Проектирование цифрового фильтра

Автор работы: Пользователь скрыл имя, 05 Декабря 2012 в 16:26, курсовая работа

Краткое описание

Данный курсовой проект выполняется с целью закрепления знаний, полученных при изучении курса «Процессоры для цифровой обработки сигналов», и развития навыков самостоятельного проектирования цифровых устройств фильтрации с использованием современной элементной базы.
Цифровая фильтрация является одним из основных направлений цифровой обработки сигналов (далее ЦОС). В настоящее время она имеет широкое применение. Поэтому тема данного проекта особо актуальна, учитывая и то, что для разработки используется современная элементная база зарубежных фирм-производителей, лидеров мирового рынка устройств для цифровой и аналоговой обработки сигналов.

Содержание

Введение 3
1. Постановка задачи проектирования 4
2. Анализ задачи и выбор рационального способа решения 5
3. Разработка алгоритмов фильтрации 7
3.1. Синтез ядра фильтра 7
3.2. Свертка с использованием БПФ 12
3.3. Алгоритм БПФ 15
3.4. Моделирование алгоритмов и проверка работоспособности 18
4. Разработка принципиальной схемы 21
4.1. Выбор элементной базы 21
4.2. Построение схемы 24
5. Разработка программного обеспечения 28
6. Оценка временных параметров 34
Заключение 38
Список использованной литературы 39
ПРИЛОЖЕНИЕ 40

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   if(in_index==M)

    {

     in_index=0;

     frame1_fl=true;//установка флага, свидетельствующего о том,

//что первый  буфер заполнен

     frame2in_fl=true;

     frame1in_fl=false;

     return;

    }

   else in_index++;

  }

else if(frame2in_fl)//запись во второй буфер

  {

   frame2_re[in_index]=*(McBSP1_DRR1);//чтение из порта

   if(in_index==M)

    {

     in_index=0;

     frame2_fl=true;//установка флага, свидетельствующего о том,

//что второй  буфер заполнен

     frame1in_fl=true;

     frame2in_fl=false;//флаги показывают, что нужно писать в первый буфер

     return;

    }

   else in_index++;

  }

}

 

void Filter(short Fd,short Fc,short* h)

{

int i,j;

double tmp, tempH, tempL;

double Hh[M],Hl[M];

double suml=0, sumh=0;

for (i=- halfM;i< halfM;i++)

{

j=i+ halfM; // i=- halfM.. halfM j=0..M

if (i==0)

  {

  Hh[halfM]=1;

  Hl[halfM]=1;

  }

else

  {

  tmp= PiFFC2*i;

  tempH=tmp*2*fh;

  tempH=sin(tempH);

  tempL=tmp*2*fl;

  tempL=sin(tempL);

  Hh[j]=tempH/tmp;

  Hl[j]=tempL/tmp;

  }

//окно

Hl[j]=Hl[j]* Blackman [j];

 Hh[j]=Hh[j]* Blackman [j];

 //сумма для нормализации

 suml+=Hl[j];

 sumh+=Hh[j];

}

//нормализация

for (i=0;i<M;i++)

 {

Hl[i]/=suml;

 Hh[i]/=sumh;

H[i]=Hh[i]-Hl[i];

}

return;

}

 

void BPF(short* x,short* y,short N,short I)

{

 short t1,t2,t3,t4;

 short i,j,k,m,p,l,L,M,M1,K;

L=N;

 M=N/2;

 M1=N-1;

if(I==-1)//если обратное преобразование, то инверсия мнимой части

    {

     for(i=0;i<N;i++)*(y+i)=-*(y+i);

    }

m=1;

while(L>=2)

  {

   l=L/2;

   k=0;

   for(j=0;j<l;j++)

     {

      for(i=j;i<N;i+=L)

        {

         p=i+l;

         t1=*(x+i)+*(x+p);

         t2=*(y+i)+*(y+p);

         t3=*(x+i)-*(x+p);

         t4=*(y+i)-*(y+p);

         *(x+p)=t3*Wre[k]-t4*Wim[k];

         *(y+p)=t4*Wre[k]+t3*Wim[k];

         *(x+i)=t1;

         *(y+i)=t2;

        }

      k+=m;

     }

   L/=2;

   m*=2;

  }

 j=0;

 for(i=0;i<M1;i++)   //прореживание по частоте

   {

    if(i>j)

      {

       t1=*(x+j);

       t2=*(y+j);

       *(x+j)=*(x+i);

       *(y+j)=*(y+i);

       *(x+i)=t1;

       *(y+i)=t2;

      }

     K=M;

     while(j>=K)

      {

       j-=K;

       K/=2;

      }

     j+=K;

   }

  if(I==-1)//нормализация при обратном преобразовании

   {

    for(i=0;i<N;i++)

    {

     *(x+i)/=N;

     *(y+i)/=N;

    }

   }

}

 

Таблица векторов прерываний

//**************************************************************************

//* S/W Interrupts

//**************************************************************************

SINT17 return_enable

nop

nop

nop

SINT18 return_enable

nop

nop

nop

SINT19 return_enable

nop

nop

nop

SINT20 return_enable

nop

nop

nop

SINT21 return_enable

nop

nop

nop

SINT22 return_enable

nop

nop

nop

SINT23 return_enable

nop

nop

nop

SINT24 return_enable

nop

nop

nop

SINT25 return_enable

nop

nop

nop

SINT26 return_enable

nop

nop

nop

SINT27 return_enable

nop

nop

nop

SINT28 return_enable

nop

nop

nop

SINT29 return_enable

nop

nop

nop

SINT30 return_enable

nop

nop

nop

 

 

//**************************************************************************

//* Rest of the Interrupts

//**************************************************************************

INT0: return_enable

nop

nop

nop

INT1: return_enable

nop

nop

nop

INT2: return_enable

nop

nop

nop

TINT0: dgoto timer_interrupt

nop

nop

BRINT0: return_enable

nop

nop

nop

BXINT0: return_enable

nop

nop

nop

TRINT: return_enable

nop

nop

nop

TXINT: return_enable

nop

nop

nop

INT3: return_enable

nop

nop

nop

HPINT: return_enable

nop

nop

nop

BRINT1: dgoto McBSP1_Rinterrupt

nop

nop

BXINT1: return_enable

nop

nop

nop

DMAC4: return_enable

nop

nop

nop

DMAC5: return_enable

nop

nop

nop

 

 

short Blackman[]= {0.00000,0.00001,0.00005,0.00012,0.00022,0.00034,0.00049,0.00067,0.00087,0.00111,

0.00137,0.00166,0.00197,0.00232,0.00269,0.00310,0.00353,0.00399,0.00448,0.00500,

0.00555,0.00614,0.00675,0.00739,0.00807,0.00878,0.00952,0.01029,0.01110,0.01194,

0.01282,0.01373,0.01467,0.01565,0.01667,0.01772,0.01881,0.01994,0.02111,0.02231,

0.02356,0.02484,0.02617,0.02753,0.02894,0.03039,0.03188,0.03341,0.03499,0.03661,

0.03828,0.03999,0.04175,0.04356,0.04541,0.04731,0.04926,0.05126,0.05331,0.05541,

0.05755,0.05975,0.06201,0.06431,0.06667,0.06908,0.07154,0.07406,0.07663,0.07926,

0.08195,0.08469,0.08749,0.09035,0.09326,0.09623,0.09926,0.10235,0.10550,0.10871,

0.11198,0.11531,0.11870,0.12215,0.12567,0.12924,0.13288,0.13658,0.14034,0.14416,

0.14805,0.15200,0.15601,0.16008,0.16422,0.16842,0.17269,0.17701,0.18140,0.18586,

0.19037,0.19495,0.19959,0.20430,0.20906,0.21389,0.21878,0.22373,0.22874,0.23382,

0.23895,0.24415,0.24940,0.25471,0.26009,0.26552,0.27100,0.27655,0.28215,0.28781,

0.29352,0.29929,0.30512,0.31099,0.31692,0.32290,0.32893,0.33501,0.34114,0.34732,

0.35354,0.35981,0.36613,0.37249,0.37889,0.38534,0.39183,0.39835,0.40492,0.41152,

0.41816,0.42483,0.43154,0.43828,0.44505,0.45185,0.45868,0.46553,0.47241,0.47932,

0.48624,0.49319,0.50016,0.50714,0.51415,0.52116,0.52819,0.53523,0.54228,0.54934,

0.55641,0.56348,0.57055,0.57763,0.58470,0.59178,0.59885,0.60591,0.61297,0.62001,

0.62705,0.63407,0.64108,0.64807,0.65505,0.66200,0.66893,0.67584,0.68272,0.68958,

0.69640,0.70319,0.70995,0.71668,0.72337,0.73001,0.73662,0.74319,0.74971,0.75618,

0.76261,0.76898,0.77530,0.78157,0.78779,0.79394,0.80004,0.80608,0.81205,0.81795,

0.82380,0.82957,0.83527,0.84090,0.84646,0.85194,0.85735,0.86267,0.86792,0.87308,

0.87817,0.88316,0.88807,0.89289,0.89763,0.90227,0.90682,0.91127,0.91563,0.91990,

0.92406,0.92813,0.93209,0.93596,0.93972,0.94337,0.94692,0.95037,0.95370,0.95693,

0.96005,0.96305,0.96595,0.96873,0.97140,0.97395,0.97639,0.97871,0.98092,0.98300,

0.98497,0.98682,0.98855,0.99017,0.99166,0.99302,0.99427,0.99540,0.99640,0.99728,

0.99804,0.99867,0.99918,0.99957,0.99984,0.99998,0.99999,0.99988,0.99965,0.99930,

0.99882,0.99822,0.99749,0.99664,0.99567,0.99458,0.99336,0.99202,0.99056,0.98898,

0.98728,0.98546,0.98353,0.98147,0.97929,0.97700,0.97459,0.97207,0.96943,0.96668,

0.96381,0.96084,0.95775,0.95455,0.95124,0.94782,0.94430,0.94067,0.93694,0.93310,

0.92916,0.92512,0.92099,0.91675,0.91241,0.90798,0.90346,0.89884,0.89413,0.88933,

0.88444,0.87947,0.87441,0.86927,0.86404,0.85873,0.85335,0.84789,0.84235,0.83674,

0.83105,0.82530,0.81948,0.81358,0.80763,0.80161,0.79553,0.78939,0.78319,0.77693,

0.77063,0.76426,0.75785,0.75139,0.74488,0.73833,0.73173,0.72509,0.71842,0.71170,

0.70495,0.69817,0.69135,0.68450,0.67763,0.67073,0.66380,0.65685,0.64988,0.64290,

0.63589,0.62887,0.62184,0.61479,0.60774,0.60068,0.59361,0.58654,0.57946,0.57239,

0.56531,0.55824,0.55117,0.54411,0.53706,0.53002,0.52298,0.51596,0.50896,0.50197,

0.49500,0.48804,0.48111,0.47420,0.46731,0.46045,0.45362,0.44681,0.44003,0.43328,

0.42657,0.41988,0.41324,0.40662,0.40005,0.39351,0.38702,0.38056,0.37415,0.36777,

0.36145,0.35516,0.34893,0.34274,0.33659,0.33050,0.32446,0.31846,0.31252,0.30663,

0.30080,0.29501,0.28929,0.28361,0.27800,0.27244,0.26693,0.26149,0.25610,0.25077,

0.24550,0.24029,0.23514,0.23005,0.22502,0.22006,0.21515,0.21031,0.20552,0.20080,

0.19615,0.19155,0.18702,0.18255,0.17814,0.17380,0.16952,0.16530,0.16115,0.15706,

0.15303,0.14907,0.14516,0.14132,0.13755,0.13383,0.13018,0.12659,0.12306,0.11959,

0.11618,0.11284,0.10955,0.10633,0.10316,0.10006,0.09701,0.09403,0.09110,0.08823,

0.08541,0.08265,0.07995,0.07731,0.07472,0.07219,0.06971,0.06729,0.06492,0.06260,

0.06033,0.05812,0.05596,0.05385,0.05179,0.04977,0.04781,0.04590,0.04403,0.04222,

0.04045,0.03872,0.03704,0.03541,0.03382,0.03227,0.03077,0.02931,0.02789,0.02652,

0.02518,0.02389,0.02263,0.02142,0.02024,0.01910,0.01800,0.01694,0.01591,0.01492,

0.01397,0.01305,0.01217,0.01132,0.01050,0.00972,0.00897,0.00825,0.00757,0.00691,

0.00629,0.00570,0.00514,0.00461,0.00411,0.00364,0.00320,0.00279,0.00241,0.00206,

0.00174,0.00144,0.00117,0.00093,0.00072,0.00053,0.00038,0.00025,0.00014,0.00007,

0.00002};

 

short Wre[]= {1.00000,0.99998,0.99992,0.99983,0.99970,0.99953,0.99932,0.99908,0.99880,0.99848,

0.99812,0.99773,0.99729,0.99682,0.99632,0.99577,0.99519,0.99457,0.99391,0.99322,

0.99249,0.99172,0.99091,0.99007,0.98919,0.98827,0.98731,0.98632,0.98529,0.98423,

0.98312,0.98198,0.98080,0.97959,0.97834,0.97705,0.97573,0.97437,0.97297,0.97153,

0.97006,0.96855,0.96701,0.96543,0.96381,0.96216,0.96047,0.95875,0.95698,0.95519,

0.95335,0.95148,0.94958,0.94764,0.94566,0.94365,0.94160,0.93952,0.93740,0.93525,

0.93306,0.93084,0.92858,0.92628,0.92396,0.92159,0.91919,0.91676,0.91430,0.91179,

0.90926,0.90669,0.90409,0.90145,0.89878,0.89607,0.89333,0.89056,0.88775,0.88491,

0.88204,0.87913,0.87619,0.87322,0.87022,0.86718,0.86411,0.86100,0.85787,0.85470,

0.85150,0.84827,0.84501,0.84171,0.83838,0.83503,0.83164,0.82821,0.82476,0.82128,

0.81776,0.81422,0.81064,0.80704,0.80340,0.79973,0.79604,0.79231,0.78855,0.78477,

0.78095,0.77711,0.77323,0.76933,0.76540,0.76143,0.75744,0.75343,0.74938,0.74530,

0.74120,0.73707,0.73291,0.72873,0.72451,0.72027,0.71600,0.71171,0.70739,0.70304,

0.69867,0.69426,0.68984,0.68538,0.68091,0.67640,0.67187,0.66732,0.66274,0.65813,

0.65350,0.64885,0.64417,0.63947,0.63474,0.62999,0.62521,0.62042,0.61559,0.61075,

0.60588,0.60099,0.59608,0.59114,0.58619,0.58121,0.57620,0.57118,0.56614,0.56107,

0.55598,0.55088,0.54575,0.54060,0.53543,0.53024,0.52503,0.51980,0.51455,0.50928,

0.50400,0.49869,0.49336,0.48802,0.48266,0.47728,0.47188,0.46646,0.46103,0.45558,

0.45011,0.44463,0.43912,0.43361,0.42807,0.42252,0.41696,0.41137,0.40578,0.40016,

0.39454,0.38889,0.38324,0.37756,0.37188,0.36618,0.36046,0.35474,0.34900,0.34324,

0.33748,0.33170,0.32590,0.32010,0.31428,0.30846,0.30262,0.29677,0.29090,0.28503,

0.27915,0.27325,0.26735,0.26143,0.25551,0.24958,0.24363,0.23768,0.23172,0.22575,

0.21977,0.21378,0.20779,0.20178,0.19577,0.18976,0.18373,0.17770,0.17166,0.16562,

0.15956,0.15351,0.14744,0.14138,0.13530,0.12922,0.12314,0.11705,0.11096,0.10486,

0.09876,0.09266,0.08655,0.08044,0.07432,0.06820,0.06208,0.05596,0.04984,0.04371,

0.03758,0.03146,0.02532,0.01919,0.01306,0.00693,0.00080,-0.00534,-0.01147,-0.01760,

-0.02373,-0.02986,-0.03599,-0.04212,-0.04825,-0.05437,-0.06049,-0.06662,-0.07273,

-0.07885,-0.08496,-0.09107,-0.09718,-0.10328,-0.10938,-0.11547,-0.12156,-0.12764,

-0.13372,-0.13980,-0.14587,-0.15193,-0.15799,-0.16404,-0.17009,-0.17613,-0.18217,

-0.18819,-0.19421,-0.20022,-0.20623,-0.21223,-0.21821,-0.22420,-0.23017,-0.23613,

-0.24209,-0.24803,-0.25397,-0.25990,-0.26581,-0.27172,-0.27762,-0.28350,-0.28938,

-0.29524,-0.30110,-0.30694,-0.31277,-0.31859,-0.32440,-0.33019,-0.33598,-0.34175,

-0.34750,-0.35325,-0.35898,-0.36470,-0.37040,-0.37609,-0.38176,-0.38742,-0.39307,

-0.39870,-0.40432,-0.40992,-0.41551,-0.42108,-0.42663,-0.43217,-0.43769,-0.44320,

-0.44869,-0.45416,-0.45962,-0.46505,-0.47047,-0.47588,,-0.48126,-0.48663,-0.49198,

-0.49731,-0.50262,-0.50791,-0.51318,-0.51844,-0.52367-0.52889,-0.53408,-0.53926,

-0.54441,-0.54955,-0.55466,-0.55975,-0.56482,-0.56987,-0.57490,-0.57991,-0.58489,

-0.58986,-0.59480,-0.59972,-0.60461,-0.60949,-0.61434,-0.61917,-0.62397,-0.62875,

-0.63351,-0.63824,-0.64295,-0.64764,-0.65230,-0.65693,-0.66154,-0.66613,-0.67069,

-0.67523,-0.67974,-0.68422,-0.68868,-0.69312,-0.69753,-0.70191,-0.70626,-0.71059,

-0.71489,-0.71917,-0.72341,-0.72763,-0.73183-0.73599,-0.74013,-0.74424,-0.74832,

-0.75238,-0.75640,-0.76040,-0.76437,-0.76831,-0.77222,-0.77610,-0.77996,-0.78378,

-0.78757,-0.79134,-0.79507,-0.79878,-0.80245,-0.80610,-0.80971,-0.81329,-0.81685,

-0.82037,-0.82386,-0.82732,-0.83075,-0.83415,-0.83751,-0.84085,-0.84415,-0.84743,

-0.85067,-0.85387,-0.85705,-0.86019,-0.86330,-0.86638,-0.86943,-0.87244,-0.87542,

-0.87837,-0.88129,-0.88417,-0.88702,-0.88983,-0.89261,-0.89536,-0.89808,-0.90076,

-0.90340,-0.90602,-0.90859,-0.91114,-0.91365,-0.91613,-0.91857,-0.92097,-0.92335,

-0.92568,-0.92799,-0.93025,-0.93249,-0.93468,-0.93685,-0.93897,-0.94107,-0.94312,

-0.94514,-0.94713,-0.94908,-0.95099,-0.95287,-0.95471,-0.95652,-0.95829,-0.96003,

-0.96172,-0.96339,-0.96501,-0.96660,-0.96816,-0.96967,-0.97115,-0.97260,-0.97401,

-0.97538,-0.97671,-0.97801,-0.97927,-0.98049,-0.98168,-0.98283,-0.98394,-0.98502,

-0.98606,-0.98706,-0.98802,-0.98895,-0.98984,-0.99070,-0.99151,-0.99229,-0.99303,

-0.99374,-0.99440,-0.99503,-0.99562,-0.99618,-0.99670,-0.99717,-0.99762,-0.99802,

-0.99839,-0.99872,-0.99901,-0.99926,-0.99948,-0.99966,-0.99980,-0.99990,-0.99997};

 

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Информация о работе Проектирование цифрового фильтра