hello dieter,

please correct me if i'm wrong, but with the clock at 200 khz
the minimum delay time should be around 5 ms.
at least this is what the old panasonic data sheets say.

regarding the delay time knob, i'd prefer that the
delay time decreases when the cv increases, especially
when an 1v/oct input is available. would be better for
karplus-strong-synthesis.

best wishes

ingo



--- In Doepfer_a100@yahoogroups.com , "Dieter Doepfer" <hardware@d...>
wrote:

>
> Florian,
>
> the shortest possible delay time is calculated from these facts:
>
> max. clock frequency of the BBD used in the module (from data

sheet): 200kHz

> BBD length: 2048
> -> shortest delay time = 10 ms
>
> Maybe we could offer the module even with a 1024 or 512 BBD

circuits to

> obtain 5ms or 2.5ms shortest delay. I will see if the BBD

manufacturer

> offers pin-compatible BBDs with 1024 or 512 stages.
>
> I also will see what happens if the BBD is clocked with a frequency

beyond

> 200kHz. Maybe the data sheet is conservative and frequencies beyond

200kHz

> are possible.
>
>
> The first two examples are simply the original signals used in the

following

> examples to know and hear which audio source was used. I think it

is useful

> the know the unprocessed audio signal too.
>
> Best wishes
> Dieter Doepfer
>
> > -----Ursprüngliche Nachricht-----
> > Von: Doepfer_a100@yahoogroups.com
> > [mailto: Doepfer_a100@yahoogroups.com ]Im Auftrag von Florian

Anwander

> > Gesendet: Montag, 17. Oktober 2005 11:16
> > An: Doepfer_a100@yahoogroups.com
> > Betreff: Re: 1 BBD module first mp3 sound clips!!!
> >
> >
> > Hi
> >
> > In general the sound makes me looking happily forward for this

module.

> >
> > But....
> >
> > www.doepfer.de/A100_BBD.htm says:
> > ---------------snip--------------
> > For both audio signals a standard flanger appication was made

(triangle

> > output of a LFO is used to control the clock CV input of the BBD

module,

> > short delay time/high clock rate, medium resonance):
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^!!!!!!!!!!!!!!!!!!!!!!!!
> > * BBD_Flange_LFO_1.mp3
> > * BBD_Flange_LFO_2.mp3
> > ---------------snip--------------
> >
> > If the delaytimes in these exmples these are the shortest possible
> > delaytimes, it would be very unsatisfying. I would need MUCH(!)

shorter

> > ones! For classic Flanging and for envelope controlled notch

filter

> > stuff, and definitely for Karplus Strong Synthesis or similar.
> >
> > The shortest delaytime corresponds to the highest possible

frequency of

> > a bbd-notchfilter or the highest possible frequency of an karplus

strong

> > oscillator.
> >
> >
> > And btw. I do not understand, what is the role of the BBD in the

first

> > two expamples
> >
> > BBD_Source_1.mp3: a short sample recorded with the A-112
> > BBD_Source_2.mp3: an 8 note sequence made with A-100 modules (A-

110

> > + A-105 + A-140 controlled by a MAQ16/3)
> >
> >
> >
> > Florian
> >
> > Bakis Sirros wrote:
> >
> > > dieter says:
> > > "the very first sound examples of the BBD module are
> > > now available. As the page of this module is very
> > > preliminary so far there is no link from the other
> > > pages of our web site.
> > > Here is the (hidden) link:
> > > www.doepfer.de/A100_BBD.htm.
> > > Even the module number is not yet fixed."
> > >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>