Uploaded November 2024 | Updated September 2026, 3 weeks ago

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Half-band filters, while widely used in audio applications for its efficiency, have an important drawback you should be aware of.

As Geraint Luff (Signalsmith Audio) explains, filter edges aren’t perfectly straight. So, for frequencies near zero, you can end up getting some of the frequencies you don’t want – while at the same time cutting into what you do want. This problem actually becomes worse as the sample rate increases, as he discusses later into his talk.

For Geraint’s full insight into the problem with Hilbert filters, as well as some potential workarounds, check out the full presentation on our YouTube channel:
youtu.be/RsSkBCk2FOQ