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1  Ultimate Audio Playback / Your questions about the PC -> DAC route / Re: DEQX users ... on: July 30, 2014, 11:16:25 pm
Hi Peter,

I don't like helicopters...
I'm pretty sure that the hardware layer does have some impact on SQ.
So we agree not to agree, I hope ,-)

Of course I've done several experiments with 16 or 24 bit coded music. Results as expected. No 32 bit available, though.

Cheers
Ulli
2  Ultimate Audio Playback / Your questions about the PC -> DAC route / Re: DEQX users ... on: July 29, 2014, 09:40:00 am
Hi Peter,
Quote from: PeterSt on July 28, 2014, 01:52:19 pm
SPDIF/EAS can just "transport" 32 bits all right.
Not all SPDIF bits may carry audio bits...
BR
Ulli


From http://en.wikipedia.org/wiki/S/PDIF :
Quote
S/PDIF is meant to be used for transmitting 20-bit audio data streams plus other related information. To transmit sources with less than 20 bits of sample accuracy, the superfluous bits will be set to zero. S/PDIF can also transport 24-bit samples by way of four extra bits; however, not all equipment supports this, and these extra bits may be ignored.

More details eg. on http://en.wikipedia.org/wiki/AES3:
Quote
At the highest level, data is issued as consecutive audio blocks; each audio block consists of 192 consecutive frames. Data contained in each frame is collated into metadata for every audio block.

A 64-time-slot frame is issued each sample time; this fact determining the clock rate. The frame is divided into two 32-time-slot subframes each containing one sample; the subframes are used for the channels: A (left) and B (right). Each subframe consists of 32 time slots each of 2 symbols comprising either 1 bit encoded with biphase mark code or synchronisation preamble. In each subframe, audio data may use up to 24 bits.

The 32 time slots of each subframe are used as following:
...
8–27, or 4–27    Audio sample
...
3  Ultimate Audio Playback / Your questions about the PC -> DAC route / Re: DEQX users ... on: July 28, 2014, 12:31:48 am
Hi Peter,

I use a DEQX since quite a while (sources so far: various sw player, media player and sat-receiver; all connected via AES/EBU through 10 MHz sync-ed MC-3+ re-clocker - quite happy with that ,-)

I just discovered these page while looking around for some information related to perceived SQ differences.

Quote from: PeterSt on March 02, 2008, 12:14:44 pm
Now please keep in mind that when you set XXHighEnd to "DAC needs" to 32 bits and you feed that DigIn to the DEQX, it will apply internal 32 bit processing.
Would you pls kindly explain this a bit more?
DEQX digitally receives SPDIF or AES/EBU, only. Both signals may carry up to 24 bit per sample, as far as I know.

Thank you in advance
Ulli

As a side remark: A/D conversion inside DEQX uses an internal oscillator with some limited spec - SQ has been improved by a friend by changing this device.
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