Joseph Audio 'Infinite' crossovers.

Puggie · 10th April 2006, 04:13 PM

Anyone know anything about these 'infinite order' 120dB/Oct slope crossovers?

http://www.josephaudio.com/essay.islope.html

I'm curious

JohanH · 10th April 2006, 04:19 PM

Hello Puggie,

I´ve been told that his filters are based on Cauer filter topology.

Cheers,
Johan

Nemophyle · 10th April 2006, 05:10 PM

based on some trying into lspcad i would guess it is some sort of improved cauer filter technology, because a simple cauer don't give such steep slopes. Maybe with two notches instead of one for a cauer . if it is done that way, it must in fact need very careful design !

JohnL · 10th April 2006, 09:12 PM

You can get all the specifics in the patent. US patent # 4,771,466

Infinite Slope Crossover Patent

KBK · 10th April 2006, 11:02 PM

20 years?

Up next year?

David Gatti · 11th April 2006, 02:40 AM

Anybody know what the impulse/step response of these filters is like?

phase_accurate · 11th April 2006, 07:06 AM

Quote:

Anybody know what the impulse/step response of these filters is like?

Maybe we do not want to know !

Fun aside:

From measuements that I have seen it looks less bad than expected. I.e. you definitely can't build a phase-accurate speaker with them - but they don't suffer from excessive ringing like one would expect from a steep filter.

Regards

Charles

speaker · 11th April 2006, 02:37 PM

Quote:

Originally posted by JohnL
You can get all the specifics in the patent. US patent # 4,771,466

Infinite Slope Crossover Patent

I did not know Modafferi was behind that patent. IIRC, he was the McIntosh tuner guru once upon a time & offered mods to the SS MR tuners.

el`Ol · 13th April 2006, 06:08 AM

Looks as if it could be a nice anti-aliasing filter. Does anybody know the differential equation?

JohanH · 13th April 2006, 08:20 PM

More info here:

http://ldsg.snippets.org/FILTERS/Cuadra/elliptic.php3

Cheers,
Johan

10th April 2006, 04:13 PM	#1
Puggie diyAudio Member Join Date: Oct 2004	Joseph Audio 'Infinite' crossovers. Anyone know anything about these 'infinite order' 120dB/Oct slope crossovers? http://www.josephaudio.com/essay.islope.html I'm curious

10th April 2006, 11:02 PM	#5
KBK diyAudio Member Join Date: Dec 2003 Location: The Wilds Of Canada	20 years? Up next year? __________________ "Never forget that only dead fish swim with the stream." -- Malcolm Muggeridge. "Truth cannot be brought down, rather the individual must make the effort to ascend to it." -- Jiddu Krishnamurti

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10th April 2006, 04:19 PM	#2
JohanH diyAudio Member Join Date: Dec 2003 Location: Noord Brabant	Hello Puggie, I´ve been told that his filters are based on Cauer filter topology. Cheers, Johan

10th April 2006, 05:10 PM	#3
Nemophyle diyAudio Member Join Date: Sep 2004 Location: paris	based on some trying into lspcad i would guess it is some sort of improved cauer filter technology, because a simple cauer don't give such steep slopes. Maybe with two notches instead of one for a cauer . if it is done that way, it must in fact need very careful design !

10th April 2006, 09:12 PM	#4
JohnL diyAudio Member Join Date: Apr 2004 Location: Tampa, FL	You can get all the specifics in the patent. US patent # 4,771,466 Infinite Slope Crossover Patent

11th April 2006, 02:40 AM	#6
David Gatti diyAudio Member Join Date: Mar 2004 Location: Melbourne, Australia	Anybody know what the impulse/step response of these filters is like?

13th April 2006, 06:08 AM	#9
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	Looks as if it could be a nice anti-aliasing filter. Does anybody know the differential equation?

13th April 2006, 08:20 PM	#10
JohanH diyAudio Member Join Date: Dec 2003 Location: Noord Brabant	More info here: http://ldsg.snippets.org/FILTERS/Cuadra/elliptic.php3 Cheers, Johan

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