25 Jul
2011
25 Jul
'11
9:39 a.m.
On 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@gnumonks.org http://laforge.gnumonks.org/
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"Privacy in residential applications is a desirable marketing option."
(ETSI EN 300 175-7 Ch. A6)