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DSD-2-PCM -- proof of concept, test sample and source code here
SebastianG
post Oct 8 2005, 23:55
Post #1





Group: Developer
Posts: 1318
Joined: 20-March 04
From: Göttingen (DE)
Member No.: 12875



The ZIP contains 4 files:
- dsd2pcm.jar (the converter written in Java, outputs raw 24/88 PCM, intel byte order)
- info.txt (contains some infos)
- test2822k.dsd (14 seconds, mono DSD, 5 megs)
- test44k.mp3 (conversion result)

have fun,
Sebi

Edit-2011: For the latest C/C++ source code see https://code.google.com/p/dsd2pcm/ It is released under the new BSD license. The attatchment to this post is still the first Java release.



This post has been edited by SebastianG: Dec 4 2011, 17:45
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LukeS
post Nov 24 2009, 21:39
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QUOTE (rpp3po @ Nov 24 2009, 08:01) *
The problem with the "most accurate capture" is that DSD players do 'know' that terrible amounts of noise are there and their analog low-pass probably reaches far enough down to compensate somewhat. PCM doesn't have this problem, a good 96 kHz DAC will roughly output at least 40 kHz of perfect analog bandwidth. This would be a capture of the full digital DSD signal, but probably not an accurate capture of the equivalent DSD low passed 'experience'.

My Denon player has a setting labled "SACD Filter" which can be set to 50kHz or 100kHz. I do not know what it is set to because I just got the player used a few days ago and it doesn't have a remote so I do not have access to the menu. I have ordered a remote and once it comes I will go through and turn off any audio post processing options I can. It the option is set to 50kHz, changing it to 100kHz may help with some of the noise I am getting.

I am very new to the SACD format but I am interested in picking up a second hand SACD player that outputs DSD over HDMI and trying to grab the DSD signals before they get encrypted and sent over HDMI, it may offer a less altered signal.


QUOTE (Canar @ Nov 24 2009, 09:49) *
I'd suggest keeping the originals as un-converted DSD and just decode to PCM on the fly using a foobar2000 component or something. I'm not sure that one exists currently, but having a library of lossless DSD material is probably preferable to the same material in PCM-decoded form. One less source of loss...

My plan exactly, I will keep the originals for archival purposes and make a copy that is converted it to a lossless PCM format like FLAC if a good conversion becomes available.

QUOTE (rpp3po @ Nov 24 2009, 11:23) *
Raw DSD means saving about 3 GB per 70 minute stereo album. Kind of a waste when you can save 48kHz files, that should perfectly* preserve the 0-22 kHz band, and only need about 475 MB (FLAC). That's over 2.5 GB wasted, not for discarded but inaudible recorded information but plain quantization distortion, added by an inferior form of digitalization. Why save 2.5 GB of garbage per album? Has there ever been just one solid positive blind test for DSD?

* talk about differences of -110db or lower

A couple things here...
48kHz files do not preserve 0-22kHz band perfectly, the brick wall effect means that the high pass filters have to cut into much lower frequencies for seamless playback.

Storage is cheap nowadays and will keep getting cheaper, I keep all my music on a NAS server. You can buy a 1.5TB drives for less then $100 each which is about 500 SACD albums depending how many tracks they have one them and over then next few years it will cost even less to store.

There is one important feature of SACDs that CD's do not offer, multi channel audio. Many albums do not have any other multichannel format like DVD-A, blu-ray so SACD is the only option.

Also the storage could be greatly reduced is a loss less container format was made to store the raw DSD channels.

This post has been edited by LukeS: Nov 24 2009, 21:50
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Posts in this topic
- SebastianG   DSD-2-PCM -- proof of concept   Oct 8 2005, 23:55
- - skamp   Now you need to develop a DVD-ROM driver for readi...   Oct 9 2005, 01:27
|- - SebastianG   QUOTE (skamp @ Oct 9 2005, 01:27 AM)Now you n...   Oct 9 2005, 10:32
|- - SebastianG   Oh, I noticed a small bug: The dsd file size must ...   Oct 9 2005, 11:06
- - tarsier   So is it theoretically possible to convert the PCM...   Dec 24 2006, 20:33
|- - putanik   QUOTE (tarsier @ Dec 24 2006, 13:33) So i...   Dec 24 2006, 22:54
|- - tarsier   Thanks for the link. But right now, I'm only ...   Dec 26 2006, 16:28
|- - Kees de Visser   QUOTE (tarsier @ Dec 26 2006, 16:28) In d...   Dec 26 2006, 19:03
- - andyshedd   I'm mildly curious how this method compares an...   Jan 8 2007, 22:44
- - frenchglen   Is there any updated info about this program? I tr...   Jun 8 2009, 15:23
- - LukeS   I am bringing this back form years of being dead. ...   Nov 23 2009, 15:56
- - GeSomeone   I think it's in the first post. QUOTE (Sebasti...   Nov 23 2009, 19:12
|- - SebastianG   QUOTE (GeSomeone @ Nov 23 2009, 19:12) I ...   Nov 23 2009, 20:31
- - LukeS   SebastianG, Awesome job on the program, my proble...   Nov 23 2009, 22:32
|- - vincefalks   I am not an expert but it would be cool to compare...   Nov 24 2009, 00:17
|- - rpp3po   What would be a higher quality approach than 1. co...   Nov 24 2009, 02:48
- - SebastianG   QUOTE (LukeS @ Nov 23 2009, 22:32) The ou...   Nov 24 2009, 10:38
- - 2Bdecided   With the huge caveat that I made no attempt to do ...   Nov 24 2009, 12:40
- - vincefalks   The noise is indeed a problem with the DSD format ...   Nov 24 2009, 13:07
|- - rpp3po   The problem with the "most accurate capture...   Nov 24 2009, 14:01
|- - vincefalks   QUOTE (rpp3po @ Nov 24 2009, 15:01) The p...   Nov 24 2009, 14:25
||- - Canar   QUOTE (vincefalks @ Nov 24 2009, 08:25) I...   Nov 24 2009, 15:49
||- - rpp3po   Raw DSD means saving about 3 GB per 70 minute ster...   Nov 24 2009, 17:23
||- - BOBCHEWIE   QUOTE (rpp3po @ Nov 24 2009, 10:23) Raw D...   Jan 3 2010, 12:14
||- - rpp3po   QUOTE (BOBCHEWIE @ Jan 3 2010, 12:14) scr...   Jan 3 2010, 14:15
||- - Axon   QUOTE (BOBCHEWIE @ Jan 3 2010, 05:14) QUO...   Jan 3 2010, 14:22
||- - Martel   QUOTE (BOBCHEWIE @ Jan 3 2010, 12:14) ......   Jan 4 2010, 09:53
|- - Mike Giacomelli   QUOTE (rpp3po @ Nov 24 2009, 08:01) DSD h...   Nov 24 2009, 15:46
- - LukeS   QUOTE (rpp3po @ Nov 24 2009, 08:01) The p...   Nov 24 2009, 21:39
|- - rpp3po   QUOTE (LukeS @ Nov 24 2009, 21:39) 48kHz ...   Nov 25 2009, 03:00
||- - LukeS   QUOTE (rpp3po @ Nov 24 2009, 21:00) QUOTE...   Nov 25 2009, 04:20
||- - Mike Giacomelli   QUOTE (LukeS @ Nov 24 2009, 22:20) QUOTE ...   Nov 25 2009, 05:25
||- - LukeS   QUOTE (Mike Giacomelli @ Nov 24 2009, 23...   Nov 25 2009, 05:29
||- - Mike Giacomelli   QUOTE (LukeS @ Nov 24 2009, 23:29) Also I...   Nov 25 2009, 05:55
|- - vincefalks   QUOTE (LukeS @ Nov 24 2009, 22:39) I am v...   Nov 25 2009, 08:02
|- - knutinh   QUOTE (LukeS @ Nov 24 2009, 21:39) Also t...   Nov 25 2009, 08:36
- - Axon   Look into the dynamic range of SACD at 22khz somet...   Nov 24 2009, 21:56
- - Axon   Yes, let's all thank LukeS for being a boy sco...   Nov 25 2009, 04:59
|- - LukeS   QUOTE (Axon @ Nov 24 2009, 22:59) Yes, le...   Nov 25 2009, 05:21
||- - Martel   QUOTE (LukeS @ Nov 25 2009, 05:21) The bo...   Nov 25 2009, 10:24
|- - 2Bdecided   QUOTE (Axon @ Nov 25 2009, 03:59) Sorry f...   Nov 25 2009, 12:13
|- - udauda   QUOTE (Axon @ Nov 24 2009, 19:59) You...   Nov 26 2009, 02:31
|- - 2Bdecided   QUOTE (udauda @ Nov 26 2009, 01:31) Does ...   Nov 26 2009, 11:46
|- - vincefalks   QUOTE (2Bdecided @ Nov 26 2009, 12:46) Li...   Nov 26 2009, 12:02
|- - rpp3po   Yawn! Am I really the last one to get where t...   Nov 26 2009, 12:37
|- - vincefalks   QUOTE (rpp3po @ Nov 26 2009, 13:37) Yawn...   Nov 26 2009, 13:10
|- - rpp3po   At least you seem believe the life-like-analog-sou...   Nov 26 2009, 13:25
|- - vincefalks   QUOTE (rpp3po @ Nov 26 2009, 14:25) At le...   Nov 26 2009, 13:40
- - LukeS   QUOTE (vincefalks @ Nov 25 2009, 02:02) Q...   Nov 25 2009, 09:16
|- - SebastianG   QUOTE (LukeS @ Nov 25 2009, 09:16) See th...   Nov 25 2009, 10:32
|- - knutinh   QUOTE (LukeS @ Nov 25 2009, 09:16) DST wo...   Nov 25 2009, 18:02
|- - simmconn   QUOTE DST would work but I have not found a no low...   Nov 26 2009, 01:31
|- - vincefalks   QUOTE (simmconn @ Nov 26 2009, 02:31) QUO...   Nov 26 2009, 03:38
- - rpp3po   Sorry, if I didn't express myself clearly enou...   Nov 25 2009, 12:04
- - Axon   It's a surprisingly well known mod, actually. ...   Nov 25 2009, 19:38
|- - rpp3po   I find it interesting, nevertheless. What equipmen...   Nov 25 2009, 20:38
- - LukeS   Wow, I really am messing thing up lately ; I got ...   Nov 26 2009, 07:27
|- - simmconn   And I just spent one and a half hours to encode an...   Nov 26 2009, 08:16
- - 2Bdecided   Yes, the distortions of SACD are inaudible. Especi...   Nov 26 2009, 15:57
- - Canar   So that's what they mean by "warm" s...   Nov 26 2009, 16:22
- - Axon   If SACD really did have a similar distortion profi...   Nov 26 2009, 21:14
- - SebastianG   Just for kicks and giggles I rewrote most of ...   Nov 27 2009, 03:26
|- - vincefalks   QUOTE (SebastianG @ Nov 27 2009, 03:26) J...   Nov 27 2009, 03:44
|- - SebastianG   QUOTE (vincefalks @ Nov 27 2009, 03:44) T...   Nov 27 2009, 04:14
||- - vincefalks   QUOTE (SebastianG @ Nov 27 2009, 04:14) S...   Nov 27 2009, 05:11
||- - Kees de Visser   There seems to be a growing (niche) market for onl...   Nov 27 2009, 09:02
||- - 2Bdecided   QUOTE (vincefalks @ Nov 27 2009, 04:11) N...   Nov 27 2009, 10:59
||- - rpp3po   QUOTE (vincefalks @ Nov 27 2009, 05:11) N...   Nov 27 2009, 12:55
|||- - 2Bdecided   QUOTE (rpp3po @ Nov 27 2009, 11:55) An an...   Nov 27 2009, 13:00
||- - krabapple   QUOTE (vincefalks @ Nov 26 2009, 23:11) T...   Nov 29 2009, 03:56
|- - rpp3po   QUOTE (vincefalks @ Nov 27 2009, 03:44) H...   Nov 27 2009, 04:16
- - LukeS   QUOTE (SebastianG @ Nov 26 2009, 21:26) J...   Nov 27 2009, 07:33
|- - smack   QUOTE (LukeS @ Nov 27 2009, 07:33) Window...   Nov 27 2009, 11:00
- - .halverhahn   DXD is PCM - just with a bunch of noise above 48kH...   Nov 27 2009, 15:34
|- - rpp3po   Wow! The DXD track is certainly nothing Bruce ...   Nov 27 2009, 17:47
- - spoon   As the noise is constant this shows the levels qui...   Nov 29 2009, 20:54
- - spoon   QUOTE The final amusing aspect to all this is that...   Nov 29 2009, 22:51
|- - krabapple   QUOTE (spoon @ Nov 29 2009, 16:51) QUOTE ...   Nov 30 2009, 06:33
- - spoon   Based on Sebastians good work I have wrapped the d...   Dec 1 2009, 17:49
- - kode54   @spoon: I presume you modified the stage 1 filter ...   Dec 1 2009, 19:55
- - spoon   I thought it was a command line option on dsd2pcm?   Dec 1 2009, 20:15
|- - kode54   QUOTE (spoon @ Dec 1 2009, 11:15) I thoug...   Dec 7 2009, 15:32
- - krabapple   This is all peachy for those recording DSD files o...   Dec 2 2009, 06:56
|- - BOBCHEWIE   QUOTE (krabapple @ Dec 1 2009, 23:56) Thi...   Jan 3 2010, 13:33
- - spoon   I might be wrong, but I do not think there are any...   Dec 2 2009, 09:55
|- - krabapple   QUOTE (spoon @ Dec 2 2009, 03:55) I might...   Dec 2 2009, 17:23
- - Martel   QUOTE There are three types of SACDs[9]: * Hy...   Dec 2 2009, 10:35
- - .halverhahn   Just for your information: Wheatus is offering The...   Dec 2 2009, 11:38
|- - 2Bdecided   QUOTE (.halverhahn @ Dec 2 2009, 10:38) J...   Dec 2 2009, 15:11
- - vincefalks   Ok finally my warning was lifted after a little si...   Dec 7 2009, 17:55
|- - krabapple   QUOTE (vincefalks @ Dec 7 2009, 11:55) QU...   Dec 7 2009, 18:26
|- - 2Bdecided   QUOTE (vincefalks @ Dec 7 2009, 16:55) I...   Dec 7 2009, 18:33
|- - spoon   Did anyone manage to decode a .dsf file? (such as ...   Dec 8 2009, 10:21
- - Martel   A (square analog) pulse has an infinitely wide spe...   Dec 7 2009, 18:26
- - udauda   I wonder, how come Pro-DSD never comes up with a s...   Jan 4 2010, 13:39
- - rpp3po   Excellent paper, thanks!   Jan 4 2010, 14:31
- - krabapple   I remember this one from a few years back....I for...   Jan 8 2010, 22:05
- - ElfeJoyeux   Hello, I just discovered this awesome topic durin...   Mar 11 2010, 22:34
|- - Hobbit13   QUOTE (ElfeJoyeux @ Mar 11 2010, 22:34) T...   Jul 19 2010, 10:48
- - Sik_Lescinovid   Has anyone so far noticed that when creating a 24 ...   Nov 27 2011, 18:28
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