Filtering out dither noise from 63Hz sine wave
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