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Sansa e200 v1: HE-AAC/AAC+ playback

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vinnie97:
A year later, I see the progress for this codec on this hardware is still not realtime and that the effort to make it happen is probably not worth it, especially since the equally as impressive WMAPro runs efficiently now.

saratoga:
I don't think WMA Pro really has much to do with AAC-He since they do fairly different things, but improving all codecs is worthwhile anyway. 

vinnie97:
Well, their performance at bitrates below 100kbps is where they shine the brightest.  In all double-blind listening tests I've seen conducted, these 2 codecs along with Vorbis have consistently performed the most impressively...and I realize the technical manner in which they achieve this transparency determines key factors like decoding power requirements.

I meant it's likely not worth it in the sense of someone waiting to use HE-AAC on this hardware, unless they can and are willing to optimize it themselves.

saratoga:

--- Quote from: vinnie97 on March 19, 2011, 05:30:59 PM ---Well, their performance at bitrates below 100kbps is where they shine the brightest.  In all double-blind listening tests I've seen conducted, these 2 codecs along with Vorbis have consistently performed the most impressively...and I realize the technical manner in which they achieve this transparency determines key factors like decoding power requirements.

--- End quote ---

WMA Pro is a normal high bitrate codec like Vorbis, AAC, WMA, or MP3.  AAC-He is a specialized codec that only works at very low bitrates.  I meant that its very weird to compare them since they're usually used for different things.

vinnie97:
Well, anything below 64kbps and I am generally bothered by the artifacts even for mobile listening. ;)  However, independent testing has shown WMA Pro to be highly competitive in the 48-64kbps range at the very least:


multiformat 48 kbps ABX test


multiformat 64 kbps ABX test

This trio of formats seems to be the most well suited to this range, and it's hard to go wrong with any of the above.  Given the additional tuning HE-AAC and Vorbis (at least) have received since the tests (2006-7), this may not be as representative of the reality today.  

This is why I compare them, as they have similar psychoacoustic performance at a bitrate range that interests me in the personal/portable audio arena. :)

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