while oversampling uses factors that are integers such as 4x or 8x. So, upsampling can be done using non-integer factors such as 1.3333 or 2.5 etc. Oversampling is a limited subset of upsampling where the factor values are limited to integer values. Upsampling involves increasing the sample rate of a digital signal from its base rate (eg 44.1KHz for Red Book CDs) by any selected factor which need not be an integer value. You have no choice but have Audirvana decode your DSD to PCM.Just a note on how upsampling and oversampling differ: I'm assuming if I used other connection it wouldn't be like that, the DSD signal is still "native" when it reaches the Devialet and then DSD MAT Procees kicks in with its magic!ĭSD over PCM via Air doesn't work on OSX, only Windows. I tried changing in Audirvana preferences the setting to "DSD over PCM standard 1.0" but then I get a lovely dose of white noise, non stop actually:-( DSD64 isn't lit up/shown as a possibility then, only the various PCM possibilities.Ĭorrect me if I'm wrong, but I think Audirvana recognizes I'm using Air Ethernet and converts to 176,4 kHz, that's what my amp is showing me as well if I push the source button on the remote. As I'm using Audirvana, I have in the "Audio Systems settings" in preferences, Native DSD capability set to Automatic Detection. (1, 19:17)Dougiet Wrote: Thanks for the fast responses :-)Īre the incoming audio files still in DSD format when they enter our beautiful amps. Using only 15 bit perfect additions (no multiplication, no storage), the MAT algorithm performs a 128 taps, linear phase FIR (Finite Impulse Response) digital filter ensuring the conversion of the DSD format into internal native PCM format with truly outstanding performances." MAT DSD Core technology converts the DSD format into Expert internal native PCM 40 bits / 384 kHz format thanks to an optimized algorithm, limiting the amount of computational operations on the audio stream. This new feature is available through the USB input but also on the digital XLR input (AES/EBU), the TOSLINK optical input and all coaxial digital inputs (S/PDIF). The entire Expert range is now compatible with the DoP protocol (DSD over PCM). Thus, on a bandwidth point of view, it is technically feasible to carry an audio DSD stream over a High Definition capable PCM digital input. The raw bitrate of an audio DSD stream is higher than that of an audio CD and equivalent to a High Definition PCM stream. The conventional PCM format of audio CDs encodes music on 16 bits (65536 levels), 44100 times per second, whereas DSD format encodes music on 1 bit (using only 2 levels: 0 or 1) but much more frequently: 2.8224 million times per second (DSD64 ou DSD 1x), 5.6448 million times per second (DSD128 ou DSD 2x) and even 11.2896 times per second (DSD256 ou DSD 4x). Considered by many industry leaders as the most analog sounding of digital formats, DSD has gained a solid reputation over time and has quickly become a reference format for the most demanding of audiophiles. In the « computer audio » era, it has now become much more accessible. "The DSD sound format (Direct Stream Digital) was released in 1999 with the introduction of the SACD (Super Audio Compact Disc).
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I know some here tested dCS Vivaldi Upsampler set to DSD 64 and thougt that was better than sending PCM to Devialet I asume this has to do with the filters used to convert to DSD and then the filters in Devialet back to PCM 40/384kHz. It is possible to send them as DoP over AIR to Devialet but all DSD is converted to PCM with Devialets MAT process so I dont know if it is something that matters really.