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24bit PCM compress
yg2003618
post Nov 25 2010, 10:22
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anyone knows about how to compress 24bit PCM 48Khz audio, I know that most codecs process 16bit pcm. i want compress 24bit PCM at real time, 3:1 or 4:1 compress rate. who can help me? i know that subband adpcm maybe a choice. anyone knows more about that?

thanks alot.
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Engelsstaub
post Nov 26 2010, 09:32
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Doesn't compressing a 24-bit file to a lossy codec (other than a hybrid like WavPack) theoretically defeat the supposed benefits of DVD Audio quality? I'm seriously wondering. I was a bit confused before, of course, but this has me more befuddled. I've never heard of such a want or need and wonder why one would do this.

I guess what I mean is: wouldn't just converting this to a 16-bit lossy file be about the same? AFAIK the lossy codecs will discard most of the stuff that's supposed to be in the 24-bit range. (Sorry if my terminology is imprecise or if my question seems too novice. I come to HA because I'm not that knowledgeable about some of the things most of you are and am trying to learn rather than "teach.")

I've been looking online for a solution to your question but the only thing I can find is Wavpack as soiaf pointed out.

Edited for a grammatical error.

This post has been edited by Engelsstaub: Nov 26 2010, 10:17


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knutinh
post Nov 26 2010, 11:16
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QUOTE (Engelsstaub @ Nov 26 2010, 09:32) *
Doesn't compressing a 24-bit file to a lossy codec (other than a hybrid like WavPack) theoretically defeat the supposed benefits of DVD Audio quality? I'm seriously wondering. I was a bit confused before, of course, but this has me more befuddled. I've never heard of such a want or need and wonder why one would do this.

I guess what I mean is: wouldn't just converting this to a 16-bit lossy file be about the same? AFAIK the lossy codecs will discard most of the stuff that's supposed to be in the 24-bit range. (Sorry if my terminology is imprecise or if my question seems too novice. I come to HA because I'm not that knowledgeable about some of the things most of you are and am trying to learn rather than "teach.")

I've been looking online for a solution to your question but the only thing I can find is Wavpack as soiaf pointed out.

Edited for a grammatical error.

If the question is "what is the perceptually best quality that one can get within a 500kbps limitation", 16 bit/44.1kHz flac seems like a sensible choice. If doing lossy encoding at >16bit or >44.1kHz sampling rate, what will the psycho acoustic model be to exploit the extra information? Of course, one could extend/extrapolate knowledge about what is/isnt important inside the audible window, and hope that it somehow makes sense outside.

FLAC may not be within latency, processing requirements though.

Does it have to be robust against transmission errors (I guess yes)? For really, really low total latency, anything fancy is out of the question.

-k

This post has been edited by knutinh: Nov 26 2010, 11:19
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Posts in this topic
- yg2003618   24bit PCM compress   Nov 25 2010, 10:22
- - Engelsstaub   You can use dBpoweramp or Foobar 2000. I'm cer...   Nov 25 2010, 10:37
|- - googlebot   QUOTE (Engelsstaub @ Nov 25 2010, 10:37) ...   Nov 25 2010, 11:12
|- - Engelsstaub   QUOTE (googlebot @ Nov 25 2010, 04:12) QU...   Nov 25 2010, 23:15
|- - googlebot   QUOTE (Engelsstaub @ Nov 25 2010, 23:15) ...   Nov 26 2010, 01:07
- - soiaf   WavPack (lossy/hybrid mode) will certainly handle ...   Nov 25 2010, 22:27
- - romor   ^ Can you believe this guy? Is that old D.R.I. log...   Nov 25 2010, 23:55
|- - Engelsstaub   QUOTE (romor @ Nov 25 2010, 16:55) ^ Can ...   Nov 26 2010, 04:14
- - yg2003618   thanks everyone, my project is using an ARM7 cpu t...   Nov 26 2010, 03:09
|- - saratoga   QUOTE (yg2003618 @ Nov 25 2010, 21:09) th...   Nov 26 2010, 05:57
|- - yg2003618   QUOTE (saratoga @ Nov 26 2010, 06:57) QUO...   Nov 26 2010, 07:17
|- - saratoga   QUOTE (yg2003618 @ Nov 26 2010, 01:17) QU...   Nov 26 2010, 16:59
- - yg2003618   Nero AAC may do 24bit compress, but i need source ...   Nov 26 2010, 03:20
- - Engelsstaub   Doesn't compressing a 24-bit file to a lossy c...   Nov 26 2010, 09:32
|- - knutinh   QUOTE (Engelsstaub @ Nov 26 2010, 09:32) ...   Nov 26 2010, 11:16
|- - googlebot   QUOTE (Engelsstaub @ Nov 26 2010, 09:32) ...   Nov 26 2010, 19:56
|- - knutinh   QUOTE (googlebot @ Nov 26 2010, 19:56) Wh...   Nov 26 2010, 20:56
- - Engelsstaub   Thanks for the explanation, knutinh. I failed to ...   Nov 26 2010, 14:52
- - [JAZ]   Mmm... 1152kbps for 24bit 48Khz is a mono signal. ...   Nov 26 2010, 19:10
- - googlebot   It depends, if high dynamic range is a top priorit...   Nov 26 2010, 21:26
|- - saratoga   QUOTE (googlebot @ Nov 26 2010, 15:26) It...   Nov 26 2010, 21:42
|- - googlebot   QUOTE (saratoga @ Nov 26 2010, 21:42) I t...   Nov 26 2010, 21:54
|- - saratoga   QUOTE (googlebot @ Nov 26 2010, 15:54) Co...   Nov 26 2010, 22:39
- - googlebot   I've read it again. Maybe you are right. Even ...   Nov 26 2010, 23:43
- - yg2003618   CELT is the answer! thank you, thank you every...   Nov 27 2010, 00:48


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