I have 24 bit ADC data with dithering noise on it. My original signals into the
ADC were quite small. The dithering noise therefore makes out a large part of
the amplitude of the ADC data. I want to remove the noise to recover as much as
possible of the actual signals. I find lots of websites that say that the
dithering noise can be filtered out but no description of how this can be
done.
Unfortunately I know very little about DSP filters so I do not know which type
of filter would be best. This is the first time I have tried to implement DSP
filters on real data. I used a brick wall FFT filter in Excel but found that the
final signals had a much lower amplitude if I selected only one frequency bin or
had ringing when I selected more frequency bins . I tried using Hamming and
Chebychef filters in Matlab but got out totally distorted signals.
Of all the methods I have tried, moving average has worked best but it seems
like it should be possible to filter out more noise.
My source data is a low level 63Hz sine wave with the dithering noise added. It
would help me a lot if somebody can just tell me what type of filter I should
use. Then I can go read up how it works and hopefully figure out how to
implement it to remove the dithering noise.
Posted by: s...@yahoo.co.za
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Filtering out dither noise from 63Hz sine wave
Started by ●November 10, 2014
