[sdiy] A/D --> D/A conversion and audio

[harrybissell]

You could couple the audio through a small capacitor and bias the A/D input
to mid-value with two resistors, one to the positive supply and one to ground
and try that... bet it takes five minutes to confirm / deny your theory

H^) harry

Bret Truchan wrote:

> Hello!
>
> So, I've wired up this very simple circuit and I could use a little advice.
> I am using a Atmel Mega 16 microcontroller that has A/D inputs.  I'm taking
> an audio signal directly into the A/D converter and sampling at around > 40k
> hertz.  (I think!)
>
> I'm then outputing the results of the A/D to a D/A converter (DAC7625P), and
> from that into my mixer.
>
> It's working to the point here I can hear the music, but there's a lot of
> digital degradation going on.  I've posted some questions to the Atmel AVR
> site and have gotten some good advice, but none that has cleaned up the
> audio.
>
> I'm curious.  I don't have any circuitry between my audio source and my A/D
> input.  Does that mean that I'm clipping the negative voltages out of my
> source?  That seems like it could cause some distortion. :-)  This is my
> first time trying to do A/D conversion on audio!!
>
> Thanks!!
> - Bret
>
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