AVR-Chat

At 03:41 AM 1/3/2004 +0000, c45a6 wrote:


>Hello!
>
>I had some fun today and wired up my Mega 16 to a D/A converter.  
>Knowing that it would probably sound terrible, I hooked up an audio 
>signal directly to the Mega 16's A/D converter, and the output from 
>the D/A converter directly to my mixer.
>
>Although highly digitized, I could kind-of make out the songs.  Part 
>of the problem could have been that I did a 10 bit A/D conversion and 
>tossed out the lowest significant 8 bits.  Another part may have been 
>that I'm running into a 12-bit D/A converter on the output (of which
>I 
>hooked up to the most significant bits).  BUT, after some 
>contemplation, maybe I also cut off 1/2 of the audio waveform, the 
>part that goes negative, in the process.

A four bit conversion, and clipping half the waveform could compromise the soundstage brilliance, or muddle the transient clarity, that's for sure.

:)

Try hopping up the A/D to 250kHz, and using all 8 bits.
AC Couple your audio, and weakly (10k?) pull the A/D input to VCC/2, and use VCC as your analog ref.