TSC2007-Q1
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SBAS545 –SEPTEMBER 2011
Preprocessing
The TSC2007-Q1 has a combined MAV filter (median value filter and averaging filter).
MAV Filter
If the acquired signal source is noisy because of the digital switching circuit, it may necessary to evaluate the
data without noise. In this case, the median value filter operation helps remove the noise. The array of seven
converted results is sorted first. The middle three values are then averaged to produce the output value of the
MAV filter.
The MAV filter is applied to all measurements for all analog inputs including the touch screen inputs, temperature
measurements TEMP1 and TEMP2, and auxiliary input AUX. To shorten the conversion time, the MAV filter may
be bypassed through the setup command; see Table 3 and Table 4.
7 Acquired
Data
7 measurements input
into temporary array
Sort by
descending order
Averaging output
from window of 3
3
7
7
Figure 28. MAV Filter Operation (Patent Pending)
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