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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 : c2_9pf.h
- * Purpose : Searches a 9 bit algebraic codebook containing
- * 2 pulses in a frame of 40 samples.
- *
- *****************************************************************************
- */
- #ifndef c2_9pf_h
- #define c2_9pf_h "$Id $"
-
- /*
- *****************************************************************************
- * INCLUDE FILES
- *****************************************************************************
- */
- #include "typedef.h"
- /*
- *****************************************************************************
- * LOCAL VARIABLES AND TABLES
- *****************************************************************************
- */
- /*
- *****************************************************************************
- * DEFINITION OF DATA TYPES
- *****************************************************************************
- */
- /*
- *****************************************************************************
- * DECLARATION OF PROTOTYPES
- *****************************************************************************
- */
- /*************************************************************************
- *
- * FUNCTION: code_2i40_9bits()
- *
- * PURPOSE: Searches a 9 bit algebraic codebook containing 2 pulses
- * in a frame of 40 samples.
- *
- * DESCRIPTION:
- * The code length is 40, containing 2 nonzero pulses: i0...i1.
- * All pulses can have two possible amplitudes: +1 or -1.
- * Pulse i0 can have 8 possible positions, pulse i1 can have
- * 8 positions. Also coded is which track pair should be used,
- * i.e. first or second pair. Where each pair contains 2 tracks.
- *
- * First subframe:
- * first i0 : 0, 5, 10, 15, 20, 25, 30, 35.
- * i1 : 2, 7, 12, 17, 22, 27, 32, 37.
- * second i0 : 1, 6, 11, 16, 21, 26, 31, 36.
- * i1 : 3, 8, 13, 18, 23, 28, 33, 38.
- *
- * Second subframe:
- * first i0 : 0, 5, 10, 15, 20, 25, 30, 35.
- * i1 : 3, 8, 13, 18, 23, 28, 33, 38.
- * second i0 : 2, 7, 12, 17, 22, 27, 32, 37.
- * i1 : 4, 9, 14, 19, 24, 29, 34, 39.
- *
- * Third subframe:
- * first i0 : 0, 5, 10, 15, 20, 25, 30, 35.
- * i1 : 2, 7, 12, 17, 22, 27, 32, 37.
- * second i0 : 1, 6, 11, 16, 21, 26, 31, 36.
- * i1 : 4, 9, 14, 19, 24, 29, 34, 39.
- *
- * Fourth subframe:
- * first i0 : 0, 5, 10, 15, 20, 25, 30, 35.
- * i1 : 3, 8, 13, 18, 23, 28, 33, 38.
- * second i0 : 1, 6, 11, 16, 21, 26, 31, 36.
- * i1 : 4, 9, 14, 19, 24, 29, 34, 39.
- *
- *************************************************************************/
- Word16 code_2i40_9bits(
- Word16 subNr, /* i : subframe number */
- 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 2 pulses */
- );
- #endif
|
