grid.tab

来自「这是一个pcm转amr的源代码」· TAB 代码 · 共 56 行

/*
********************************************************************************
*
*      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             : pow2.c
*      Purpose          : Table for az_lsf()
*      $Id $
*
********************************************************************************
*/
/*-------------------------------------------------------------*
 *  Table for az_lsf()                                         *
 *                                                             *
 * grid[0] = 1.0;                                              *
 * grid[grid_points+1] = -1.0;                                 *
 * for (i = 1; i < grid_points; i++)                           *
 *   grid[i] = cos((6.283185307*i)/(2.0*grid_points));         *
 *                                                             *
 *-------------------------------------------------------------*/

#define grid_points 60

static const short grid[grid_points + 1] =
{
    32760, 32723, 32588, 32364, 32051, 31651,
    31164, 30591, 29935, 29196, 28377, 27481,
    26509, 25465, 24351, 23170, 21926, 20621,
    19260, 17846, 16384, 14876, 13327, 11743,
    10125, 8480, 6812, 5126, 3425, 1714,
    0, -1714, -3425, -5126, -6812, -8480,
    -10125, -11743, -13327, -14876, -16384, -17846,
    -19260, -20621, -21926, -23170, -24351, -25465,
    -26509, -27481, -28377, -29196, -29935, -30591,
    -31164, -31651, -32051, -32364, -32588, -32723,
    -32760
};

static const float grid_f[grid_points + 1] =
{
    32760.0f/32768, 32723.0f/32768, 32588.0f/32768, 32364.0f/32768, 32051.0f/32768, 31651.0f/32768,
    31164.0f/32768, 30591.0f/32768, 29935.0f/32768, 29196.0f/32768, 28377.0f/32768, 27481.0f/32768,
    26509.0f/32768, 25465.0f/32768, 24351.0f/32768, 23170.0f/32768, 21926.0f/32768, 20621.0f/32768,
    19260.0f/32768, 17846.0f/32768, 16384.0f/32768, 14876.0f/32768, 13327.0f/32768, 11743.0f/32768,
    10125.0f/32768, 8480.0f/32768, 6812.0f/32768, 5126.0f/32768, 3425.0f/32768, 1714.0f/32768,
    0.0f/32768, -1714.0f/32768, -3425.0f/32768, -5126.0f/32768, -6812.0f/32768, -8480.0f/32768,
    -10125.0f/32768, -11743.0f/32768, -13327.0f/32768, -14876.0f/32768, -16384.0f/32768, -17846.0f/32768,
    -19260.0f/32768, -20621.0f/32768, -21926.0f/32768, -23170.0f/32768, -24351.0f/32768, -25465.0f/32768,
    -26509.0f/32768, -27481.0f/32768, -28377.0f/32768, -29196.0f/32768, -29935.0f/32768, -30591.0f/32768,
    -31164.0f/32768, -31651.0f/32768, -32051.0f/32768, -32364.0f/32768, -32588.0f/32768, -32723.0f/32768,
    -32760/32768
};