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

16 Aug 2004

...
 From: Jens M Andreasen
&lt;jens.andreasen(a)chello.se&gt;
Reply-To: "The Linux Audio Developers' Mailing 
List&quot;&lt;linux-audio-dev(a)music.columbia.edu&gt;
To: "The Linux Audio Developers' Mailing 
List&quot;&lt;linux-audio-dev(a)music.columbia.edu&gt;
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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