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Topic: Aac-sbr (Read 4632 times) previous topic - next topic
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Aac-sbr

I know I'm always last to find out everything but  , after reading some of the posting in this forum aac-sbr seems to be the latest thing!

Is aac-sbr the latest version of aac or is something better already out?

Has aac-sbr been stablized yet?

I know its supposed to improve bitrates at 96k and below but does it improve bitsrates at 128k and above?

Whats better aac-sbr or mpc?

Will aac-sbr are low bit rate be playable on portable devices?

Will aac-sbr at 96k sound like aac at 128k?

Aac-sbr

Reply #1 –
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Is aac-sbr the latest version of aac or is something better already out?


It's not a "version". It should be considered as an add-on to the AAC standard. It will be released as MPEG4v3, probably at Q1 2003.

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Has aac-sbr been stablized yet?


Well, I don't know what you mean by stabilized.

It hasn't been standardized by the MPEG yet, but there are already final drafts available. These drafts are being used on FAAD2's SBR support (should be available soon)

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I know its supposed to improve bitrates at 96k and below but does it improve bitsrates at 128k and above?


Slightly. It depends on wether you can live with the SBR sound (some people claim it to sound "dull" and "artificial"), or you prefer 128kbps alone.

Above that, it's probably unnecessary.

Quote
Whats better aac-sbr or mpc?


They are targeted at different situations. AAC+ is for dial-up bitrates and overall low bitrate encoding with good quality (but usually far from transparent). MPC is meant for high bitrates and perfect quality (transparency).

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Will aac-sbr are low bit rate be playable on portable devices?


Who knows?
At the moment, it's not supported anywhere - not even in Faad - except for sattelite radio. (I don't remember the radio name right now)

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Will aac-sbr at 96k sound like aac at 128k?


That's the plan.

Regards;

Roberto.

Aac-sbr

Reply #2 –
thanx for clearing things up.  Just 1 more thing, which format is better for 8cm mp3/cd portable devices?  Is it aac or ogg?

Aac-sbr

Reply #3 –
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thanx for clearing things up.  Just 1 more thing, which format is better for 8cm mp3/cd portable devices?  Is it aac or ogg?

Easy! AAC is better because you can play it. There are no Ogg players (yet). 

Aac-sbr

Reply #4 –
Soon Ogg Vorbis players will infiltrate homes... 
-=MusePack... Living Audio Compression=-

Honda - The Power of Dreams

Aac-sbr

Reply #5 –
If ogg is better then aac, would philips exp431 be a good investment as it allows the software codec to be upgraded to allow users to play future audio format?

Aac-sbr

Reply #6 –
Yes it would, anything made from a reputable company and allows software upgrades would be worthwhile looking into purchasing.
-=MusePack... Living Audio Compression=-

Honda - The Power of Dreams

Aac-sbr

Reply #7 –
Quote
Quote
Will aac-sbr are low bit rate be playable on portable devices?


Who knows?
At the moment, it's not supported anywhere - not even in Faad - except for sattelite radio. (I don't remember the radio name right now)

You probably mean "XM Satellite Radio":

http://www.xmradio.com/

But there's also "Digital Radio Mondiale":

http://www.drm.org

Both already use AAC+ with Spectral Band Replication, because it allows them to split their available overall bandwidth into many channels (XM Radio has 101 right now) with "near-FM quality", as DRM calls it. This company is planning to use the good old AM frequencies for digitally beefed-up radio channels with a much better sound.
ZZee ya, Hans-Jürgen
BLUEZZ BASTARDZZ - "That lil' ol' ZZ Top cover band from Hamburg..."
INDIGO ROCKS - "Down home rockin' blues. Tasty as strudel."

Aac-sbr

Reply #8 –
Quote
Quote
Quote
Will aac-sbr are low bit rate be playable on portable devices?


Who knows?
At the moment, it's not supported anywhere - not even in Faad - except for sattelite radio. (I don't remember the radio name right now)

You probably mean "XM Satellite Radio":

http://www.xmradio.com/

But there's also "Digital Radio Mondiale":

http://www.drm.org

Both already use AAC+ with Spectral Band Replication, because it allows them to split their available overall bandwidth into many channels (XM Radio has 101 right now) with "near-FM quality", as DRM calls it. This company is planning to use the good old AM frequencies for digitally beefed-up radio channels with a much better sound.

If that question was for me, then no.  I meant a portable device like philips exp431.  I am very very interested in that device.  Its small, looks good, used 8cm cds, upgradable audio formats.  The only thing stopping me from buying it is that I am not 100% sure if it supports aac?

Aac-sbr

Reply #9 –
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If that question was for me, then no.

Yes I know, that's why I quoted rjamorim = Roberto... 

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I meant a portable device like philips exp431.  I am very very interested in that device.  Its small, looks good, used 8cm cds, upgradable audio formats.  The only thing stopping me from buying it is that I am not 100% sure if it supports aac?


Why don't you just buy it and try it out? You can always give it back within 90 days from day of purchase, so there's no risk at all, concerning the battery drain issue for example. By the way, the german magazine Stereoplay tested 12 different MP3/CD-players in their September issue, and Philips EXP 301 was one of them. They did not classify it as being flashable (but surely as being able to play AAC), so I'm not sure that your EXP 431 really has that feature. I also couldn't find this feature on the Philips website.
ZZee ya, Hans-Jürgen
BLUEZZ BASTARDZZ - "That lil' ol' ZZ Top cover band from Hamburg..."
INDIGO ROCKS - "Down home rockin' blues. Tasty as strudel."

Aac-sbr

Reply #10 –
It seems that there is a draft of the mpeg4 sbr extension specs on mp3-tech.org

;-)
 

Aac-sbr

Reply #11 –


Coding Technologies demonstrated AAC+ at IBC-2002,  the configuration was:

32 kbps 44.1 kHz stereo - (cut off 16 kHz or more)

Anyway, I did listen to the test material and it sounds very cool for that bit rate.  SBR is definitely a technology of choice for very low bitrate coding (64 kbps and below)