[sdiy] Xilinx 3E board comments

[Paul Maddox]

Eric,

> That said, a 6kHz sawtooth generated at a 50MHz sample rate will have 
> worst-case aliases in the -78dB range. Those will be barely audible in a 
> mix of any complexity.

yep.

> Additionally, if you don't have at least 13 bits of linearity in your DAC 
> they'll get swamped out by quantization noise and THD. Consequently, the 
> 12-bit DAC on the 3E Starter Kit won't even resolve them.

spooky, the monowave uses 8bit DACs, and as I say, at 3.5Khz I can't hear 
*any* aliasing on the raw waveforms (out of DAC, into mixer/PA)..

I know the math says it should sound horrible, but it didn't :-)

Paul