Bugs item #3292594, was opened at 2011-04-25 10:37
Message generated for change (Tracker Item Submitted) made by nobody
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=564599&aid=3292594&group_id=81968

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: Opcodes
Group: csound5
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: VCO opcode buggy (very instable amplitude)

Initial Comment:
Platform: Windows XP
CSound Version: 5.13  (double samples)

The vco opcode seems to be buggy and far away from
being stable in amplitude. I've provided
two csd file examples, containg just a simple vco with
a pulse waveform (pulse width 0.5).

I've also provided two screenshots of the resulting waveforms
for two arbitrary frequencies.

The main problem is, that the amplitude is very instable and
the oscillator seems to be AM modulated.

I've used an FGEN with a reasonable size (2048 samples).
It turns out that the amplitude issue decreases as the
size of the FGEN table increases, but it never really disappears.

The vco2 opcode does not seem to have these problems.

To understand, what I mean, take example "VcoTestFLTK.csd"
and move the "fine2" frequency shift slider to the left.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=564599&aid=3292594&group_id=81968

------------------------------------------------------------------------------
Fulfilling the Lean Software Promise
Lean software platforms are now widely adopted and the benefits have been 
demonstrated beyond question. Learn why your peers are replacing JEE 
containers with lightweight application servers - and what you can gain 
from the move. http://p.sf.net/sfu/vmware-sfemails
_______________________________________________
Csound-devel mailing list
Csound-devel@lists.sourceforge.net