state variable VS ladder filter

Topic: state variable VS ladder filter

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Posted at October 19, 2005, 6:46 am:

what's the difference?
what do the names mean?
what other filter types are there, someone said something about cheaper diode 12db filters that could be used on a cheaper moog synth what are these?

I know that 12db, 24db refers to the slope that the freqencies are cutoff by
and i know the different types of filter like LPF, HPF, BPF and notch (are there any others)?

the main thing i want to know is how are the filters made and how the design changes the sound, MOOG sued ARP for stealing their filter design on the original odyssey II, so ARP had to design their own four-pole LPF
the design must be important for MOOG to sue ARP, i just want to know a bit more about them.

Original of the message was taken from http://www.moogmusic.com/forum/

Replies:

Without getting too technical here, a state variable filter is an acti...

good job explaining it!.

-+The patent granted for the Moog LPF was issued on October 28, 1969.

A tattoo is an expression of who you are so I don't think that would b...

The big difference between state variable and Bob's ladder filter is t...

I have a Synthesizers.

As an overall answer.

-+Perhaps, but it would seem to me that if you market a filter as being ...

Right ! This changes the overall sound so much.

Does anyone think the Voyager isn't as distorted as a Minimoog? T...

what if all of the transistors in the ladder are matched?- not just th...

-+The Waldorf Pulse uses two CA3046 transistor arrays (5 transistors eac...

Yeah but my RAM Minimoog (#1053) with all matched transistor pairs in ...

very interesting, thanks

True, but you can't get a notch (AKA band reject) response from the Vo...

Could prob.

-+Nope.

Points well taken about the effect of transistor matching in Minis.

From the Synthesizers.

-+*Raises Hand*

The very nature of the "Moog Sound" is the distortion the filter cause...

-+Now that you mention it.

*Raises Hand* : )The Hammond Novachord.

I've heard the term 'overdrive' thrown around, but what does it mean w...

-+As far as the idea of overdrive in relation to oscillators preceeding ...

Hello, The arrangement can be implemented either way.

-+eric and Lawrence, thanks for the replies! I'll have to look around on...

-+-+What I meant by pushing the filter is, and I'm not exactly sure how it...

http://en.

i think i came across intermodulation when i did some recording on an ...

I think the the VCOs can end up modulating one another as well as modu...

i don't think it's a gimmick, if was a dsp effect that just had an on/...

No, if it adds some kind, any kind, of effect to the sound it's not a ...

The 101 is not a ladder filter, correct?Gear: MF-101, Murf, MF-251, Bo...

Not a ladder filter? Where did you hear that? It's suppossed to...

I had just heard talk [not sure where], that it was not the same as th...

I've asked Kevin Lightner, who contributes to this board and who is (a...

Thanks for that info Eric.

Eric, the non descrete things used in new Moogs were mainly transist...

Till, Do you know if the new Moog filters are the same circuit as...

The Voyager's filter schematics are not available.

I opened up my MF101 and sure enough, theres a ladder of three 3086 tr...

About nine years ago I wrote a post on AH dealing with Moog filter dif...

But you're speaking of the early Sonic Sixs with the diode array, righ...

Topic: state variable VS ladder filter

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