Difference between revisions of "DSD"
| Line 21: | Line 21: | ||
'''ASIO 2.2''' | '''ASIO 2.2''' | ||
| − | This uses the native DSD support built into ASIO 2.2 | + | This uses the native DSD bitstreaming support built into ASIO 2.2. Your DAC must support it. Only a few do. |
DAC's that support DSD over ASIO include: | DAC's that support DSD over ASIO include: | ||
| Line 30: | Line 30: | ||
'''DSD over PCM (DoP)''' | '''DSD over PCM (DoP)''' | ||
| − | DSD over PCM packs DSD into a PCM-like signal | + | DSD over PCM packs DSD into a PCM-like signal for bitstreaming. This works in a similar way to how AC3 is packed into a PCM-like signal for S/PDIF surround sound output. |
JRiver was part of formation of the DoP standard. | JRiver was part of formation of the DoP standard. | ||
Revision as of 09:53, 14 March 2012
Overview
DSD is the format used for Super Audio CD's. Please see the article on DSD at Wikpedia more information.
Playback
By default, DSD will be converted to PCM for playback.
The DSD to PCM conversion process converts from 1-bit DSD to 64-bit PCM at 1/8th of the sample rate. The total amount of data from this conversion grows by 8x, so the process is effectively lossless / perfect.
Once you have PCM, it will be 64bit @ 352.8 kHz for DSD, and 64bit @ 705.6 kHz for DSD 2x.
It is rare for hardware to support these high sample rates, so downsampling is required. The option 'Greater than 192kHz' in DSP Studio > Output Format is what is used. There is no way to configure DSD 1x and DSD 2x independently.
A low pass filter at 30 kHz with a 24 dB/octave slope is used to remove the (basically) pink noise present in the upper frequency with DSD.
Bitstreaming
It is possible to bitstream DSD to certain DACs. This bypasses the DSD to PCM conversion.
There are multiple DSD bitstreaming technologies.
ASIO 2.2
This uses the native DSD bitstreaming support built into ASIO 2.2. Your DAC must support it. Only a few do.
DAC's that support DSD over ASIO include: Playback Designs
ASIO 2.2 requires Media Center 17.0.4 or newer.
DSD over PCM (DoP)
DSD over PCM packs DSD into a PCM-like signal for bitstreaming. This works in a similar way to how AC3 is packed into a PCM-like signal for S/PDIF surround sound output.
JRiver was part of formation of the DoP standard.
DSD over PCM requires Media Center 17.0.106 or newer.
Enabling DSD bitstreaming
To enable DSD bitstreaming, use Options > Video > Bitstreaming > Custom... and check:
- DSD for ASIO 2.2 (requires ASIO)
- DSD over PCM for DoP (requires WASAPI - Event Style)
The option is under 'Video' because bitstreaming is traditionally a video option.
With DoP, you can pick the marker format. New hardware will use DoP 1.0 (0xFA/0x05). Older hardware may use the 0xAA marker format.
DSD Sources
http://www.ps3sacd.com/dsd_downloads.html
Ripping Super Audio CD's
Article at computeraudiophile.com on ripping SACD's on an old PS3.
