FreeCalypso > hg > gsm-codec-lib
view libtwamr/c4_17pf.h @ 429:3ce30a95769e
libtwamr: implement test sequence input
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 07 May 2024 22:34:11 +0000 |
parents | fc82b113977f |
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 : c4_17pf.h * Purpose : Searches a 17 bit algebraic codebook containing 4 pulses * in a frame of 40 samples. * ******************************************************************************** */ #ifndef c4_17pf_h #define c4_17pf_h "$Id $" /* ******************************************************************************** * INCLUDE FILES ******************************************************************************** */ #include "typedef.h" /* ******************************************************************************** * LOCAL VARIABLES AND TABLES ******************************************************************************** */ /* ******************************************************************************** * DEFINITION OF DATA TYPES ******************************************************************************** */ /* ******************************************************************************** * DECLARATION OF PROTOTYPES ******************************************************************************** */ /************************************************************************* * * FUNCTION: code_4i40_17bits() * * PURPOSE: Searches a 17 bit algebraic codebook containing 4 pulses * in a frame of 40 samples. * * DESCRIPTION: * The code length is 40, containing 4 nonzero pulses: i0...i3. * All pulses can have two possible amplitudes: +1 or -1. * Pulse i0 to i2 can have 8 possible positions, pulse i3 can have * 2x8=16 positions. * * i0 : 0, 5, 10, 15, 20, 25, 30, 35. * i1 : 1, 6, 11, 16, 21, 26, 31, 36. * i2 : 2, 7, 12, 17, 22, 27, 32, 37. * i3 : 3, 8, 13, 18, 23, 28, 33, 38. * 4, 9, 14, 19, 24, 29, 34, 39. * *************************************************************************/ Word16 code_4i40_17bits( 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 4 pulses */ ); #endif