This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/tetra@lists.osmocom.org/.
Harald Welte laforge at gnumonks.orgOn Sun, Jul 24, 2011 at 01:02:40PM +0100, Graham Palmer wrote:
> I too was wondering how the u-plane data was passed to the codec.
> 300-395-2 states that acelp-codec requires 2 * (137+1) 16bit samples per frame
> and not 216 + 216 bits indicated in the tch reordering file comments.
This is the input to the codec, i.e the PCM audio data.
the 216 + 216 bits are the encoded data, i.e. the codec output (which is
the decoder input).
The re-ordering code in osmo-tetra is untested. You can feed the raw
burst bits into the ETSI reference codec, as it includes the error
correction / viterbi decoder.
--
- Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/
============================================================================
"Privacy in residential applications is a desirable marketing option."
(ETSI EN 300 175-7 Ch. A6)