> Just one remark: personally I wouldn't mind an additional bbd
> module that's optimized for solid sound at delay times around 500
> ms or longer, but just as an extra, you know... ;-)

Sorry - with the 2048 stages BBD this is not possible (and daisy-chainging
several BBDs leads to additional noise). For 500 ms you would have to use a
clock of about 4kHz for the 2048 stage BBD leading to a usable band-width of
much less than 2 kHz.

For such applications the planned analog delay/universal AD/DA module will
be the right choice. Here we will have probably 4MB memory that leads to
more than 10 seconds delay time even at 40 kHz clock rate (20kHz band
width). It will also be voltage controlled but instead of a BBD 12 Bit ADC
and DAC are used. You will probably be able to select a certain memory
length: very short - e.g. only 8 ... 64 - for clocked CV-delay applications,
up to several thousands for the typical chorus/flanging effects, and some
hundred thousands up to millions for delay applications. The chosen memory
will be written/read with the desired (voltage controlled) clock: a few Hz
only for CV delay, some hundred to thousand Hz for lo-fi effects and some
ten kHz for good quality flanging, chorus, delay and similar. A voltage
controlled oscillator will be includede with probably 2 or 3 ranges for CV
delay (some Hz, LFO range), lo-fi effects (some hundred to some thousand
Hz), high quality effects (10 kHz up to ~ 100 kHz). So you are able to
combine different lengths and clock frequencies to obtain the desired
function.

Best wishes
Dieter

> On 13 Oct 2005, at 3:34, Bakis Sirros wrote:
>
> > hello david,
> > it's a Switched Capacitor filter. don't ask me though
> > anything more, i do not know. i guess that it sounds
> > quite different from the other filter modules dieter
> > best regards,
> > bakis.
> >
> >
> >
> >
> >
> > --- David Salter < david.salter@... > 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@...
> > > RM david.salter.reuters@...
> > >
> > >
> > >
> > > ________________________________
> > >
> > > 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
> > >
> > >
> > >
> > > __________________________________
> > > Yahoo! Music Unlimited
> > > Access over 1 million songs. Try it free.
> > > http://music.yahoo.com/unlimited/
> > >
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> > Parallel Worlds
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> > http://www.shimarecords.co.uk
> > http://www.rubber.gr
> >
> >
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