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New Standard: USAC, sussesor of (HE)-AAC
IgorC
post Sep 16 2011, 06:09
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It's a new standard (Unified Speech and Audio Coding USAC, aka MPEG-D part 3).
It has reached a status of Final Draft International Standard.

Basic information http://en.wikipedia.org/wiki/Unified_Speech_and_Audio_Coding
There are some papers about new compression schemes in internet.

There was a verification test where USAC was compared to HE-AAC v1/v2 on range of bitrates 8-96 kbps. http://mpeg.chiariglione.org/meetings/tori...orino_press.htm
The report should be available in September October.

Some anonymous source has indicated that USAC was clearly superior to HE-AAC and it did very good on speech though something like "USAC at 48 kpbs = HE-AAC at 64 kbps" shouldn't be expected. It's more like 20-25% of bitrate gain at 20-32 kbps and 10-12% at 64 kbps. That's still pretty good.

There is no information if USAC will be used at higher bitrates as ( LC-AAC's area). The core coder of USAC includes a new enhanced SBR (eSBR).
Both SBR and new eSBR have no advantage over LC-AAC at bitrates higher than 80 kbps. Its unclear if eSBR can be disabled at higher bitrates.


It will be interesting to hear opinions and if somebody knows something more about it.
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FreaqyFrequency
post Oct 13 2011, 01:53
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Cool stuff! Always exciting to see the prospects of where better coding will be able to take us, especially low-bitrate streaming. If we are able to achieve perceptual transparency in bitrates under 50kbps within the next five years, that would be pretty amazing. smile.gif


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Speckmade
post Jul 12 2012, 18:52
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QUOTE (FreaqyFrequency @ Oct 13 2011, 02:53) *
If we are able to achieve perceptual transparency in bitrates under 50kbps within the next five years, that would be pretty amazing. smile.gif

Given that I think I remember figures of about 64 kbps for the amount of data that the brain receives from your ears that would truely be something.
On top of that you can use those new general purpose data compression tools, that can compress input regardless of content by ~30 % - and because their effect is given independent from the contents you can recursively feed their output back into them and compress every piece of audio down to 1 bit. - Amazeing!
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Canar
post Jul 12 2012, 19:00
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QUOTE (Speckmade @ Jul 12 2012, 10:52) *
On top of that you can use those new general purpose data compression tools, that can compress input regardless of content by ~30 % - and because their effect is given independent from the contents you can recursively feed their output back into them and compress every piece of audio down to 1 bit. - Amazeing!
You're funny.


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Posts in this topic
- IgorC   New Standard: USAC   Sep 16 2011, 06:09
- - IgorC   USAC verification test report   Oct 12 2011, 19:57
- - C.R.Helmrich   Thanks for posting that link, Igor! I've a...   Oct 12 2011, 21:49
|- - IgorC   QUOTE (C.R.Helmrich @ Oct 12 2011, 17:49)...   Oct 13 2011, 02:53
- - FreaqyFrequency   Cool stuff! Always exciting to see the prospe...   Oct 13 2011, 01:53
|- - Speckmade   QUOTE (FreaqyFrequency @ Oct 13 2011, 02...   Jul 12 2012, 18:52
|- - Canar   QUOTE (Speckmade @ Jul 12 2012, 10:52) On...   Jul 12 2012, 19:00
- - polemon   For me, as a Linux user, developer of embedded sys...   Oct 13 2011, 15:34
|- - C.R.Helmrich   QUOTE (polemon @ Oct 13 2011, 16:34) I re...   Oct 13 2011, 20:40
|- - polemon   QUOTE (C.R.Helmrich) Well, (HE-)AAC is used in DAB...   Oct 13 2011, 22:23
||- - C.R.Helmrich   QUOTE (polemon @ Oct 13 2011, 23:23) The ...   Oct 14 2011, 20:35
||- - Garf   QUOTE (C.R.Helmrich @ Oct 14 2011, 21:35)...   Oct 15 2011, 15:15
|- - Garf   QUOTE (C.R.Helmrich @ Oct 13 2011, 21:40)...   Oct 14 2011, 07:04
|- - Speckmade   QUOTE (C.R.Helmrich @ Oct 13 2011, 21:40)...   Jul 12 2012, 21:11
|- - Garf   QUOTE (Speckmade @ Jul 12 2012, 22:11) Be...   Jul 12 2012, 22:16
- - FreaqyFrequency   @polemon, you're familiar with Opus, I assume?...   Oct 13 2011, 16:00
|- - polemon   Well, I don't want to be an evangelist of any ...   Oct 13 2011, 18:32
|- - IgorC   QUOTE (FreaqyFrequency @ Oct 13 2011, 12...   Oct 13 2011, 22:35
- - smok3   polemon, interesting, but if you wanna do it ...   Oct 13 2011, 19:35
- - hlloyge   Problem with Linux isn't finding encoders for ...   Oct 13 2011, 20:58
|- - C.R.Helmrich   Well, USAC is just that: a general purpose codec. ...   Oct 13 2011, 21:25
- - IgorC   Nice, It will be great to see an implementation ...   Oct 13 2011, 21:30
|- - ksuman   QUOTE (IgorC @ Oct 13 2011, 21:30) Nice, ...   May 16 2012, 06:26
- - smok3   QUOTE your Linux distributor of choice licenses a ...   Oct 14 2011, 20:51
|- - Garf   QUOTE (smok3 @ Oct 14 2011, 21:51) - to p...   Oct 15 2011, 15:22
- - smok3   i meant paying (or just allowing closed binaries) ...   Oct 15 2011, 19:58
- - IgorC   Reference software http://www.itscj.ipsj.or.jp/sc2...   Jun 3 2012, 17:55
|- - Garf   QUOTE (IgorC @ Jun 3 2012, 18:55) Referen...   Aug 3 2012, 16:07
|- - C.R.Helmrich   QUOTE (Garf @ Aug 3 2012, 17:07) In true ...   Aug 3 2012, 16:36
|- - Garf   QUOTE (C.R.Helmrich @ Aug 3 2012, 17:36) ...   Aug 3 2012, 17:04
|- - IgorC   QUOTE (C.R.Helmrich @ Aug 3 2012, 12:36) ...   Aug 3 2012, 17:30
- - pdq   I think you will find that no matter how many time...   Jul 12 2012, 19:13
- - benski   One thing that's curious about USAC. Much of ...   Jul 12 2012, 20:29
- - IgorC   Maybe it's this particular encoder. Because ...   Aug 3 2012, 17:02
|- - C.R.Helmrich   QUOTE (IgorC @ Aug 3 2012, 18:02) Because...   Aug 3 2012, 20:08
- - darkbyte   Is there any encoder/decoder available in binary f...   Oct 17 2013, 22:02


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