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SACD decoder options
Anakunda
post Dec 13 2011, 18:14
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Hello,

perhaps somebody can explain meaning of SACD decoder options.

ASIO Driver mode: PCM / DSD (Autodetect) difference
and
DSD2PCM mode: Multistage (fixed point) / Multistage (floating point) / Direct (Floating point, 30kHz LF) difference

I'm utterly aimed to get highest quality for converter..

What's the native sampling frequency for SACD? I have 4 choices which 44.1 is too low, but there are higher. I intuiitionally choosed 88.2kHz but not sure if this still isnot downsampling the undecoded audio. I need a value that won't up/downsample the audio any way and extracts in the same reate as original. Thankyou.
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NiPP0
post Apr 7 2012, 21:44
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2822.4/24=117.6... 117.6KHz isn't a rate so we have to do 2822.4/32=88.2. I don't think the plug-in outputs 32-bit, so it would have to be converted to 24-bit. This would keep about 75% (24/32) of the DSD's audio data. Going to 96/24 wouldn't be a good idea, so 176.4/24 would be the next step up. This would be overkill by about 50% (2822.4/176.4=24, 24/16=1.5).

I'm sure DSD -> PCM conversion algorithms will keep being improved, so while I planned on doing 176.4/24 FLAC I'm thinking it would be better to do 88.2/24 and keep the .DFF/.DSD/SACD .ISO. Remember that even at 352.8/24 conversion can't be considered lossless.

When editing an image (lossless or not) I prefer to down-sample the final output slightly rather than up-sample it. This is based on the fact the original image may have slightly less than optimum spatial resolution, so downsampling gives me the feeling that the ouput is 'honest' (contains as much data as it should).

Any ideas on the dithering question?

NiPP0

This post has been edited by NiPP0: Apr 7 2012, 22:16
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lvqcl
post Apr 7 2012, 23:58
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QUOTE (NiPP0 @ Apr 8 2012, 00:44) *
2822.4/24=117.6... 117.6KHz isn't a rate so we have to do 2822.4/32=88.2. I don't think the plug-in outputs 32-bit, so it would have to be converted to 24-bit. This would keep about 75% (24/32) of the DSD's audio data.

So you divided a samplerate by a bit depth?
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Posts in this topic
- Anakunda   SACD decoder options   Dec 13 2011, 18:14
- - lvqcl   QUOTE ASIO Driver mode: PCM / DSD (Autodetect) dif...   Dec 13 2011, 18:33
|- - Anakunda   QUOTE (lvqcl @ Dec 13 2011, 18:33) QUOTE ...   Dec 13 2011, 18:37
- - NiPP0   Currently I use the 'Multi-Stage (Double Preci...   Apr 7 2012, 01:07
|- - NiPP0   Edit 2: Can anybody confirm that Multi-Stage (Doub...   Apr 7 2012, 21:39
- - SoNic67   SACD is an optical support that holds an "enc...   Apr 7 2012, 05:29
|- - Anakunda   QUOTE (SoNic67 @ Apr 7 2012, 06:29) As qu...   Apr 7 2012, 09:00
- - lvqcl   Do you know what the orginal samplerete is?   Apr 7 2012, 09:48
- - Sandrine   Guys, the discussion you're having here is som...   Apr 7 2012, 12:03
- - NiPP0   2822.4/24=117.6... 117.6KHz isn't a rate so we...   Apr 7 2012, 21:44
|- - lvqcl   QUOTE (NiPP0 @ Apr 8 2012, 00:44) 2822.4/...   Apr 7 2012, 23:58
|- - SoNic67   QUOTE (NiPP0 @ Apr 7 2012, 16:44) 2822.4/...   Apr 8 2012, 00:39
|- - lvqcl   QUOTE (SoNic67 @ Apr 8 2012, 03:39) Actua...   Apr 8 2012, 09:42
- - Anakunda   I think mine foobar shows an astronomic samplerate...   Apr 8 2012, 00:02
|- - kode54   QUOTE (Anakunda @ Apr 7 2012, 16:02) I th...   Apr 8 2012, 00:56
- - SoNic67   I ment to say that information carried is the same...   Apr 10 2012, 04:03
- - NiPP0   Sorry to keep asking, but does dithering need to b...   Apr 13 2012, 15:00
- - lvqcl   I tested it (ver. 0.5.3), and it outputs samples i...   Apr 13 2012, 15:58
|- - NiPP0   QUOTE (lvqcl @ Apr 13 2012, 15:58) I test...   Apr 14 2012, 17:59
|- - NiPP0   Done some more reading... from what I gather DSD -...   Apr 29 2012, 22:38
- - Anakunda   Can I know how does the new decoding mode (Install...   Sep 5 2012, 10:35


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