Re: [linux-audio-dev] Diode wave shaper (LADSPA plugin)?

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Subject: Re: [linux-audio-dev] Diode wave shaper (LADSPA plugin)?
From: Stefan Nitschke (stefan_nitschke_AT_hotmail.com)
Date: Mon Aug 16 2004 - 12:46:14 EEST

>From: Jens M Andreasen <jens.andreasen_AT_chello.se>
>Reply-To: "The Linux Audio Developers' Mailing
>List"<linux-audio-dev_AT_music.columbia.edu>
>To: "The Linux Audio Developers' Mailing
>List"<linux-audio-dev_AT_music.columbia.edu>
>Subject: Re: [linux-audio-dev] Diode wave shaper (LADSPA plugin)?
>Date: Mon, 16 Aug 2004 11:26:24 +0200
>
>On mån, 2004-08-16 at 10:54, Stanley Jaddoe wrote:
> > Hi,
> >
> > I'm trying to convert an existing analog (hardware) synth to an open
>source
> > softsynth.
> > One of the components of the analog synth is a diode wave shaper. The
> > schematic is included (diode.jpg). The Inputs 2, 3, ... n and its
>resistors
> > are optional.
> >
> > I'd like to know if there's a LADSPA plugin (or even better: a DSP IIR
> > recurrence relation) which emulates the included schematic as close as
> > possible. Unfortunately, I don't have the EE background required to do
>this
> > myself.
>
>It's a function that converts from linear to S-shaped. It bounds
>-infinity <--> +infinity to be within -1.0 <--> +1.0 with fairly linear
>characteristics around zero.
>

The characteristics of a diode should be described by: y = ln(a*x).

- Stefan

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