Un post que j'ai trouvé informatif sur le sujet:
Citation:
DSD is not over-sampled but is 1 bit 2.8224 MHz which is 64 times 44.1kHz or (64 fs). 44.1kHz is limited to a 20kHz bandwidth. The potential bandwidth limitation for DSD is 1.4112 MHz however it is not used instead the maximum frequency is slightly over 100kHz, placing the "digital artifacts" a greater distance from the music range.
1 bit PCM is very noisy so the benefit of such wide frequency response is the ability to push the noise into the higher ultrasonic regions making DSD quieter than PCM in the audible range, this is called "noise shaping". After doing many plot spectrums on my SACDs I have discovered that DSD noise begins raising at 30-35kHz and on some recordings, as low as 25kHz on others and at 40kHz or lower the noise is louder than any ultrasonic signal. A 50kHz filter is usually used on SACD players to keep this noise from adversely affecting up-line equipment, so in reality the maximum ultrasonic response to be heard above DSD noise for 64 fs is around 35kHz.
It is true a lot of editing cannot be done in the DSD domain. However there is what is called "DSD wide" which is 8 bit 2.8224 MHz and is used much the same way 32 bit float is used in PCM. A 32 bit float uses the extra 8 bits for editing and the output is a 24 bit file. This is done as editing uses up bits and thus the original recording would lose resolution if edited at 24 bits. The same idea applies to DSD wide, the extra 7 bits are used for editing and the final output is a 1 bit 2.8224 MHz music file.
Editing facilities available without leaving the DSD domain are improving all the time.
In 2004 Sonoma offered many of the editing tools in the DSD domain for the first time. As of 2009 the most recent Sonoma Multitrack Recorder Editor Features
• Sonic Superiority via ST Optical with Separate Optical Clock
• True DSD recording, editing, and level adjustments
• Real-time cross-fades (Plays 48 streams during edits)
• Overdubs with gapless punch-out monitoring
• Real time waveform generation during record
• Time code generation and synchronization
• Powerful music oriented editing and event-based editing
• SA-CD Edit Master generation
• Real time level interpolation between edits
• True SA-CD Scarlet Book Annex D&E DSD metering
Some companies not editing in DSD use Digital eXtreme Definition (DXD) which is 24 bit 352.8 kHz PCM and some companies edit DSD using high resolution analog tools.
To hear what the point of DSD is all about I recommend trying some DMP "Direct to DSD" SACDs with no editing within a song or movement. This is about as pure DSD one can get and they sound fantastic, smooth and extremely realistic.
Personally I believe
1) "real" DSD recordings should be released as SACDs or DSD downloads.
2) High resolution 24 bit PCM should be released as DVD-Audios or high resolution 24 bit PCM downloads.
I don't think it is a good idea to convert back and forth from DSD to PCM especially when we have the tools to release in a high quality format that matches the original master.