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Hi,
I'm currently getting ready to put together a Buffalo II DAC with a host of digital inputs. I understand that onboard re-clocking is present on the Buffalo DAC module. I was wondering if any upsampling (either fixed or configurable) is involved in the re-clocking. If not, would putting a Metronome before the DAC module(s) be a viable option for implementing upsampling?
Thanks in advance.
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The ESS 9018 DAC already incorporates very sophisticated upsampling. I would not recommend adding an additional upsampler, as this would likely offer no performance improvement, and very possibly hurt the performance. Upsampling is accompanied by a digital filter, and adding additional filter stages is usually going to be counter-productive, as every digital filter comes with negative factors.
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Re-sampling into the Buffalo is only advantageous if the incoming PCM is an incompatible format. For example 48fs I2S. :) Otherwise there is really nothing to be gained.
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o so using toslink from pc soundcard ,is like double sampling . , oh well ... i could go for the usb receiver/Dac implementation so i can continue to use my hard drive as a server to my music or wait till the newer one is out of beta mode . Edited by user Thursday, January 13, 2011 4:08:35 PM(UTC)
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Quote:o so using toslink from pc soundcard ,is like double sampling No, that's not like double sampling. I would use the Toslink over USB.
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Thanks for the replies everyone. It appears as though the ESS 9018 upsamples to 864kHz (am I reading that right???). It's quite a feature-packed chip and I can now appreciate why its unit price is so high. So, to support multiple S/PDIF inputs, I would use the S/PDIF 4:1 MUX/Receiver Module and feed the outgoing I2S signal (or S/PDIF signal if that's better) into both Buffalo modules (I'm going the dual mono route)?
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I usually prefer feeding the Buffalo 2 data at the native sample rate. In an application where the signal is being crossed over and two new output streams are being created up-sampling before the manipulation is beneficial. For what it is worth adding noise shaped dither to an up-sampled audio stream is very audibly different than playing the original audio. It is the noise shaped dither that is responsible for the majority of audible differences when up-sampling. I find that 2X up-sampling can be desirable in my set up but 4X is not. Likely the HiFace clock isn't fast enough at the highest sample rates to ideally mate with the Buffalo 2. It plays but doesn't sound as good.
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Yeah, I've decided to forgo any upsampling prior to feeding the Buffalo 2. It seems that the DAC module does everything right on its own and there's no need to tinker with the input stream.
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