GDM-8352 User Manual
80
Digital Filter
Digital Filter Overview
Filter Basics
The digital filter converts the analog input signal
into digital format before passing it to the internal
circuits for processing. The filter affects the amount
of noise included in the measurement result.
Filter Type
The digital filter averages a specific number of
input signal samples to generate one reading. The
filter type defines the averaging method. The
following diagrams show the differences between
each filter type, using 4 samples per reading as an
example.
Moving Filter
The moving filter takes in one new sample and
discards the oldest sample per reading. This is the
default behavior when the digital filter is not
specified, and is recommended for most
applications.
Repeating Filter
The repeating filter renews all the samples per
reading.
1
Sample #
1st reading Sample 1 - 4
2nd reading Sample 2 - 5
3
2
4
5
6
7
8
9 10 11 12
3rd reading Sample 3 - 6
1
Sample #
1st reading
Sample 1 - 4
2nd reading
Sample 5 - 8
3
2
4
5
6
7
8
9 10 11 12
3rd reading
Sample 9 - 12
