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annotate libgsmefr/vad.h @ 604:54f0f1b74c25

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libgsmhr1 TFO: require BFI=0 and SID=0 for homing In order for a received frame to be recognized as DHF, we need not only the correct bit pattern, but also BFI=0 and SID=0. The BFI=0 requirement should be obvious, while the SID=0 requirement is needed only for HR codec. With FR and EFR, SID classification comes from the payload bits and no separate check is needed - but in HR we get an out-of-band SID ternary flag. When SID=1, no payload bits are used at all; when SID=2, we use only the first 33 bits of the payload. Therefore, it is proper to conditionalize DHF acceptance on SID=0. We already implemented this logic in the just finished full decoder; now bring TFO code into agreement.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 19:40:35 +0000
parents 756605c4850f
children
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1 /***************************************************************************
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2 *
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3 * File Name: vad.h
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4 *
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5 * Purpose: Contains the prototypes for all functions of voice activity
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6 * detection. Also contains the type definition for the pseudo
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7 * floating point data type.
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8 *
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9 **************************************************************************/
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11 void vad_reset (struct EFR_encoder_state *st);
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13 Word16 vad_computation (
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14 struct EFR_encoder_state *st,
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15 Word16 r_h[],
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16 Word16 r_l[],
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17 Word16 scal_acf,
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18 Word16 rc[],
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19 Word16 ptch
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20 );
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22 void periodicity_update (
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23 struct EFR_encoder_state *st,
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24 Word16 lags[]
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25 );