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Altera_Forum's avatar
Altera_Forum
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14 years ago

zeroing of sampled signal : how ?

in my series of "stupid beginner questions" I hit a new problem. My ADC samples a signal. however, it is not guaranteed that 0 volts is reported as 128. it might be 115 or 130. correcting ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

i usually don't care about DC so i use a simple recursive filter with a zero at DC and a pole just barely inside the unit circle

something like:

H(z)=(z-1)/(z-0.999)