FreeCalypso > hg > gsm-codec-lib
view libgsmefr/lag_wind.tab @ 605:63f774192906
gsmhr_decoder_twts002_in(): set BFI=1 SID=1 for invalid SID
When a received TW-TS-002 RTP payload indicates invalid SID,
which of the 3 possible BFI/SID combinations should we pass to
our internal ETSI-based speech decoder or TFO engine?
Our original code passed BFI=0 SID=1, but upon further reflection,
BFI=1 SID=1 is a better choice. In the corner case where received
invalid SID is fed to a full decoder in homed state, setting BFI=1
allows that decoder to emit zeros on PCM and stay homed, instead of
launching into full decoding.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Thu, 04 Dec 2025 21:01:46 +0000 |
| parents | 37e39cad5838 |
| children |
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/*-----------------------------------------------------* | Table of lag_window for autocorrelation. | | noise floor = 1.0001 = (0.9999 on r[1] ..r[10]) | | Bandwitdh expansion = 60 Hz | | | | | | lag_wind[0] = 1.00000000 (not stored) | | lag_wind[1] = 0.99879038 | | lag_wind[2] = 0.99546897 | | lag_wind[3] = 0.98995781 | | lag_wind[4] = 0.98229337 | | lag_wind[5] = 0.97252619 | | lag_wind[6] = 0.96072036 | | lag_wind[7] = 0.94695264 | | lag_wind[8] = 0.93131179 | | lag_wind[9] = 0.91389757 | | lag_wind[10]= 0.89481968 | -----------------------------------------------------*/ static const Word16 lag_h[10] = { 32728, 32619, 32438, 32187, 31867, 31480, 31029, 30517, 29946, 29321 }; static const Word16 lag_l[10] = { 11904, 17280, 30720, 25856, 24192, 28992, 24384, 7360, 19520, 14784 };
