sigcvt.cpp

一个语音信号端点检测的程序

//
// SIGCONVERT.CC - convert a-law and mu-law to linear
//
// Bruce T. Lowerre, Public domain, 1995, 1997
//
// $Log: sigcvt.cc,v $
// Revision 1.1  1997/05/13 14:56:50  lowerre
// Initial revision
//
//
//

/*
 * This is a library module which is used to convert 8 bit mu-law and
 * 8 bit a-law samples to 16 bit linear.  The conversions are done by indexing
 * into a 256 entry table.
 */


#include "sigcvt.h"


short sigconvert::mulawtable[256] =
{
    -32124, -31100, -30076, -29052, -28028,
    -27004, -25980, -24956, -23932, -22908,
    -21884, -20860, -19836, -18812, -17788,
    -16764, -15996, -15484, -14972, -14460,
    -13948, -13436, -12924, -12412, -11900,
    -11388, -10876, -10364,  -9852,  -9340,
     -8828,  -8316,  -7932,  -7676,  -7420,
     -7164,  -6908,  -6652,  -6396,  -6140,
     -5884,  -5628,  -5372,  -5116,  -4860,
     -4604,  -4348,  -4092,  -3900,  -3772,
     -3644,  -3516,  -3388,  -3260,  -3132,
     -3004,  -2876,  -2748,  -2620,  -2492,
     -2364,  -2236,  -2108,  -1980,  -1884,
     -1820,  -1756,  -1692,  -1628,  -1564,
     -1500,  -1436,  -1372,  -1308,  -1244,
     -1180,  -1116,  -1052,   -988,   -924,
      -876,   -844,   -812,   -780,   -748,
      -716,   -684,   -652,   -620,   -588,
      -556,   -524,   -492,   -460,   -428,
      -396,   -372,   -356,   -340,   -324,
      -308,   -292,   -276,   -260,   -244,
      -228,   -212,   -196,   -180,   -164,
      -148,   -132,   -120,   -112,   -104,
       -96,    -88,    -80,    -72,    -64,
       -56,    -48,    -40,    -32,    -24,
       -16,     -8,      0,  32124,  31100,
     30076,  29052,  28028,  27004,  25980,
     24956,  23932,  22908,  21884,  20860,
     19836,  18812,  17788,  16764,  15996,
     15484,  14972,  14460,  13948,  13436,
     12924,  12412,  11900,  11388,  10876,
     10364,   9852,   9340,   8828,   8316,
      7932,   7676,   7420,   7164,   6908,
      6652,   6396,   6140,   5884,   5628,
      5372,   5116,   4860,   4604,   4348,
      4092,   3900,   3772,   3644,   3516,
      3388,   3260,   3132,   3004,   2876,
      2748,   2620,   2492,   2364,   2236,
      2108,   1980,   1884,   1820,   1756,
      1692,   1628,   1564,   1500,   1436,
      1372,   1308,   1244,   1180,   1116,
      1052,    988,    924,    876,    844,
       812,    780,    748,    716,    684,
       652,    620,    588,    556,    524,
       492,    460,    428,    396,    372,
       356,    340,    324,    308,    292,
       276,    260,    244,    228,    212,
       196,    180,    164,    148,    132,
       120,    112,    104,     96,     88,
        80,     72,     64,     56,     48,
        40,     32,     24,     16,      8,
         0
};


short sigconvert::alawtable[256] =
{
      -5504,   -5248,   -6016,   -5760,   -4480,
      -4224,   -4992,   -4736,   -7552,   -7296,
      -8064,   -7808,   -6528,   -6272,   -7040,
      -6784,   -2752,   -2624,   -3008,   -2880,
      -2240,   -2112,   -2496,   -2368,   -3776,
      -3648,   -4032,   -3904,   -3264,   -3136,
      -3520,   -3392,  -22016,  -20992,  -24064,
     -23040,  -17920,  -16896,  -19968,  -18944,
     -30208,  -29184,  -32256,  -31232,  -26112,
     -25088,  -28160,  -27136,  -11008,  -10496,
     -12032,  -11520,   -8960,   -8448,   -9984,
      -9472,  -15104,  -14592,  -16128,  -15616,
     -13056,  -12544,  -14080,  -13568,    -344,
       -328,    -376,    -360,    -280,    -264,
       -312,    -296,    -472,    -456,    -504,
       -488,    -408,    -392,    -440,    -424,
        -88,     -72,    -120,    -104,     -24,
         -8,     -56,     -40,    -216,    -200,
       -248,    -232,    -152,    -136,    -184,
       -168,   -1376,   -1312,   -1504,   -1440,
      -1120,   -1056,   -1248,   -1184,   -1888,
      -1824,   -2016,   -1952,   -1632,   -1568,
      -1760,   -1696,    -688,    -656,    -752,
       -720,    -560,    -528,    -624,    -592,
       -944,    -912,   -1008,    -976,    -816,
       -784,    -880,    -848,    5504,    5248,
       6016,    5760,    4480,    4224,    4992,
       4736,    7552,    7296,    8064,    7808,
       6528,    6272,    7040,    6784,    2752,
       2624,    3008,    2880,    2240,    2112,
       2496,    2368,    3776,    3648,    4032,
       3904,    3264,    3136,    3520,    3392,
      22016,   20992,   24064,   23040,   17920,
      16896,   19968,   18944,   30208,   29184,
      32256,   31232,   26112,   25088,   28160,
      27136,   11008,   10496,   12032,   11520,
       8960,    8448,    9984,    9472,   15104,
      14592,   16128,   15616,   13056,   12544,
      14080,   13568,     344,     328,     376,
        360,     280,     264,     312,     296,
        472,     456,     504,     488,     408,
        392,     440,     424,      88,      72,
        120,     104,      24,       8,      56,
         40,     216,     200,     248,     232,
        152,     136,     184,     168,    1376,
       1312,    1504,    1440,    1120,    1056,
       1248,    1184,    1888,    1824,    2016,
       1952,    1632,    1568,    1760,    1696,
        688,     656,     752,     720,     560,
        528,     624,     592,     944,     912,
       1008,     976,     816,     784,     880,
        848
};

// end of sigconvert.cc