Speex dev - Mar 2006 - Same bitrates on narrowband for quality 3/4, 5/6, 7/8?

Hi all,

When encoding narrowband with speexenc I notice the bitrate is the same for
qualities 3 / 4, 5 / 6, and 7 / 8 (8000, 11000, and 15000 respectively).  I
didn't test this on prior versions of the encoder so I'm not sure if
this is
something new, but am curious if there is a difference between the above
respective settings (does quality 4 yield better results on narrowband than
quality 3 despite being the same bitrate?  Or are they defaulting to the
same rate?)

Thanks,
Sol Young

Hi,

Quality settings 3/4, 5/6 and 7/8 are *exactly* the same as they map to
the same mode internally. The reason for that is simply that a 0-10
scale for quality is convenient, but for narrowband (unlike wideband),
there are only 8 modes available, so some must be repeated.

	Jean-Marc

Le lundi 27 mars 2006 ? 14:55 -0500, Sol Young a ?crit :
> Hi all,
> 
> When encoding narrowband with speexenc I notice the bitrate is the same for
> qualities 3 / 4, 5 / 6, and 7 / 8 (8000, 11000, and 15000 respectively).  I
> didn't test this on prior versions of the encoder so I'm not sure
if this is
> something new, but am curious if there is a difference between the above
> respective settings (does quality 4 yield better results on narrowband than
> quality 3 despite being the same bitrate?  Or are they defaulting to the
> same rate?)
> 
> Thanks,
> Sol Young
> 
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