AW: [AH] Scope Snapshots of raw vintage analog waveforms

[Haible Juergen]

Dear Osamu Hoshuyama,

thank you very much for clarification !
This is very helpful, and I'll pass it on to AH and synth-DIY.

Kind Regards,

JH.

> -----Original Message-----
> From:	Osamu Hoshuyama [SMTP:houshu at dsp.cl.nec.co.jp]
> Sent:	Sunday, August 08, 1999 10:06 AM
> To:	Haible Juergen
> Cc:	houshu at dsp.cl.nec.co.jp
> Subject:	Re: AW: [AH] Scope Snapshots of raw vintage analog waveforms
> 
> 
> Hello Juergen,
> 
> > Date:    Thu, 05 Aug 1999 13:51:22 +0200
> > From:    Haible Juergen <Juergen.Haible at nbgm.siemens.de>
> 
> > Many of the other waveforms are clearly filtered versions.
> > I doubt the author claims that these are "raw" (unfiltered)
> > waveforms (but then again I don't understand Japanese).
> > What it looks like, are waveforms after a VCF, and after AC
> > coupling between VCO / VCF / VCA stages. 
> 
> At the top of the page, the author does not claim that the waveforms
> are the real/original ones.
> 
> What he says is:
> 
> * I'd like to introduce photos of basic waveforms such as saw and
>   square in analog synths.
> * For this page, pictures on my scope were captured when the waveforms
>   from "Roland Wave Expansion Board" are displayed.
>   (The waveforms are not the real/original ones.)
> * The board contains a lot of waveforms before filter(s) of the
>   synths of the corresponding manufacturer.
>   (The author does not say that all of them are unfiltered.  I guess
>    this sentense is from the Roland manual.)
> 
> I think the waveforms are modified by Roland to simulate typical sounds
> of the original synths with digital synths.  The waveforms should include
> typical distortions with the VCFs and VCAs of the original synths.
> Those distortions are very difficult for a single digital filter to
> simulate.
> 
> Hope this helps.
> 
> Of course you can send this email to the lists. (I'm not a member of AH.)
> - -- ---- ----------- --- --- - ----- -- --- --- - - ------ - - - --
>  Osamu HOSHUYAMA          Digital Signal Processing Technology Group
>                     C&C Media Research Laboratories, NEC Corporation
>                Email: houshu at ccm.CL.nec.co.jp,  Fax: +81-44-856-2232
> --------------------------------------------------------------------