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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A
title=Gergo.Palatinszky@nokia.com
href="mailto:Gergo.Palatinszky@nokia.com">Gergo.Palatinszky@nokia.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=aon.912230836@aon.at
href="mailto:aon.912230836@aon.at">aon.912230836@aon.at</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, February 10, 2005 12:25
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: [sdiy] Using an ATMEL AVR for
sound synthesis</DIV></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Hello!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT><FONT face=Arial size=2>Pala - szia, hogy
vagy? (I hope I'm using the right language!)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=241461511-10022005>> In the first moment a Waldorf Pulse come into
my mind. </SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=241461511-10022005>>
So if we can manage to put some good analogue stuffs (moog ladder VCF, etc.)
after the</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=241461511-10022005>>
DCO/LFO/ADSR </SPAN></FONT><FONT face=Arial color=#0000ff size=2><SPAN
class=241461511-10022005>core it could be even better for musicians, with
warmer sounds etc....</SPAN></FONT></DIV></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Three years ago I intended to build a "hybrid
synthesizer" where each voice would</FONT></DIV>
<DIV><FONT face=Arial size=2>consist of a triple DCO followed by
an analog Moog ladder VCF and a VCA.</FONT></DIV>
<DIV><FONT face=Arial size=2>The triple DCO was an AT90S1200 (now obsolete). Its
main task was to generate</FONT></DIV>
<DIV><FONT face=Arial size=2>three </FONT><FONT face=Arial size=2>sawtooth
</FONT><FONT face=Arial size=2>waveforms. The AT90S1200 was digitally controlled
from a</FONT></DIV>
<DIV><FONT face=Arial size=2>"master CPU" through an 8 bit
bus.</FONT></DIV>
<DIV><FONT face=Arial size=2>
<DIV><FONT face=Arial size=2>Are you - or someone else - interested in
schematics and/or code of it?</FONT></DIV>
<DIV><FONT face=Arial size=2>The AT90S1200 code could be translated
for a mega8.</FONT></DIV>I built one voice board (DCO+VCF+VCA). And
then I lost any interest to finish</FONT></DIV>
<DIV><FONT face=Arial size=2>that project because I bought a Jupiter
8...</FONT></DIV>
<DIV><FONT face=Arial size=2>Anyway, I think it's a perfect combination:
</FONT><FONT face=Arial size=2>digital oscillators </FONT><FONT face=Arial
size=2>and a </FONT><FONT face=Arial size=2>warm-sounding</FONT></DIV>
<DIV><FONT face=Arial size=2>analog </FONT><FONT face=Arial
size=2>filter in one voice path.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2><FONT face=Arial color=#0000ff size=2><SPAN
class=241461511-10022005>> Is there any possibility to get some signal from
AVR which can be turned to</SPAN></FONT></FONT></DIV>
<DIV><FONT face=Arial size=2><FONT face=Arial color=#0000ff size=2><SPAN
class=241461511-10022005>> a Control Voltage? </SPAN></FONT></FONT><FONT
face=Arial size=2><FONT face=Arial color=#0000ff size=2><SPAN
class=241461511-10022005>(to drive the analogue part after the core)
</SPAN></FONT></DIV></FONT>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>In general, it is possible either using
PWM outputs </FONT><FONT face=Arial size=2>or an </FONT><FONT face=Arial
size=2>external </FONT><FONT face=Arial size=2>DAC.<BR>In the voice circuit that
I described above, the AT90S1200 generated </FONT><FONT face=Arial size=2>7
analog</FONT></DIV>
<DIV><FONT face=Arial size=2>voltages (external 8 bit DAC + 4051 +
sample&hold). Three </FONT><FONT face=Arial size=2>of them were</FONT></DIV>
<DIV><FONT face=Arial size=2>sawtooth waves, the remaining four were control
voltages.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=241461511-10022005><FONT
face=Arial color=#000000 size=2><SPAN class=241461511-10022005>Regards,
Jarek</SPAN></FONT></SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=241461511-10022005><FONT
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