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

Attached File(s)

 dsd2pcm.zip ( 3.56MB ) Number of downloads: 2488

 

[SebastianG]

The output 88200Hz PCM has a hiss and static on it as you mentioned in your post. Is there a command line switch to output at the first stage 352kHz

No. That would not even help because the bit order affects the first stage. You could try to add a switch to enable/disable the "pre stage 1 bitreversal".

I will try an figure out how to extract the jar, look at the code, and see if I can tinker with it.

Just unzip it. .jar files are really .zip files with some added meta informations.

rpp3po is right. There's not a lot you can do differently in a mathematical sense than to pick other low pass filters. (Of course, the implementation might differ.) I even documented the properties of the two low pass filters. The paranoid user should be pleased with the 170 dB (IIRC) stopband rejection of the first stage. The lowpass filter's roll off starts at something around 25 kHz (IIRC). That's IMHO high enough because there's already an awful lot of noise just above it. (The DSD propaganda tells you that DSD has a "great dynamic range". That only applies to frequencies below 20kHz which is not surprizing).

Cheers,
SG

This post has been edited by SebastianG: Nov 24 2009, 10:41