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I thought this was "Mythbustered" already??

Todd:

I thought that the difference between synchronous and asynchronous was that:

-synchronous used a single (master) clock and either the receiver or the transmitter "slaved" to the master
-asynchronous is when receiver and master have independent clock sources, and an ASRC (asynchronous sample rate converter) was used in a PLL (Phase locked loop).

So, this means that 44.1khz to 192khz can be synchronous OR asynchronous just as 44.1khz to 88.2khz can be. When resampling to even integer numbers, only 1/2 of you new sample set is "generated", where with non-even integer numbers the ENTIRE sample set is generated.

I'm pretty sure this is right. My Behringer DCX2496 has a CS8420 ACSR in a PLL - it resamples everything from 44.1 to 88.2 to 96khz Is it operating synchronously for 48khz but asynchronously for 44.1 and 88.2? Nope. It's asynchronous for ALL sample rates because it's an ASCR in a PLL. If it had a wordclock output and I could slave my soundcard to it, then it would be synchronous for all sample rates.

In any case, I think it is just sufficient to say "resampling to non-integer multiples" as opposed to "asynchronous versus synchronous".

Myself, I'm leaning towards NON-oversampling after what I've heard it do for PC audio, even using the famous Secret Rabbit Code upsampler. Oversampling is another ballpark and does (AKAIK) use even multiples of the sample rate.

Cheers,
Presto

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