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16 bit vs 24 bit, any samples that work?
AndyH-ha
post Nov 3 2006, 03:19
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There are real differences between 16 bit and 24 bit files, just as there are real differences between uncompressed and mp3. As with the differences between wav and mp3, 16 bit vs 24 bit is often difficult to identify by listening.

Test signals are one thing, but has anyone found any 24 bit music recording that can be successfully identified via ABX testing against a properly resample to 16 bit version of same?
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knutinh
post Feb 27 2008, 10:43
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Since DVD-A can now be ripped, having 24/96 stereo material is not an issue.

The success of 16 vs 12 bit tests should tell us a lot about the prospect of 24 vs 16 being detactable, I cant understand why those arent properly discussed.

The line between test-signal and music is blurred when you search for killer-samples. Lets just say something like "any snip of sound less than 30s long that is normalised to 0dB FS and still comfortable to listen to?"

Caution
Is it concievable that the 24bit version might sound different but worse than dithered 16bits in some PCs if 24 bits was truncated to 16 bits by soundcard/OS?

-k
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Kees de Visser
post Feb 27 2008, 11:51
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QUOTE (knutinh @ Feb 27 2008, 10:43) *
Caution
Is it concievable that the 24bit version might sound different but worse than dithered 16bits in some PCs if 24 bits was truncated to 16 bits by soundcard/OS?
Good point. Any playback chain that is not capable of processing 24 bits correctly is not suitable for this kind of testing.
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bubbleguuum
post Feb 27 2008, 20:32
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QUOTE (Kees de Visser @ Feb 27 2008, 11:51) *
QUOTE (knutinh @ Feb 27 2008, 10:43) *
Caution
Is it concievable that the 24bit version might sound different but worse than dithered 16bits in some PCs if 24 bits was truncated to 16 bits by soundcard/OS?
Good point. Any playback chain that is not capable of processing 24 bits correctly is not suitable for this kind of testing.


An you should prove the playback chain is really 24 bit capable (ie not rely only on the specs of the hardware/software).
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MLXXX
post Feb 28 2008, 10:11
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QUOTE (volvme+ @ Feb 28 2008, 04:27) *
Sorry for interrupting your conversation, but I don't want to create another topic only for this:
I would like to know if there is any difference in playing 16bit lossless file with 24bit or 16bit output format (i use foobar). Is there also a difference (degreed/improved/same quality) for lossy formats? And while my card support 24bit output, should I use it instead of 16bit.
Almost all my files are 16bit flacs, but I need some space so I'll rip my cds with mp3 until I get a new hdd.

I'll try to answer this.

With the gliding tone examples at http://64.66.184.67/technical/bits44/index.htm on the PC ABX Web Site using foobar in ABX mode and set so as to play only the last few seconds of the samples (i.e. the quietest part), setting the foobar output at 24-bits seemed to give the best performance. What I found was as follows:-

The result with the option set to '24-bits' was good for sample 1.1.2 (16-bit dithered). The dithering algorithm used for preparing the sample must have been of good quality. Switching the output option to 16 bits gave a much noisier result (and this was much the same result whether or not dither was selected as an output option in the foobar preferences).

With sample 1.1.11 (16-bit, not dithered), artefacts were more noticeable (spurious whistles) on my setup (an Audigy 4 with external hub) than with sample 1.1.2.

Setting the foobar output to 24-bits gave the quietest output. Setting the output to 16-bits increased the noise (somewhat hiding the whistles). There was little difference between setting the foobar output dither to on rather than off.


With playing of 16-bit music more generally, I don't see why it should make much difference whether the codec is lossy or lossless. If it is lossless but derived from a source digital recording at more than 16 bits the source needs to be reduced to 16-bits resolution somehow using dither, rounding, or -- conceivably -- truncation. It has to be remembered that 16-bit 'lossless' still has the limitations of 16-bits: it is a perfect copy of a 16-bit resolution approximation. The question we are trying to answer in this thread is whether that approximation is so good that no difference can be detected between 16 bits and a greater number of bits when listening to music. I think it must be assumed that the gain used when listening to the test extract cannot be unrealistically high. By unrealistically high, I mean that the loudest parts of the music must not be unbearably loud when played back with the same gain setting used to listen to the test extract.

It is trivial to prove that 24-bit music sounds different to 16-bit music if the 24-bit source has a very high signal to noise ratio, part of the performance is extremely quiet, and that part of the performance is listened to at an unrealistically high gain setting.

QUOTE (bubbleguuum @ Feb 28 2008, 05:32) *
QUOTE (Kees de Visser @ Feb 27 2008, 11:51) *

QUOTE (knutinh @ Feb 27 2008, 10:43) *
Caution
Is it concievable that the 24bit version might sound different but worse than dithered 16bits in some PCs if 24 bits was truncated to 16 bits by soundcard/OS?
Good point. Any playback chain that is not capable of processing 24 bits correctly is not suitable for this kind of testing.


An you should prove the playback chain is really 24 bit capable (ie not rely only on the specs of the hardware/software).

Choosing a quiet part of a high signal to noise ratio 24-bit sample should enable the noise level to be assessed. When 16 bit sound-card mode is selected, background noise should rise quite substantially compared with operating the card in 24 bit mode. Foobar conveniently makes the output bit-depth selectable and also allows playback to be confined to just a selected part of a file.

Obviously this is only a rough and ready test, but it may be sufficient to indicate that the system is operating at more than 16 bits.

This post has been edited by MLXXX: Feb 28 2008, 23:56
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Posts in this topic
- AndyH-ha   16 bit vs 24 bit   Nov 3 2006, 03:19
- - Mike Giacomelli   I'd imagine ABX would be possible if you found...   Nov 3 2006, 03:25
- - pdq   I recall a test here some years back to try to see...   Nov 3 2006, 05:33
- - Aetmos   If the clip is properly dithered, this doesn't...   Nov 3 2006, 06:22
- - cabbagerat   QUOTE (Aetmos @ Nov 2 2006, 21:22) If the...   Nov 3 2006, 07:31
|- - Aetmos   QUOTE Welcome to HA. I see this is your first post...   Nov 3 2006, 16:17
- - AndyH-ha   I agree that a good sample, if it exist in music, ...   Nov 3 2006, 09:36
- - cabbagerat   QUOTE (AndyH-ha @ Nov 3 2006, 00:36)...   Nov 3 2006, 16:25
- - Axon   I suppose it's quite easy to construct a track...   Nov 3 2006, 17:48
- - Axon   Also, how contrived can the listening environment ...   Nov 3 2006, 18:03
- - AndyH-ha   The question isn't whether or not it is possib...   Nov 3 2006, 20:18
- - Axon   Well.. how much dynamic range can you coax out of ...   Nov 3 2006, 20:38
- - AndyH-ha   I'm sorry, that went over my head. What is the...   Nov 3 2006, 21:21
- - outscape   haha nothing.. see 24 bits is purist technology. i...   Nov 3 2006, 22:23
- - greynol   I'd wager that in order to distinguish the dif...   Nov 3 2006, 22:41
- - Axon   OSHA's recommendations for 120db is that it sh...   Nov 4 2006, 01:11
- - AndyH-ha   But are you talking about real music or, effective...   Nov 4 2006, 01:56
- - Axon   My point is that you don't need a "test s...   Nov 4 2006, 02:21
- - AndyH-ha   OK, you need more than the dynamic range of 16 bit...   Nov 4 2006, 04:09
- - Iain   I think the best volume for the test would be ...   Nov 12 2006, 17:14
- - AndyH-ha   Without cryogenic cooling the intrinsic noise of e...   Nov 12 2006, 19:23
- - SebastianG   I think it's a good idea to mention the import...   Nov 13 2006, 13:30
- - AndyH-ha   QUOTE I think it's a good idea to mention the ...   Nov 14 2006, 03:43
|- - SebastianG   QUOTE (AndyH-ha @ Nov 14 2006, 03:43...   Nov 15 2006, 14:16
- - SirChristof   If you have decent equipment and a quiet environme...   Feb 15 2007, 09:40
|- - Kees de Visser   QUOTE (SirChristof @ Feb 15 2007, 09:40) ...   Feb 15 2007, 22:15
- - AndyH-ha   Yes, it is easy to create test tones that demonstr...   Feb 15 2007, 11:52
- - SirChristof   The vast majority of all music most of us have acc...   Feb 15 2007, 20:17
|- - krabapple   QUOTE (SirChristof @ Feb 15 2007, 14:17) ...   Feb 16 2007, 06:07
- - SometimesWarrior   These articles on ff123's website may be of in...   Feb 15 2007, 21:41
- - greynol   QUOTE (SirChristof @ Feb 15 2007, 00:40) ...   Feb 15 2007, 21:48
- - SirChristof   Greynol, What I meant to imply by "at low le...   Feb 15 2007, 22:02
- - AndyH-ha   As far as I can see, the ff123 page does not provi...   Feb 16 2007, 08:17
|- - Kees de Visser   At least one of the engineers I've asked seems...   Feb 16 2007, 11:01
- - muaddib   IMO it is better to keep samples much shorter: 10-...   Feb 16 2007, 11:54
- - 2Bdecided   There are a few 24/96 and 24/44.1 files here: http...   Feb 16 2007, 12:07
- - AndyH-ha   Setting aside for the moment whether this donated ...   Feb 16 2007, 12:22
|- - Kees de Visser   QUOTE (AndyH-ha @ Feb 16 2007, 12:22...   Feb 16 2007, 15:10
|- - Kees de Visser   An ABX test to compare 16 and 24 bit dithered audi...   Feb 19 2007, 23:00
- - AndyH-ha   I believe the resampling is more important than th...   Feb 20 2007, 00:30
- - MLXXX   Hi everyone. A year has passed since the previous...   Feb 25 2008, 16:52
- - AndyH-ha   "sounding better" is a subjective evalua...   Feb 26 2008, 00:52
- - MLXXX   I am new to ABXing but I think that for playing 24...   Feb 26 2008, 15:25
- - .halverhahn   Even it is comparing apples with oranges: Do you ...   Feb 26 2008, 17:28
- - digital   Wow: Nov 2nd 2006 to Feb 27th, 2008 and still wai...   Feb 27 2008, 10:37
- - knutinh   Since DVD-A can now be ripped, having 24/96 stereo...   Feb 27 2008, 10:43
|- - Kees de Visser   QUOTE (knutinh @ Feb 27 2008, 10:43) Caut...   Feb 27 2008, 11:51
|- - bubbleguuum   QUOTE (Kees de Visser @ Feb 27 2008, 11:5...   Feb 27 2008, 20:32
|- - MLXXX   QUOTE (volvme+ @ Feb 28 2008, 04:27)...   Feb 28 2008, 10:11
- - GeSomeone   I remember remarks (don't know where) that ind...   Feb 27 2008, 12:10
- - knutinh   I think that the difference between 12 bits and 16...   Feb 27 2008, 15:00
|- - MLXXX   QUOTE (knutinh @ Feb 28 2008, 00:00) I th...   Feb 27 2008, 16:59
- - volvme+   Sorry for interrupting your conversation, but I do...   Feb 27 2008, 19:27
- - MLXXX   AndyH, perhaps you might be kind enough to answer ...   Mar 3 2008, 07:27
- - cabbagerat   QUOTE (MLXXX @ Mar 2 2008, 22:27) Being a...   Mar 3 2008, 10:43
|- - MLXXX   QUOTE (cabbagerat @ Mar 3 2008, 19:43) ~ ...   Mar 3 2008, 13:48
|- - Soap   QUOTE (MLXXX @ Mar 3 2008, 07:48) When I ...   Mar 3 2008, 14:11
|- - MLXXX   Thanks, Soap. I should have been more precise. Wh...   Mar 3 2008, 15:06
- - SebastianG   Hi! I'd like to remind you that there...   Mar 3 2008, 11:02
- - AndyH-ha   I know this isn't the only time I raised the t...   Mar 3 2008, 12:03
- - cabbagerat   QUOTE (SebastianG @ Mar 3 2008, 02:02) I...   Mar 3 2008, 13:25
- - cabbagerat   QUOTE (MLXXX @ Mar 3 2008, 04:48) If I am...   Mar 3 2008, 15:23
|- - MLXXX   QUOTE (cabbagerat @ Mar 4 2008, 00:23) Wi...   Mar 3 2008, 15:35
- - cabbagerat   QUOTE (MLXXX @ Mar 3 2008, 06:35) QUOTE (...   Mar 3 2008, 16:17
|- - MLXXX   QUOTE (cabbagerat @ Mar 4 2008, 01:17) ~ ...   Mar 4 2008, 16:25
- - AndyH-ha   I generally issue this type of challenge when some...   Mar 4 2008, 19:45
- - MLXXX   I've a added a 24-bit 48KHz original, and 16-b...   Mar 10 2008, 16:00
- - Pio2001   Hello, In september, I did an ABX between a 96 kHz...   Nov 26 2008, 22:25
|- - Canar   QUOTE (Pio2001 @ Nov 26 2008, 13:25) Voxe...   Nov 27 2008, 00:27
||- - Dynamic   QUOTE (Canar @ Nov 27 2008, 00:27) QUOTE ...   Nov 27 2008, 05:27
|- - Kees de Visser   QUOTE (Pio2001 @ Nov 26 2008, 22:25) I go...   Nov 27 2008, 10:32
- - Pio2001   Thank you for the precisions about dither. This is...   Nov 27 2008, 19:48
- - Canar   I fully recognize that, and want to thank you agai...   Nov 27 2008, 21:18
- - solive   QUOTE (AndyH-ha @ Nov 2 2006, 18:19)...   Jan 5 2009, 01:28
- - greynol   http://www.hydrogenaudio.org/forums/index....showt...   Jan 5 2009, 01:38
|- - Martin Kantola   Greetings, found your forum recently, so here...   Jan 21 2009, 22:04
|- - Kees de Visser   QUOTE (Martin Kantola @ Jan 21 2009, 22:0...   Jan 22 2009, 07:37
- - 2Bdecided   I can't ABX it. I agree it's a perfectly g...   Jan 22 2009, 13:45
- - AndyH-ha   I m going to see if I can borrow a fast connectio...   Jan 22 2009, 22:12
|- - Martin Kantola   QUOTE (AndyH-ha @ Jan 22 2009, 16:12...   Jan 23 2009, 05:01
|- - Ron Jones   QUOTE (Martin Kantola @ Jan 22 2009, 20:0...   Jan 23 2009, 05:58
||- - Martin Kantola   QUOTE (Ron Jones @ Jan 22 2009, 23:58) As...   Jan 23 2009, 06:23
|- - 2Bdecided   QUOTE (Martin Kantola @ Jan 23 2009, 04:0...   Jan 23 2009, 11:47
|- - Martin Kantola   QUOTE (2Bdecided @ Jan 23 2009, 05:47) I ...   Jan 23 2009, 16:11
- - Axon   18/32 - there's a harshness in the left channe...   Jan 23 2009, 07:56
- - 2Bdecided   Found it... http://www.gearslutz.com/board/so-muc...   Jan 23 2009, 16:30
|- - Martin Kantola   QUOTE (2Bdecided @ Jan 23 2009, 10:30) My...   Jan 23 2009, 18:41
|- - krabapple   QUOTE (2Bdecided @ Jan 23 2009, 10:30) Fo...   Jan 24 2009, 01:01
|- - Martin Kantola   QUOTE (krabapple @ Jan 23 2009, 19:01) Bu...   Jan 24 2009, 03:11
|- - krabapple   QUOTE (Martin Kantola @ Jan 23 2009, 21:1...   Jan 25 2009, 00:08
||- - Martin Kantola   QUOTE (krabapple @ Jan 24 2009, 18:08) An...   Jan 25 2009, 00:28
|- - MLXXX   QUOTE (Martin Kantola @ Jan 24 2009, 12:1...   Jan 27 2009, 10:16
|- - krabapple   QUOTE (MLXXX @ Jan 27 2009, 04:16) The ef...   Jan 27 2009, 18:57
|- - MLXXX   QUOTE (krabapple @ Jan 28 2009, 03:57) Is...   Jan 28 2009, 14:14
- - 2Bdecided   Here you go... http://rapidshare.de/files/4332135...   Jan 23 2009, 17:25
|- - Martin Kantola   QUOTE (2Bdecided @ Jan 23 2009, 11:25) He...   Jan 24 2009, 07:13
- - 2Bdecided   Thank you Martin. Putting noise in the last 8 bit...   Jan 24 2009, 21:09
- - 2Bdecided   Remember those stats are only true for the situati...   Jan 25 2009, 17:38
|- - Martin Kantola   Thanks for the info David, I'm completely new ...   Jan 25 2009, 17:59
- - AndyH-ha   This was asked more than once but there was no res...   Jan 29 2009, 11:05
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