[opus] Questions regarding OPUS_APPLICATION_AUDIO vs OPUS_BANDWIDTH_NARROWBAND
yellowjacketlite at gmail.com
Tue Feb 24 09:44:36 PST 2015
Ooops! I didn't reply-all...
When I look at the opus_defines.h, OPUS_BANDWIDTH_NARROWBAND, is defined as
'< 4 kHz bandpass'. I assume 'bandpass' in this case refers to a 'bandpass
Looking at the briefly looking at the Opus RFC, I __think__ the 'bandpass'
is applied per frame. Which means the 'center' of the bandpass filter
could change frame to frame. Maybe I'm wrong and I need to slapped in the
face with fish, but that's what it looks like it happening.
On Tue, Feb 24, 2015 at 11:59 AM, Jean-Marc Valin <jmvalin at jmvalin.ca>
> Can you explain what you mean by "center point"?
> On 24/02/15 11:30 AM, Tony wrote:
> > I have an audio device whose 'driver' gives me Opus encoded frames
> > using OPUS_APPLICATION_AUDIO and max bandwidth set to
> > OPUS_BANDWIDTH_NARROWBAND. How does Opus encoder decide the center
> > point of the 4K bandpass filter? Is it done frame by frame?
> > --
> > Tony
> > _______________________________________________
> > opus mailing list
> > opus at xiph.org
> > http://lists.xiph.org/mailman/listinfo/opus
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