Skip to main content ↑ ↓

Notice

Please note that most of the software linked on this forum is likely to be safe to use. If you are unsure, feel free to ask in the relevant topics, or send a private message to an administrator or moderator. To help curb the problems of false positives, or in the event that you do find actual malware, you can contribute through the article linked here.
Topic: aptX Lossless (Read 4582 times) previous topic - next topic
0 Members and 1 Guest are viewing this topic.

aptX Lossless

This is about aptX Lossless, a lossless audio codec that is not related to the "well-known" aptX codec (lossy subband ADPCM; used in Bluetooth A2DP for instance; discussed [a href='index.php?showtopic=78217']here[/a] and [a href='index.php?showtopic=104654']here[/a]).

CSR, owner of the technology since 2010, has an overview / marketing page for the aptX "suite of algorithms". There is also a whitepaper pdf that contains mostly high-level information - not much but the best I could find.

Does anybody know any further details about aptX Lossless?
How does it achieve low latency (short frames?!) and good compression? (better than FLAC, according to the whitepaper linked above)

Which software applications or hardware devices use aptX Lossless?
Are there any independent test results available?
 

aptX Lossless

Reply #1 –
I am not certain of any of the claims but from what I read...

The spec mentions two modes of lossless. The "hybrid lossless" or near lossless coding (as it says) is for bandwidth restrictions apparently during encoding. I could imagine the scalable coding latency is likely part of the hybrid element unless the CPU has a lot more horsepower. Even so, there might be more to it than merely a FLAC rip-off with some extra functions.

edit: What I read doesn't differ much from the whitepaper. There's does not appear to be a whole lot of real lossless going on.
"Something bothering you, Mister Spock?"