DSD-2-PCM -- proof of concept, test sample and source code here Options

[SebastianG]

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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 dsd2pcm.zip ( 3.56MB ) Number of downloads: 2487

 

[LukeS]

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.

I myself am not the biggest technical expert on the mathematics of PCM or DSD, but I thought nothing can be altered to the signal within the (digital) DSD domain - only at analog/PCM stage of the player, maybe. I might be wrong though. There certainly are other players which do not cut off ultra high freuencies like that Denon.

See the attached a screen shot from the Denon DVD-955 / DVD-2910 manual, there is some filtering going on in the player. Either this is an option that is set on the DACs (most likely I would think), in the analog circuity, or the Denon player post-processes the DSD signal and applies a 50kHz or 100kHz filter before sending it to the DACs. If this is the case it is probably done in the sony DSD chip but it would seem to be way to processing intensive to do so and is probably done in the analog domain. I have some digging to do in the DAC datasheet to find out exactly.

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

Well THAT sir, is DST - it's like MLP for PCM/DVD-A. Currently, only rare pro applications can encode DST, but I hope in future we will have acces to such a facility.

Haha, yea that's the problem, I don't have thousands of dollars or access to pro tools

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

I think that LPCM offers lossless, uncompressed output from available, high-quality ADCs.

FLAC offers lossless compression of LPCM.

DSD offers unprocessed storage*) of ADCs that are no longer viable. For all other cases, it is simply a bad trade-off between filesize and quality.

DST offers lossless compression of DSD.

http://en.wikipedia.org/wiki/Sacd#DST

-k

*)This is a benefit invented by PR and poorly educated audiophiles.

DST would work but I have not found a no low cost or free software to convert raw DSD to DST or to combine the 6 mono DSD files captured and compress them in a DST file. There is no mainstream information no how to rip the DST \ DSF files on the SACD so that option is out.

FLAC and others are PCM formats and I would like to compress the raw DSD files I capture so those formats are out. ZIP works but it is not optimized for DSD, it will do until I can do something with the DSD files anyways. If a free or low cost tool comes about to convert DSD to PCM or if I figure out why the program SebastianG is not liking my DSD files I will store the converted PCM output in FLAC. I may just end up buying a player that converts the DSD to high sample rate LPCM, grab the unencrypted signals in the player, save that to FLAC, and be done with it.

This post has been edited by LukeS: Nov 25 2009, 09:49

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