass filter blocks low frequency signals, and a band-
pass filter combines the properties of both low- and high-pass filters.
On the Low-Pass Filter, High-Pass Filter, or Band-Pass Filter tab, you can choose to
filter all signals or specify a particular signal. For the low-pass and high-pass filtering, you
can specify the normalized cutoff frequency of the signal. Where, a normalized frequency
of 1 corresponds to half the sampling rate. For the band-pass filter, you can specify the
normalized start and end frequencies. Specify the frequencies by either entering the
value in the associated field on the tab. Alternatively, you can specify filter frequencies
graphically, by dragging the vertical bars in the frequency-domain plot of your data.
Click Options to specify the filter order, and select zero-phase shift filter.
After making choices, update the existing data with the preprocessed data by clicking
.Resample Data
In the Resample Data tab, specify the sampling period using the Resample with
sample period: field. You can resample your data using one of the following interpolation
methods:
- Zero-order hold — Fill the missing data sample with the data value immediately
preceding it. - Linear interpolation — Fill the missing data using a line that connects the two
data points.
By default, the resampling method is set to zero-order hold. You can select the
linear interpolation method from the Resample Using drop-down list.
The modified data is shown in preview in the plot.
Preprocess Data