loose-electron
Senior Fellow
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Best Design Tool = Capable Designers
Posts: 1638
San Diego California
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How can it improve something that is not there?
Any filter takes away spectral content.
If HPF, which is commonly used to get rid of a DC bias, and you set the filter break point below the fundamental, you have not removed signal content.
However, if you start to take out the fundamental, your resulting signal is going to lose it's rise-fall edges as well.
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