Re: multiband xover

On Sat, February 9, 2013 8:00 am, Steve Harris wrote:
> 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=85?
>
> 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?
>

Do you think that might have been fixed with the switch to the
Kaiser-Bessel window?


> 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 <[email protected]>
>>> 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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>>>
>>>
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>>
>>
>> --
>> Patrick Shirkey
>> Boost Hardware Ltd
>>
>> ------------------------------------------------------------------------=
------
>> Free Next-Gen Firewall Hardware Offer
>> Buy your Sophos next-gen firewall before the end March 2013
>> and get the hardware for free! Learn more.
>> http://p.sf.net/sfu/sophos-d2d-feb
>> _______________________________________________
>> Jamin-devel mailing list
>> [email protected]
>> https://lists.sourceforge.net/lists/listinfo/jamin-devel
>
>
> -------------------------------------------------------------------------=
-----
> Free Next-Gen Firewall Hardware Offer
> Buy your Sophos next-gen firewall before the end March 2013
> and get the hardware for free! Learn more.
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--
Patrick Shirkey
Boost Hardware Ltd

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