Talk:Direct Stream Digital

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Has Direct Stream Digital Video ever been proposed? Photographic images of any kind, including those captured electronicly by TV/Video camaras, etc, are an analog phenomenen, similar to sound.

Yes. DSD is pulse-density modulation, a generalization of the pulse-width modulation used in Laserdisc. --Damian Yerrick (☎) 01:53, 1 February 2006 (UTC)

I just read about a format called DXD based on DSD. Sounds interesting, see link snippet below Christopher Sajdak 01:38, 29 December 2006 (UTC)

The advantages of DXD for SACD A new format, DXD (Digital eXtreme Definition for high quality and low noise recording and editing for SACD), has recently been acknowledged by Philips and Sony. DXD was initially developed for Merging’s Pyramix DSD workstation and recognised as one of the best formats for DSD source recording. Now that the first A-D and D-A convertors are available for converting direct into DXD, Digital Audio Denmark MD MIKAEL VEST gives a general overview of recording for SACD with an outline of the pros and cons of DXD.

Does anyone think that the article needs to cover more of the noise-shaping algorithms that DSD recording devices use? I am not the person to ask regarding this subject but I think it's an important difference between PCM and DSD. Ptmoore 22:50, 7 May 2007 (UTC)

[edit] quality

when i run spectral analysis on pcm wav ripped from CDs, many times the frequency rate peaks below 44.1, also consider the generations of recording on dats. have any recordings actually utilized the extremely high frequency possible with this format? i'd like to have moar information on this subject plz. --AlexOvShaolin 01:08, 4 August 2007 (UTC)

This is a fairly standard thing - studios often run 20khz low pass filters on their final mixes to avoid any ringing artefacts on CD from frequencies near/over the 22.05khz Nyquist limit of the 44.1khz media, and probably to reduce treble noise on analogue media (don't think I've come across a tape out of any I've analysed that mustered 20khz, regardless of what was prerecorded on it, or what the sales pitch on the shrinkwrap of blank cassette may have said). A number of them do go pretty much all the way up to 22khz, the only suggestion I can make for these differences is the age of the recording - newer equipment will have better quality and largely digital filters that can make a very effective, narrow 'cut', say with the filter output dropping sharply from 0db at 21.5khz to -96dB at 22.0khz, but older mixers will have much looser, cheaper, analogue filters that might need a good couple khz of bandwidth to muster a -60dB drop, and so will start rolling off from around 19khz in order to knock out enough of the high frequencies. Also any discs made from older material will suffer similar problems simply from lower fidelity master material, when it didn't matter much to preserve the very highest frequencies as vinyl couldn't easily represent them even on the first play, and rapidly lost treble fidelity on repeat plays. (I have no citations, but a lot of this knowledge came from wikipedia and pages linked from it - do a search :) 82.46.180.56 (talk) 02:35, 27 December 2007 (UTC)

[edit] Fair use rationale for Image:DSDlogo.gif

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BetacommandBot (talk) 06:36, 2 January 2008 (UTC)

[edit] DSD64, DSD128, and DXD

These variants of DSD are of interest and should be added by someone who knows about them much better than me. —Preceding unsigned comment added by 78.105.11.183 (talk) 00:28, 11 April 2008 (UTC)