51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
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/*
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* sound.cpp
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*
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* Created on: 03 ÿíâ. 2016 ã.
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* Author: Sergey
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*/
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#include "sound.h"
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/*//16-bit sine table (0..Pi/2)
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const int16_t sine_tab[64] = {
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0, 804, 1607, 2410, 3211, 4011, 4807, 5601, 6392, 7179,
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7961, 8739, 9511, 10278,11039,11792,12539,13278,14009,14732,
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15446,16151,16845,17530,18204,18867,19519,20159,20787,21402,
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22005,22594,23170,23731,24279,24811,25329,25832,26319,26790,
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27245,27683,28105,28510,28898,29268,29621,29956,30273,30571,
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30852,31113,31356,31580,31785,31971,32137,32285,32412,32521,
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32609,32678,32728,32757
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};
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*/
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/*int16_t get_sine(uint8_t phase8){
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auto result = (phase8 & 0x40) ? sine_tab[63 - (phase8 & 0x3F)] : sine_tab[phase8 & 0x3F];
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if (phase8 & 0x80) result = -result;
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return result;
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}*/
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const unsigned char sinetable[256] = {
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128,131,134,137,140,143,146,149,152,156,159,162,165,168,171,174,
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176,179,182,185,188,191,193,196,199,201,204,206,209,211,213,216,
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218,220,222,224,226,228,230,232,234,236,237,239,240,242,243,245,
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246,247,248,249,250,251,252,252,253,254,254,255,255,255,255,255,
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255,255,255,255,255,255,254,254,253,252,252,251,250,249,248,247,
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246,245,243,242,240,239,237,236,234,232,230,228,226,224,222,220,
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218,216,213,211,209,206,204,201,199,196,193,191,188,185,182,179,
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176,174,171,168,165,162,159,156,152,149,146,143,140,137,134,131,
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128,124,121,118,115,112,109,106,103,99, 96, 93, 90, 87, 84, 81,
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79, 76, 73, 70, 67, 64, 62, 59, 56, 54, 51, 49, 46, 44, 42, 39,
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37, 35, 33, 31, 29, 27, 25, 23, 21, 19, 18, 16, 15, 13, 12, 10,
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9, 8, 7, 6, 5, 4, 3, 3, 2, 1, 1, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 3, 4, 5, 6, 7, 8,
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9, 10, 12, 13, 15, 16, 18, 19, 21, 23, 25, 27, 29, 31, 33, 35,
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37, 39, 42, 44, 46, 49, 51, 54, 56, 59, 62, 64, 67, 70, 73, 76,
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79, 81, 84, 87, 90, 93, 96, 99, 103,106,109,112,115,118,121,124
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};
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uint8_t get_sine(uint8_t phase8) {
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return sinetable[phase8];
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}
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