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[FR]: Increase the frequency range of bands, esp low pass and high shelf? #140

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SionnachDearg opened this issue Dec 20, 2024 · 4 comments
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backlog This will not be put into the current plan enhancement New feature or request

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@SionnachDearg
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Thanks for taking the time to make a feature request!

  • I have read the plugin manual and searched the existing issues.

Why?

Hello, thank you for this great eq. 

I use a low pass (high cut) filter at 6db/oct or 12 fairly often, to slightly tip high frequencies downwards at the air frequencies. I would love to be able to do this for this eq, but it requires me to set a low pass as high as 40 khz, usually more like 30-35.

What do you want?

That way it JUST starts to tip down in the audible bandwidth. 

I use shelves this way too sometimes, setting them above 20khz. 

Is it possible to implement something like this? I guess it might require oversampling the eq a bit? 

I mostly mix in 88.2khz to have the antialiasing filter higher, otherwise the filter cramps when I'm doing this. 

Thank you!

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@SionnachDearg SionnachDearg added the enhancement New feature or request label Dec 20, 2024
@zsliu98
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zsliu98 commented Dec 21, 2024

If you want a low pass at 30kHz under 44.1/48kHz sample rate, the plugin needs:

  • either oversampling: for example, TDR Nova, which introduces latency and increases CPU load. I want to avoid it if possible.
  • or a robust de-cramping filter algorithm: for example, Pro-Q (but even Pro-Q fails to do it accurately when the slope of the filter is high). Although this plugin also has built-in de-cramping, I am not able to make it work when the cut-off freq is above or very close Nyquist.

If you want to slightly tip down the air frequency, you could use a 24dB/oct high-shelf at 20kHz.

@zsliu98 zsliu98 closed this as not planned Won't fix, can't repro, duplicate, stale Dec 21, 2024
@SionnachDearg
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SionnachDearg commented Dec 21, 2024 via email

@zsliu98
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zsliu98 commented Dec 21, 2024

Yes, it is possible. Under 88.2kHz we can set it at 30kHz without over-sampling as 30kHz is under Nyquist.

However, the workload is too huge, as I have to rewrite a lot of UI code. I won't include it in my current plan.

@zsliu98 zsliu98 reopened this Dec 22, 2024
@zsliu98 zsliu98 added the backlog This will not be put into the current plan label Dec 22, 2024
@SionnachDearg
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SionnachDearg commented Dec 22, 2024 via email

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