Creating subsonic filter in "generate XO".

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Dahlberg
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Joined: 19 Oct 2019 23:46

Creating subsonic filter in "generate XO".

Post by Dahlberg » 22 Nov 2020 20:27

I'm thinking that it would be a good idea to create the subsonic filter in the "generate XO" instead of doing it in the
filter creation process after the time alignment is already done. :idea:

The two different XO's. The one with the subfilter is basically a 4-way filter resaved as a 3-way filter (XO4L+R deleted).
Image

The peak amplitude time difference between the two xo's is ~140 samples.
Image
Best regards. Bengt
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UliBru
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Re: Creating subsonic filter in "generate XO".

Post by UliBru » 23 Nov 2020 09:02

The subsonic filter is applied to the overall correction as a minphase filter to avoid a subsonic preringing.
It is used in macro4 because it does not influence the correction algorithms in this stage.
Stay well tuned
Uli

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Dahlberg
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Re: Creating subsonic filter in "generate XO".

Post by Dahlberg » 23 Nov 2020 09:18

So you say that the macro4 process will give a better result when compared to creating a linear phase subsonic filter time corrected for the "latency" introduced by the added XO position ?
Best regards. Bengt
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UliBru
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Re: Creating subsonic filter in "generate XO".

Post by UliBru » 23 Nov 2020 09:28

Yes. In the past I have used the subsonic directly in the target designer. But then macro3 and 4 algorithms are influencing the result.
So I have decided to use the subsonic in the last stage. You may think about it as using a minphase filter on a corrected system. Of course such a filter will have its group delay. But this is natural. A linearphase subsonic behaviour will introduce non-causal pre-ringing.
Stay well tuned
Uli

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Dahlberg
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Re: Creating subsonic filter in "generate XO".

Post by Dahlberg » 23 Nov 2020 09:31

OK, thank you :)
Best regards. Bengt
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