[music-dsp] Digital organs - Ahlborn

[Burghard Kositzke]

Hi all,

wow, the pics shows a Ahlborn-Heimerdingen with 96 oscillators as i mean.
Maybe they are octave-synchronized but i hope they are not.

Brahim and Bram:
Ok, i "get" the schematics and then i have to find a scanner. But please be
patient for a day or three.

To emulate these wonderfull warm sound (if they run not synchron)?

Hmm, i think there is a better way to do this job as emu valves. Because the
valves are not so importand to have this warm sound and the stops will never
sound realistic.Maybe the principals ca sound nice but then the flutes are
more "claripete" (a mix of clarinet & Trumpet ;-)) Maybe Bram you have luck
and you have two outputs ("sawtooth" & "sine"). Both not pure.
The "easy" thing is to use a "additive"  Soundgenerator for Principal and
Flutes or a Mix with sampled sounds and additive.
But the hook is the performance you need.
Worstcase-Example: If you calc 16 Keys pressed (coupling 2 manuals &
Feetpedal) and you have maybe 16 Stops at the same time you will generate
16*16* (8-16 or more ) Parttones = 2048 Sines. Maybe you will have the real
warm sound you will have  generate 8192 Sine as (say) 44Khz1. Then you have
2,7 nS to calc one Sample.
But this isn't all. The Envelope of  any sine has calculated too
(Frequency -and- Amplitude) and mix the whole things right.
It's a old dream of me to build such instruments in this form again. The
sound is really warm (if >= 4 channels used) and great but it is a
big-project and as i started this project in 2000 i tried to find interested
people. Maybe now ;-)???

The keyboard looks great. I think when it is ok and right justified you will
have what many people try to find or have to pay many ;-).

Burghard



----- Original Message -----
From: "Bram de Jong" <bram at smartelectronix.com>
To: <music-dsp at aulos.calarts.edu>
Sent: Tuesday, January 14, 2003 10:38 AM
Subject: Re: [music-dsp] Digital organs - Ahlborn


> Hello all,
>
>
> thank you all for the SPLENDID information!!!
> seriously!
>
> I've taken some pictures of the thing...
> The inside was very dirty, and we cleaned it up (softly)
> and discovered a dirty small schematic somewhere in there:
>
> http://www.smartelectronix.com/~bdejong/organ/
>
>
> It seems like most of the information you guys give me is dead on.
>
> James : you told me about the screws on the coils, and lo and behold,
there
> they are!
>
> Burghard : thank you for the excelent blast-from-the-past information!
> (check the pictures)
>             I would SERIOUSLY like to see those schematics!
>
> Others: thanks for the notes on tampering w/ it + the really good LC
> explanation.
>
> And, oh...
>
> > I'm offering this all because you seem to be interested in exploring the
> old beast!
>
> well wouldn't you? ;-)
> I'm not touching it now tho, I might just break it.
>
>
>  - bram
>
>
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