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
>
>
>
>
>
>
>