New answers tagged complex
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The simplest solution is probably window design method FIR filter. Even though literature mostly only tells about designing lowpass filter, window design method is actually capable of creating any arbitrary frequency response FIR filter. Here is a reference Arbitray Frequency Response.
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I might consider doing a complex modulation of the frequency you want to notch down (or up) to 0 Hz. Then run your favorite deep DC blocker (plus phase adjustment if needed). Then complex remodulate the result back to the original unshifted spectrum.
DC block: For non real-time, just subtract the entire signal’s average. Or a long (weighted?) moving ...
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