const int indextab[4][16][2]={{{0,0},{353,384},{353,415},{384,415}			//前向信號倍頻系數(shù)
							  ,{353,445},{384,445},{415,445},{353,476}
							  ,{384,476},{415,476},{445,476},{353,507}
							  ,{384,507},{415,507},{445,507},{476,507}},
							  {{0,0},{292,261},{292,230},{261,230}		//后向信號倍頻系數(shù)
							  ,{292,200},{261,200},{230,200},{292,169}
							  ,{261,169},{230,169},{200,169},{292,138}
							  ,{292,138},{230,138},{200,138},{169,138}},
							  {{418,241},{310,178},{342,178},{378,178}	//DTMF信號倍頻系數(shù)
							  ,{310,197},{342,197},{378,197},{310,218}
							  ,{342,218},{378,218},{342,241},{310,241}
							  ,{378,241},{418,178},{418,197},{418,218}},
							  {{23,0},{48,0},{130,0},{0,0}
							  ,{0,0},{0,0},{0,0},{0,0}
							  ,{0,0},{0,0},{0,0},{0,0}
							  ,{0,0},{0,0},{0,0},{0,0}}};

const int cosefftab[4][8]={{3832,3134,2408,1661,899,1290,0}		//前向cos系數(shù)
				,{6993,6737,6424,6053,4777,4080,3270,2328}		//DTMFcos系數(shù)
				,{7464,7114,6701,6228,5700,5121,0,0}			//后向cos系數(shù)
				,{0,0,0,0,0,0,0,0}};							//單頻cos系數(shù)

const unsigned decodetab[4][16]={{0x0,0x03,0x05,0x06,0x09,0x0A,0x0C,0x11		//前向信號編碼反查表
							  	 ,0x12,0x14,0x18,0x21,0x22,0x24,0x28,0x30},
							  	 {0x88,0x11,0x21,0x41,0x12,0x22,0x42,0x14		//DTMF信號編碼反查表
							  	 ,0x24,0x44,0x28,0x18,0x48,0x81,0x82,0x84},	
							  	 {0x0,0x30,0x28,0x24,0x22,0x21,0x18,0x14		//后向信號編碼反查表
							  	 ,0x12,0x11,0x0C,0x0A,0x09,0x06,0x05,0x03},	
							  	 {0x0,0x01,0x02,0x04,0,0,0,0					//單頻信號編碼反查表
							  	 ,0,0,0,0,0,0,0,0}};



/*
//前向信號倍頻系數(shù)			
//const int forwardcosf[6]={1380,1500,1620,1740,1860,1980};	
const int forcoseff[6]={3832,3134,2408,1661,899,129};	
const int forward[16][2]={{0,0},{353,384},{353,415},{384,415}
							,{353,445},{384,445},{415,445},{353,476}
							,{384,476},{415,476},{445,476},{353,507}
							,{384,507},{415,507},{445,507},{476,507}};//后向信號倍頻系數(shù)
//const int backwardcosf[6]={540,660,780,900,1020,1140};
const int backcoseff[6]={7464,7114,6701,6228,5700,5121};
const int backward[16][2]={{0,0},{292,261},{292,230},{261,230}
							,{292,200},{261,200},{230,200},{292,169}
							,{261,169},{230,169},{200,169},{292,138}
							,{292,138},{230,138},{200,138},{169,138}};
		
//DTMF倍頻系數(shù)
//{697,770,852,941,1207,1336,1477,1633}
const int DTMFcoseff[8]={6993,6737,6424,6053,4777,4080,3270,2328};
//const int DTMF[16][2]={{940,1640},{700,1200},{697,1336},{697,1477}
//						,{770,1209},{770,1336},{770,1477},{852,1209}
//						,{852,1336},{852,1477},{941,1336},{941,1209}
//						,{941,1477},{697,1633},{770,1633},{820,1633}};

const int DTMF[16][2]={{418,241},{310,178},{342,178},{378,178}
						,{310,197},{342,197},{378,197},{310,218}
						,{342,218},{378,218},{342,241},{310,241}
						,{378,241},{418,178},{418,197},{418,218}};

//單頻信號倍頻系數(shù)
const int Single[3]={23,48,130};

//前向信號編碼反查表
const unsigned fortab[15]={0x03,0x05,0x06,0x09,0x0A,0x0C,0x11,0x12
							,0x14,0x18,0x21,0x22,0x24,0x28,0x30};
//后向信號編碼反查表
const unsigned backtab[15]={0x30,0x28,0x24,0x22,0x21,0x18,0x14,0x12
							,0x11,0x0C,0x0A,0x09,0x06,0x05,0x03};	
//DTMF信號編碼反查表
const unsigned DTMFtab[16]={0x88,0x11,0x21,0x41,0x12,0x22,0x42
							,0x14,0x24,0x44,0x28,0x18,0x48,0x81
							,0x82,0x84};	
//單頻信號編碼反查表
const unsigned Singletab[3]={0x01,0x02,0x04};*/


//3.90625Hz的正弦表
const int MFC[2048]={0,50,101,151,201,251,302,352,402,452,503,553,603,653,703,754,
804,854,904,954,1005,1055,1105,1155,1205,1255,1305,1356,1406,1456,1506,1556,
1606,1656,1706,1756,1806,1856,1906,1956,2006,2055,2105,2155,2205,2255,2304,2354,
2404,2454,2503,2553,2603,2652,2702,2751,2801,2850,2900,2949,2999,3048,3098,3147,
3196,3246,3295,3344,3393,3442,3491,3541,3590,3639,3688,3737,3786,3834,3883,3932,
3981,4030,4078,4127,4176,4224,4273,4321,4370,4418,4466,4515,4563,4611,4660,4708,
4756,4804,4852,4900,4948,4996,5044,5091,5139,5187,5235,5282,5330,5377,5425,5472,
5519,5567,5614,5661,5708,5755,5802,5849,5896,5943,5990,6037,6083,6130,6177,6223,
6270,6316,6362,6409,6455,6501,6547,6593,6639,6685,6731,6777,6823,6868,6914,6959,
7005,7050,7096,7141,7186,7231,7276,7321,7366,7411,7456,7501,7545,7590,7634,7679,
7723,7767,7812,7856,7900,7944,7988,8032,8075,8119,8163,8206,8250,8293,8336,8380,
8423,8466,8509,8552,8595,8637,8680,8723,8765,8808,8850,8892,8934,8976,9018,9060,
9102,9144,9186,9227,9269,9310,9351,9393,9434,9475,9516,9557,9597,9638,9679,9719,
9760,9800,9840,9880,9920,9960,10000,10040,10080,10119,10159,10198,10237,10277,10316,10355,
10394,10432,10471,10510,10548,10587,10625,10663,10701,10739,10777,10815,10853,10890,10928,10965,
11002,11040,11077,11114,11151,11187,11224,11261,11297,11333,11370,11406,11442,11478,11514,11549,
11585,11620,11656,11691,11726,11761,11796,11831,11866,11900,11935,11969,12003,12038,12072,12106,
12139,12173,12207,12240,12273,12307,12340,12373,12406,12438,12471,12504,12536,12568,12601,12633,
12665,12696,12728,12760,12791,12823,12854,12885,12916,12947,12977,13008,13039,13069,13099,13129,
13159,13189,13219,13249,13278,13307,13337,13366,13395,13424,13453,13481,13510,13538,13566,13594,
13622,13650,13678,13706,13733,13760,13788,13815,13842,13868,13895,13922,13948,13974,14001,14027,
14053,14078,14104,14130,14155,14180,14205,14230,14255,14280,14304,14329,14353,14377,14401,14425,
14449,14473,14496,14519,14543,14566,14589,14611,14634,14657,14679,14701,14723,14745,14767,14789,
14811,14832,14853,14874,14895,14916,14937,14958,14978,14998,15018,15038,15058,15078,15098,15117,
15136,15156,15175,15193,15212,15231,15249,15268,15286,15304,15322,15339,15357,15374,15392,15409,