HOWTO: Quick Frequency Response Measurements Using JAPA and Faust

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lilith
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Re: HOWTO: Quick Frequency Response Measurements Using JAPA and Faust

Postby lilith » Sun Sep 01, 2019 11:50 am

sadko4u wrote:
lilith wrote:And which slope factor to use in the LSP EQ then and what type of EQ (resonance?)?

You need to use special APO DR filters in LSP equalizer to match the REW settings.
Also, Since LSP equalizer provides APO-compatible filters, I'm currently working on this feature request sent to me as a feedback some time ago:

https://github.com/sadko4u/lsp-plugins/ ... #L196-L231


That would be great!
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Re: HOWTO: Quick Frequency Response Measurements Using JAPA and Faust

Postby CrocoDuck » Sun Sep 01, 2019 3:52 pm

lilith wrote:Is it ok to choose the Generic EQ in REW?

Yes

lilith wrote:And which slope factor to use in the LSP EQ then and what type of EQ (resonance?)?

Settings:

I set up the first equalizer in the LSP parametric EQ as in your settings as an example. See below. The slope control does not affect the APO style of filter.
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lilith
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Re: HOWTO: Quick Frequency Response Measurements Using JAPA and Faust

Postby lilith » Sun Sep 01, 2019 5:53 pm

CrocoDuck wrote:
lilith wrote:Is it ok to choose the Generic EQ in REW?

Yes

lilith wrote:And which slope factor to use in the LSP EQ then and what type of EQ (resonance?)?

Settings:

I set up the first equalizer in the LSP parametric EQ as in your settings as an example. See below. The slope control does not affect the APO style of filter.
Image
Hope it helps!


Thanks! I thought it's not implemented yet. Wow... the difference between e.g. APO and RLC is quite huge. Is it because of different Q definitions?
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Re: HOWTO: Quick Frequency Response Measurements Using JAPA and Faust

Postby sadko4u » Sun Sep 01, 2019 8:10 pm

lilith wrote:Thanks! I thought it's not implemented yet. Wow... the difference between e.g. APO and RLC is quite huge. Is it because of different Q definitions?

This is also because of a bit different filter design:
APO - Digital biquad filters derived from canonic analog biquad prototypes digitalized through Bilinear transform. These are textbook filters which are implemented as in the EqualizerAPO software.

https://lsp-plug.in/?page=manuals&secti ... r_x16_mono
LSP (Linux Studio Plugins) Developer and Maintainer.


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