Re: [Jamin] multiband xover

[Steve H. <S.W...@ec...>]

On 8 Feb 2013, at 18:09, Patrick Shirkey wrote:

> 
> On Sat, February 9, 2013 3:31 am, Steve Harris wrote:
>> Sorry, I've not been following the conversation.
>> 
>> Is this a new x-over algorithm? If so, it should replace the old one - the
>> X-over was one of the weakest parts.
>> 
> 
> 
> We can definitely upgrade the algorithm. Do you recall what the issue is?
> 
> Or maybe it would be better to explain what the existing algorithm does…?

The existing algorithm uses the FFT data, which makes a poor x-over - I can't remember exactly why, I think there might be ringing in the freq domain or something?

You could tell by muting two of the three bands and putting whitenoise through it, and looking at the spectrum.

It pieces back together perfectly, but each band of the x-over in isolation is a bit ugly. I don't know how much of an issue it is, to be honest, but I seem to remember it was one of the weakest parts sonically.

My knowledge of filters isn't (and wasn't) good enough to design a good x-over that works at arbitrary sampling frequencies. I had a go with a multipole IIR, but it wasn't as clean sounding as the FFT.

- Steve

>> On 2013-02-07, at 23:05, Patrick Shirkey <psh...@bo...>
>> wrote:
>> 
>>> So, the question now is how do we manage the 2nd xover?
>>> 
>>> The obvious solution is to add multiple sliders and effectively
>>> replicate
>>> the first xover but with more sliders. However that might look a bit
>>> messy. Does anyone have a better idea for a control widget?
>>> 
>>> If we replicate the first xover then we can keep all the sliders
>>> viewable
>>> but disabled until required or do we show/hide them?
>>> 
>>> How does the user choose the number of bands easily. It seem more useful
>>> to have that functionality directly in the main window rather than
>>> having
>>> to open the preferences panel just to enable/disable a band.
>>> 
>>> We could have check boxes next to the sliders to enable/disable the
>>> bands.
>>> If enabled the output controls will be added to a scrollable panel?
>>> 
>>> Or maybe there is a better way?
>>> 
>>> 
>>> 
>>> --
>>> Patrick Shirkey
>>> Boost Hardware Ltd
>>> 
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>> 
>> 
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> 
> 
> --
> Patrick Shirkey
> Boost Hardware Ltd
> 
> ------------------------------------------------------------------------------
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