Hi Gav,

For other hikers like me who'd never seen this one before, it's here:

http://www.teac.com/esoteric/DV-50.html

From the blurb, they're claiming something slightly different to normal upsampling. With normal upsampling, you insert zeros between the existing samples, then FIR filter the frequencies above fs/2 (aliased signals). This is an interpolating filter. They're claiming to insert new data above fs/2, which is normally considered undesirable, but they might have something very clever. According to sampling theory, there is absolutely no useful information above fs/2 - just a mirror of the useful spectrum. Normal upsampling doesn't add any new information, it just makes the analogue anti-aliasing filter's job easier by adding more margin between the useful spectrum and the mirror.

The 568's input ADC is 96kHz, 24 bit, so it would preserve freqencies below about 40-45kHz (when you take into account the anti-aliasing filter). So - yes, you would preserve some of the 'magic'. They're claiming an fs of 1.5Mhz, so it certainly wouldn't be all that is there. Theoretically they could have spectrum up to 700kHz or so!

The downside is that you've gone d-a-d in the interface.

So I'd try both and compare. It's a cop-out answer but with good reason. Analogue gives you a lot of the RDOT processing, but at the cost of two conversions.

I'd be really interested in your results if you do go for it!

Cheers,

Mark.

861v8, DSP5200, DSP5200HC, DSP5000mk2, UHD722, MF10, Prime, Prime PSU