hello anton,

:-)

this is also better done with a digital delay module.

best wishes

ingo



--- In Doepfer_a100@yahoogroups.com , "Anton Coops" <dubshot@x...>
wrote:

>
> I will stop complaining :-))
>
> Just one question: the BBD-module has an external clock, and I
> wonder if the frequency of this clock can be quantized with the a-
> 156, or maybe with the a-148 for multitap-like use
>
> Greetings
>
> Anton
>
> On 13 Oct 2005, at 13:39, Dieter Doepfer wrote:
>
> > > 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@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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