[opus] Version 1.1-alpha is out

Jean-Marc Valin jmvalin at jmvalin.ca
Fri Dec 21 22:56:59 PST 2012

On 12/22/2012 12:59 AM, Ross Bencina wrote:
> That's great news. I notice that you mention that the transient detector 
> has been rewritten. Out of curiousity, I'm wondering what algorithm you 
> are employing here? has anything been published on the technique you're 
> using?

It's an algo I "invented", but I wouldn't dare say that I'm the first to
invent it. It's based on a trivial temporal masking model and assumes
flat quantization noise. From there, it computes the average
noise-to-mask ratio that's compared to a threshold to make the decision.
I'm planning on publishing a document describing the technical details
of the new algorithms. Probably with the final 1.1 release.


> Thanks,
> Ross
> On 22/12/2012 3:50 PM, Jean-Marc Valin wrote:
>> We just released Opus 1.1-alpha, which includes more than one year of
>> development compared to the 1.0.x branch. There are quality
>> improvements, optimizations, bug fixes, as well as an experimental
>> speech/music detector for mode decisions.
>> You can read more about it in this blog post:
>> http://jmspeex.livejournal.com/11737.html
>> As usual, the code can be downloaded from:
>> http://opus-codec.org/downloads/
>> Please report any problems you have with this alpha, either on the
>> mailing list or by joining the #opus channel on irc.freenode.net.
>> Cheers,
>> 	Jean-Marc
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