Doepfer

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: [Doepfer_a100] 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
> >
> >
> >
> >
> >
> >
> >
>