BBD

[Theo]

Intresting sure!!!
This sits in my wild ideas book for years now, but there is still so much
else to do...

Things get even better if two delaylines are used, one to and one fro.
Delay 1 fed with a driver signal and the output from delay2 (feedback).
The output of delay1 split and fed to two filters, one filter to audio out,
the other to the input of delay2.
The filters are there to "shape" the resonantor, e.g. a high pass filter in
the feedback to delay2 sounds like a flare
Controlling the cutoff will damp/mute or exite the sound.

There are some practical points however.
Since the dalay lines are a fixed number of samples the long, the way to
change pitch is variating sample rate.
You will need suficcent rang here.
Also it would be nice to be able to move the "pickup" around and the same
for the driver.
This may not be that easy to realise.

Last but not least, the thing would be a hell of a motherteresia to use.
Especially when you link more together, eg. one as the "string", another as
the boddy, and some others as sympathic strings.


Cheers Theo.



----- Original Message -----
From: Augusto Pinoche <augustopinoche at hotmail.com>
To: <synth-diy at node12b53.a2000.nl>
Sent: Wednesday, May 24, 2000 9:57 PM
Subject: BBD


> How about doing a physical modelling oscillator
> model out of a BBD like SAD512 ,TDA1022,MN3004 etc.
>
> You could do that by using it as a standard
> delay, or why not do a combfilter of it!!
>
> A LPF at the end of it, a feedback path,
> and you have basic Karplus/strong module!
>
> Wouldent that be interesting?
>
> AP
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