Ladder Filters

Shifrin · 30 May 2005

I've no idea 🙁

I'd love to know myself unk, it does all seem a bit mystical to me!!!

Shif.

rl · 30 May 2005

Unfortunately Filter Design IS a peace of magic. Even when transforming analog filter designs in the digital domain.

An interesting read is http://www-ccrma.stanford.edu/~stilti/papers/moogvcf.pdf unfortunately aimed for mathematics. At lest you can catch a glimpse where the mystic values come from. Basically they are trying to "tune" the filter and adjust freq/resonance values for clean sweaps.

Another refreshing lecture is http://dafx04.na.infn.it/WebProc/Proc/P_061.pdf which was the basic of my filter adaption for synthmaker

Nu Audio Science · 30 May 2005

I can set you up with a shitload of links pointing to electronics schematics and descriptions and soon, From my hardware build a synth days 🙂

Let me know and i'll post em here 😉

Tom7777 · 30 May 2005

It would be well cool to have digital electronics parts i think like capacitors, resistors, ect maybe we should make a new project for something like that. We could make stuff as good as the real synths 🙂 There is a few modules that allow you to do schematic stuff though, im guessing if the was a load of decent convertion modules to float for stuff like Hz, Khz, Volts and all the others then a lot of them would be much more easy to make exactly how they are in the Ebooks.

skOre · 30 May 2005

Yeah, had this idea too, a module pack that has all the electronic parts of that time period including their specific behaviour.... Well, could be a monster project if you ask me 😉

Shifrin · 30 May 2005

Hmm,

The "Synthmaker Analogue Component Modelling Project". Is this possible?!

Shif.

unkargherth · 30 May 2005

Thanks to all for your answers. but, in order to clarify....

What i asking for its some____ ( some where, somedoc, some explanation ) That answers teh following questions

[li] What is EXACLY a Ladder filter ? What are it's main diferences from the rest? What makes them so special that evrybody tries to emulate it ? [/li]

Better if answer is for a "poor common man" like me

jorge · 30 May 2005

Shifrin wrote: Hmm,

The "Synthmaker Analogue Component Modelling Project". Is this possible?!

Shif.

It's possible, it would be very interesting to do, I'd really enjoy it. It would be like spice using electronic circuit analysis, finding the steady state etc. It's normally done with matrices and it gets very computing intensive as each component introduces a variable that makes the complexity grow exponentially. It's really not very suited for digital processing and real time playing. The priority to implement something like that at the moment is really low, but you never know, maybe one day when all the important stuff is working. Might be an evolving thing too, the first step would be to implement very efficient Matrix operations with compiled code.

Tom7777 · 30 May 2005

The "Synthmaker Analogue Component Modelling Project". Is this possible?!

Im guessing so the first main task would be the value convertions then most of the other stuff could be made with compare, flow and maths modules. Some things could never be made though such as solar cells and springs used in spring reverbs and im guessing with tube technology a really nice filter could replace that.

unkargherth sorry for changing topic a bit maybe we should make a new one for this 🙂

Shifrin · 30 May 2005

Tom7777 wrote: and springs used in spring reverbs

Springs are easy enough to model 😉

Tom7777 wrote: unkargherth sorry for changing topic a bit maybe we should make a new one for this 🙂

Yeah, maybe a new thread? Sorry for taking this OT Unk!!!

Shif.

rl · 31 May 2005

unkargherth wrote: 1: What is EXACLY a Ladder filter ? 2: What are it's main diferences from the rest? 3: What makes them so special that evrybody tries to emulate it ?

1: simple explanation: look at the circuit diagram here. It looks like a ladder, isn't it? 2: Special sound caused by non-linearities which are difficult to model using classic pole/zero techniques. 3: because it sounds good?

Better if answer is for a "poor common man" like me

Don't worry. I did a degree in EE years ago, but I do not claim to fully understand all that stuff...

Shifrin · 31 May 2005

rl wrote: 1: simple explanation: look at the circuit diagram here. It looks like a ladder, isn't it?

I tried to open that pdf and was told I didn't have the right to (or something like that - passworded? encrypted?).

Shif.

rl · 31 May 2005

no problem here (just tried). PM me your mailaddr and I send you the pdf, if you like.

Shifrin · 31 May 2005

rl wrote: no problem here (just tried). PM me your mailaddr and I send you the pdf, if you like.

It's cool, it wouldn't open in the older version of Acrobat Reader I had on my internet machine, but I've got it now opened now 🙂

Thanks!

Shif.

unkargherth · 31 May 2005

OK. rl. So Ladder Filter its a collection of onePole filters in series with a Gloobal feedBack, True?

Name Cames From the Patenteed Moog Name Of the circuit and from The aspect of It's diagram , true?

Finally, Ladder filters are not a class of filters . only a generic name for 1001 variations of Moog VCF, true?

Then enought for me. I didn't loose more time trying to understand this anymore

Thanks to all for your colaboration