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Giải thích chi tiết về linh kiện  SOFTWARE TECHNIQUES FOR COMPENSATING ST7 ADC ERRORS
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SOFTWARE TECHNIQUES FOR COMPENSATING ST7 ADC ERRORS
2.4 NOISE FILTERING ALGORITHM
During ADC conversions it is possible that a small number of results are received which are to-
tally different from the majority of values. These are called outliers. These may be the result of
induced noise in the system. Outliers should be filtered so that the average result is not af-
fected by them. The flowchart shows how this algorithm works.
Figure 10. Flow chart for noise filtering
yes
?
range
sample = (+/-)expected
If first sample then use this value as reference for noise
filtering
Initialise ADC, variables, and select analog channel
Check
no
Average
yes
?
over
16 samples
Is
no
START
Take ADC converted value after
Use the value
Ignore the value
End of conversion
Reset the counter
and take fresh
readings



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