[sdiy] Digital audio demo on Youtube

[cs80 at therogoffs.com]

This is like the glide/glissando/portamento in the Yamaha CS-50/60/80 synths.  The glissando is basically a counter that starts at the current note value and goes up/down until it matches the new note.  For portamento/glide, different resistor values are switched in and out of the RC feeding the S&H to smooth out the steps.

I suggested a similar circuit/logic to Arturia years ago for their cs80v VST for smoothing of the “ribbon” data.  It needs to be semi-intelligent so normally the digital steps (in this case because of MIDI timing) need to be smoothed to sound correct/analog.  However, large jumps in value (need to define large) would indicate a discrete step (e.g. a trill with the ribbon) and should not be smoothed.   Similar issues with other knobs, etc that generate control signals.  Don’t want to hear zippering but also don’t want unintentional slide/lag on control.

 David


On Feb 18, 2014, at 1:30 PM, Mattias Rickardsson <mr at analogue.org> wrote:

> On 18 February 2014 21:54, Florian Anwander <fanwander at mnet-online.de> wrote:
>> 
>> I think Grant (aka MTG) speaks about DACs which create DC signals vulgo
>> control voltages. In this case usually noone wants a reconstruction filter
>> that would smooth out the stair - with exception of an intended
>> portamento...
> 
> A little RC filtering above the desired frequency range is not bad in
> reality though - there can be unwanted high-frequent signals present,
> turning up in the audio when CV control is applied.
> 
> /mr
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