filt0181.h

EP931X系列的WinCE声卡驱动源代码

//****************************************************************************
//
// FILT0181.H - Polyphase sample rate conversion filter with a ratio of
//              ~0.1814.
//
// Copyright (c) 1999,2001 Cirrus Logic, Inc.
//
//****************************************************************************
static const struct
{
    short sNumPolyPhases;
    short sSampleIncrement;
    short sNumTaps;
    short sUnused;
    short sCoefs[23][13];
} SRCFilter_0_1814 =
{
    23,
    127,
    13,
    0,
    {
        {    -1,   -49,   285,  -866,  2178, -5229, 19196,
          17537, -5031,  2111,  -843,   281,   -50 },
        {    -1,   -47,   285,  -874,  2206, -5337, 20787,
          15829, -4754,  2009,  -806,   271,   -49 },
        {    -2,   -44,   279,  -864,  2191, -5345, 22291,
          14091, -4409,  1877,  -757,   258,   -48 },
        {    -3,   -39,   266,  -835,  2131, -5246, 23691,
          12344, -4007,  1719,  -698,   241,   -46 },
        {    -4,   -33,   246,  -787,  2022, -5030, 24970,
          10604, -3560,  1540,  -630,   222,   -43 },
        {    -6,   -24,   220,  -719,  1864, -4691, 26112,
           8891, -3080,  1345,  -557,   201,   -40 },
        {    -7,   -14,   185,  -630,  1656, -4225, 27103,
           7223, -2577,  1140,  -479,   179,   -37 },
        {    -9,    -1,   144,  -520,  1398, -3629, 27931,
           5615, -2063,   928,  -399,   156,   -33 },
        {   -11,    13,    95,  -390,  1092, -2901, 28587,
           4082, -1548,   715,  -319,   132,   -30 },
        {   -14,    29,    40,  -242,   740, -2041, 29061,
           2638, -1041,   504,  -240,   110,   -26 },
        {   -17,    47,   -22,   -76,   345, -1052, 29347,
           1294,  -551,   300,  -163,    87,   -23 },
        {   -20,    66,   -90,   106,   -87,    62, 29443,
             62,   -87,   106,   -90,    66,   -20 },
        {   -23,    87,  -163,   300,  -551,  1294, 29347,
          -1052,   345,   -76,   -22,    47,   -17 },
        {   -26,   110,  -240,   504, -1041,  2638, 29061,
          -2041,   740,  -242,    40,    29,   -14 },
        {   -30,   132,  -319,   715, -1548,  4082, 28587,
          -2901,  1092,  -390,    95,    13,   -11 },
        {   -33,   156,  -399,   928, -2063,  5615, 27931,
          -3629,  1398,  -520,   144,    -1,    -9 },
        {   -37,   179,  -479,  1140, -2577,  7223, 27103,
          -4225,  1656,  -630,   185,   -14,    -7 },
        {   -40,   201,  -557,  1345, -3080,  8891, 26112,
          -4691,  1864,  -719,   220,   -24,    -6 },
        {   -43,   222,  -630,  1540, -3560, 10604, 24970,
          -5030,  2022,  -787,   246,   -33,    -4 },
        {   -46,   241,  -698,  1719, -4007, 12344, 23691,
          -5246,  2131,  -835,   266,   -39,    -3 },
        {   -48,   258,  -757,  1877, -4409, 14091, 22291,
          -5345,  2191,  -864,   279,   -44,    -2 },
        {   -49,   271,  -806,  2009, -4754, 15829, 20787,
          -5337,  2206,  -874,   285,   -47,    -1 },
        {   -50,   281,  -843,  2111, -5031, 17537, 19196,
          -5229,  2178,  -866,   285,   -49,    -1 }
    }
};