hello david,

a sc-filter is a switched capacitor filter.
besides the forthcoming sc-filter from doepfer there
is a switched-capacitor filter available from
blacet research, named the "final filtre".
the sc-filter has a very clean sound.
blacets design has a 30db slope and i guess that
dieters sc-filter will have an even steeper slope.
well, we'll see when the prototype is ready.

best wishes

ingo




--- In Doepfer_a100@yahoogroups.com , David Salter <david.salter@r...>
wrote:

>
> Fantastic.
>
> I'm really looking forward to the sound files for the BBD module,

very

> interesting.
>
> I may have missed something but any ideas on what the " SC-filter "

is

>
> Rgds
>
> David
>
> David Salter
> Senior Project Manager
> Reuters Ltd
> Tel +44 20 7542 2402
> Mob +44 7990562402
> email david.salter@r...
> RM david.salter.reuters@r...
>
>
>
> ________________________________
>
> From: Doepfer_a100@yahoogroups.com

[mailto: Doepfer_a100@yahoogroups.com ]

> On Behalf Of Bakis Sirros
> Sent: 13 October 2005 11:14
> To: Doepfer_a100 group
> Subject: 1 latest doepfer news!
>
>
> dieter says:
> "we are very busy as we want to show some new modules
> at the NAMM in January. During the last few days the
> prototype of the BBD module was assembled, tested and
> corrected/improved and I'm confidential that it will
> be ready for NAMM. After the first tests with the new
> BBD circuits I have changed my mind (in my last
> messages I was not sure if we will manufacture a BBD
> module - now I am !). After playing with the prototype
> (which looks very confused in the meantime because of
> the many additional soldered parts and wires) I
> really love the imperfections and drawbacks of the
> BBDs. I can say that it can be a very extreme sounding
> module and it will be up to the musician to use it in
> a standard application (normal flanger/chorus/short
> delay) or beyond the usual conditions. E.g. the BBD
> circuits are normally allowed/specified for a minimum
> clock rate of 10kHz. Yesterday we modified the (of
> course voltage controlled) clock oscillator so that it
> can go down to a few hundred Hz. Completely strange
> sounds appear at low clock frequencies as the BBDs are
> operated out of their specifications. It sounds very
> lofi, a bit like a bit cruncher or a the A-112 at low
> clock settings. The reason for the strange sound is
> not only the low clock frequency but even the BBD
> behaviour as the 2048 capacitors of the circuit have
> "problems" to keep their charges as the clock
> frequency becomes smaller. In principle a BBD is made
> of a lot of capacitors (2048 for our module) and the
> charges are forwarded from one capacitor to the next
> one at each new clock. So it's nothing but an analog
> shift register but limited to a minimum clock rate of
> ~ 10kHz. At lower frequencies signal losses appear (in
> addition to the always existing poor signal of a BBD
> device). I will do some MP3's and publish them
> a.s.a.p.
>
> For the rest of this week the SC-filter prototype has
> to be assembled and tested and next week the core of
> the universal AD/DA module is planned (smd board with
> processor and delay memory) . I will give you details
> as soon as I know more.
>
> Since 2 weeks we even have much more web space
> available so that we will put more sound examples to
> our web site. But there are so many jobs to do and we
> have to decide what to do first.
>
> Best wishes
> Dieter"
>
>
>
>
>
>
>
> GREAT or what
> Bakis
>
>
>
>
>
>
> Bakis Sirros
> Parallel Worlds
> Athens-Greece
> 1 group owner
> http://www.shimarecords.co.uk
> http://www.rubber.gr
>
>
>
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