FreeCalypso > hg > gsm-codec-lib
view libtwamr/c3_14pf.h @ 457:9bcf65088006
doc/AMR-EFR-philosophy: document implemented solution
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 10 May 2024 18:20:06 +0000 |
parents | 5fc9a2d12048 |
children |
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/* ******************************************************************************** * * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001 * R99 Version 3.3.0 * REL-4 Version 4.1.0 * ******************************************************************************** * * File : c3_14pf.h * Purpose : Searches a 14 bit algebraic codebook containing 3 pulses * in a frame of 40 samples. * ******************************************************************************** */ #ifndef c3_14pf_h #define c3_14pf_h "$Id $" /* ******************************************************************************** * INCLUDE FILES ******************************************************************************** */ #include "typedef.h" /* ******************************************************************************** * LOCAL VARIABLES AND TABLES ******************************************************************************** */ /* ******************************************************************************** * DEFINITION OF DATA TYPES ******************************************************************************** */ /* ******************************************************************************** * DECLARATION OF PROTOTYPES ******************************************************************************** */ /************************************************************************* * * FUNCTION: code_3i40_14bits() * * PURPOSE: Searches a 14 bit algebraic codebook containing 3 pulses * in a frame of 40 samples. * * DESCRIPTION: * The code length is 40, containing 3 nonzero pulses: i0...i2. * All pulses can have two possible amplitudes: +1 or -1. * Pulse i0 can have 8 possible positions, pulses i1 and i2 can have * 2x8=16 positions. * * i0 : 0, 5, 10, 15, 20, 25, 30, 35. * i1 : 1, 6, 11, 16, 21, 26, 31, 36. * 3, 8, 13, 18, 23, 28, 33, 38. * i2 : 2, 7, 12, 17, 22, 27, 32, 37. * 4, 9, 14, 19, 24, 29, 34, 39. * *************************************************************************/ Word16 code_3i40_14bits( Word16 x[], /* (i) : target vector */ Word16 h[], /* (i) : impulse response of weighted synthesis filter */ /* h[-L_subfr..-1] must be set to zero. */ Word16 T0, /* (i) : Pitch lag */ Word16 pitch_sharp, /* (i) : Last quantized pitch gain */ Word16 code[], /* (o) : Innovative codebook */ Word16 y[], /* (o) : filtered fixed codebook excitation */ Word16 * sign /* (o) : Signs of 3 pulses */ ); #endif