[sdiy] Atmel AT90S4433 DCO

[Arnaud PONTHET]

Hi everyone,
Here is my contribution to the AVR DCO subject:
http://perso.wanadoo.fr/arno.km/diy/dco.jpg
http://perso.wanadoo.fr/arno.km/diy/dco.asm.txt
I'm not sure that it works as it is not finished yet.
I tried to make one with a 8051 (80C2051) before using an AVR but it was too slow: now the output refresh rate is 100kHz.
It's part of a bigger synth which transmit the wave-form (Saw/sqr for the moment) and the note (0->127).
The AVR decodes the note and converts it to Phase (32bits), the Phase is then converted to the Amplitude of the sound and transmited to an external 8bit ADC (quite easy).
It's good to see other people having the same ideas.

Arno.KM



> Message du 12/02/05 17:20
> De : "Daniel Kruszyna" 
> A : synth-diy at dropmix.xs4all.nl
> Copie à : 
> Objet : [sdiy] attiny26 quad dco
> 
> Here is my take on the AVR dco. Mine's a quad 8-bit dco
> with 0v to 5v outputs. It interfaces to a master MCU
> over an SPI bus. I'm also working on a polyphonic hybrid
> synth, which will include four of these boards. It's
> still a work in progress, but I thought I'd mention it
> with all of the talk about AVRs lately.
> 
> Here's the url:
> 
> http://krue.net/dco4/
> 
> -- Daniel
> 
> PS - be nice, it's the first board I've designed :)
> 
> 
>
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