BassStation Filter: What is it?

[Bjorn Julin]

Yeah, there it is,one thing that are missing
are the DCO tickers, they are created in a
wery odd MCU, from matshusita if i remember right.

No wave tables just a counter tick to a integrator
who charges in a odinary whay to create sawtoth.

I remmber the "OLD and "LIVELY" discussion on diy list
about why a DCO was a VCO, and the reverse,in my opinion
there is absolutely nothing wrong whit DCO's,in my
opinion i prefer them "if" high enough resoulution
of the charge ticks are used. Besides DCO'dont soft
sync. :-)

Thanks for the link!

Reg
BJ

>you are all in luck....
>
>http://www.asahi-net.or.jp/~WZ4K-TNK/syoyuu/bsk.html
>
>Rob wrote:
>
> > Well, I remember way back when, I looked into the unit and I didnt see 
>the
> > telltale signs of a ladder filter ie neat rows of 
>transistors/capacitors.
> > Unfortunately, I don't have one on hand to check out right now.. I am 
>sure
> > once the rack unit I bought comes in, it will prlly only take me an hour
> > with my scope to figure the thing out.
> >
> > Also, a state variable filter would definitely be easier to produce the 
>2
> > pole/4 pole configuration that they used.
> >
> > As far as the VCO, I question whether it has a VCO at all. I get the 
>feeling
> > that it has a DCO driven from lookup tables in the uP.. I dont remember 
>it
> > ever going out of tune, so this would point to to a uP DCO.
> >
> > Nothing wrong with this, but you definitely don't get the warmth of 
>analog
> > with the DCO.. Still sounds good, but just a bit too perfect.
> >
> > Thanks
> >
> > Rob
> >
> > ----- Original Message -----
> > From: <metamatic at webtv.net>
> > To: <synth-diy at node12b53.a2000.nl>
> > Sent: Saturday, November 25, 2000 8:51 PM
> > Subject: Re: BassStation Filter: What is it?
> >
> > > cyborg_0 at iquest.net wrote:
> > >
> > > >Anyone know what kind of filter is
> > > >crammed in there? From what I
> > > >remember, it was some sort of state
> > > >variable filter, but I am not all that sure.
> > >  >Perhaps someone has some schematics?
> > >
> > >  I have the keyboard version. The VCF has two modes, both lowpass. The 
>2
> > > pole mode is meant to suggest a TB-303 filter, somewhat 
>unconvincingly,
> > > IMO. The 4 pole mode, however, does a wonderful job of emulating a 
>Moog
> > > VCF. I think it sounds quite a bit like my ancient Source, and along
> > > with the bonus of factory MIDI, I don't have to worry about damaging a
> > > rare membrane switch panel.
> > >
> > >  I'd love to see schematics as well, if only to see how the different
> > > cutoff slopes are achieved.
> > >
> > > Richard Hess
> > >
> > > metamatic at webtv.net
> > >
> > >
>
>--
>mark verbos
>
>"if you want something done right, build it yourself."
>
>verbos at simple-answer.com
>www.simple-answer.com
>
>watch out for...
>on my new label SIMPLE ANSWER "only a danger to myself"  and "Culture 
>Shock"
>out now.
>also...
>coming soon "World of Illusion" Simple Answer 003 now distributed by 
>Integrale,
>UK
>I have moved to Berlin!
>
>

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