From: Jens M Andreasen <[EMAIL PROTECTED]>
Reply-To: "The Linux Audio Developers' Mailing List"<[EMAIL PROTECTED]>
To: "The Linux Audio Developers' Mailing List"<[EMAIL PROTECTED]>
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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