[sdiy] Using an ATMEL AVR for sound synthesis

[Jaroslaw Ziembicki]

----- Original Message ----- 
From: Gergo.Palatinszky at nokia.com 
To: aon.912230836 at aon.at 
Sent: Thursday, February 10, 2005 12:25 PM
Subject: RE: [sdiy] Using an ATMEL AVR for sound synthesis

Hello!
Pala - szia, hogy vagy? (I hope I'm using the right language!)

> In the first moment a Waldorf Pulse come into my mind. 
> So if we can manage to put some good analogue stuffs (moog ladder VCF, etc.) after the
> DCO/LFO/ADSR core it could be even better for musicians, with warmer sounds etc....

Three years ago I intended to build a "hybrid synthesizer" where each voice would
consist of a triple DCO followed by an analog Moog ladder VCF and a VCA.
The triple DCO was an AT90S1200 (now obsolete). Its main task was to generate
three sawtooth waveforms. The AT90S1200 was digitally controlled from a
"master CPU" through an 8 bit bus.
Are you - or someone else - interested in schematics and/or code of it?
The AT90S1200 code could be translated for a mega8.
I built one voice board (DCO+VCF+VCA). And then I lost any interest to finish
that project because I bought a Jupiter 8...
Anyway, I think it's a perfect combination: digital oscillators and a warm-sounding
analog filter in one voice path.

> Is there any possibility to get some signal from AVR which can be turned to
> a Control Voltage? (to drive the analogue part after the core) 

In general, it is possible either using PWM outputs or an external DAC.
In the voice circuit that I described above, the AT90S1200 generated 7 analog
voltages (external 8 bit DAC + 4051 + sample&hold). Three of them were
sawtooth waves, the remaining four were control voltages.

Regards, Jarek
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