computer science HW
faisal0z
lab_10.rtfName: Omar Alzaid, Adel alkanhal(partner)
Course: ECE 206
Exercise #10: C++ Programming - Finite Impulse Response Filter (using Array)
Date: 4/29/2016
Problem Statement:
A given optimal equiripple FIR filter has the following specification: Sample rate: 10 kHz (0.1 ms/sample); Passband: 0 – 2.5 kHz (lowpass), 0.5 dB maximum ripple. Stopband: 3.0 – 5 kHz, 50dB minimum attenuation
Using the Parks-Mcclellan program, we obtain the following impulse response values (scaled by 215; ie. to get actual value, divide by 215). h(0) = h(34) = 361.922 h(9) = h(25) = 812.822 h(1) = h(33) = 589.000 h(10) = h(24) = -934.419 h(2) = h(32) = 52.556 h(11) = h(23) = -1082.725 h(3) = h(31) = -538.095 h(12) = h(22) = 1547.666 h(4) = h(30) = -58.657 h(13) = h(21) = 1083.109 h(5) = h(29) = 499.472 h(14) = h(20) = -3229.928 h(6) = h(28) = -251.531 h(15) = h(19) = -1275.738 h(7) = h(27) = -785.168 h(16) = h(18) = 10268.660 h(8) = h(26) = 381.999 h(17) = h(17) = 17571.900
1. Create three arrays x[600], h[600], and y[600]
2. Fill the x array with the 600 sample values of x(t) = 100 sin (4000 π t ) for 0t < 0.06 with rate of t = 0.0001 3. Compute y[n] for 0n < 600 4. Store the 600 sample values of x[n] in file filex and store the 600 sample values of y[n] in file filey. 5. Graph x[n] and y[n] on the same graph using Excel. Compare the amplitude of the two sinewaves x[n] and y[n].
Copy of Program:
#include <iostream>
#include <fstream>
#include <cmath>
#include <iomanip>
using namespace std;
int main()
{
int count, N;
double long i[600], j[600];
double long t = 0, sum = 0;
double pi = 3.1415;
ofstream outputfilex, outputfiley;
outputfilex.open("i.txt");
outputfiley.open("j.txt");
double h[35] = {
361.922, 589.0001, 52.556, -538.095, -58.657, 499.472, -251.531,
-785.16, 381.999, 812.822, -934.41, -1082.725, 1547.66, 1083.109,
-3229.92, -1275.73, 10268.660, 17571.90, 10268.660, -1275.73, -3229.92,
1083.109, 1547.66, -1082.725, -934.41, 812.822, 381.999, -785.16,
-251.531, 499.472, -58.657, -538.095, 52.556, 589.0001, 361.922 };
for (count = 0; count < 100; count++)
{
i[count] = 100 * sin(4000 * pi * t);
t += .0001;
cout << "t = " << t << " i= " << i[count] << endl;
outputfilex << i[count] << endl;
}
for (count = 0; count < 100; count++)
{
for (N = 0; N< 35; k++)// Setting the N <35
{
sum += x[count - N] * h[k] / 32768;
}
if ((count - N) >= 0)
j[count] = sum;
else j[count] = 0;
outputfiley << j[count] << endl;
sum = 0;
}
outputfilex.close();
outputfiley.close();
system("Pause");
return 0;
}
Problems encountered : The program had error in running because the it was hard at coding the function. But then we found our errors and fixed them. Another thing we have encountered, sorting the data in text file.
Comments:
Before starting writing the code, we should always make sure that we the exact instructions.
Xl data and graphs
0
0
95.0859
0
58.8816
0
-58.6238
0
-95.1841
0
-0.31853
0
94.9868
0
59.1387
0
-58.3654
0
-95.2813
0
-0.63706
0
94.8868
0
59.3953
0
-58.1065
0
-95.3775
0
-0.95558
0
94.7857
0
59.6512
0
-57.847
0
-95.4727
0
-1.27409
0
94.6837
0
59.9066
0
-57.5869
0
-95.567
0
-1.59259
0
94.5808
0
60.1613
0
-57.3261
0
-95.6603
0
-1.91107
0
94.4769
0
60.4155
0
-57.0649
0
-95.7526
0
-2.22953
-56.2556
94.372
-92.8462
60.669
-1.23904
-56.803
92.079
-95.844
58.2585
-2.54797
-56.0026
94.2662
-92.9379
60.9219
-1.54877
-56.5406
91.9788
-95.9344
58.5063
-2.86638
-55.7491
94.1594
-93.0287
61.1742
-1.85849
-56.2775
91.8778
-96.0238
58.7534
-3.18477
-55.495
94.0516
-93.1184
61.4258
-2.1682
-56.014
91.7758
-96.1122
59
-3.50312
-55.2403
93.9429
-93.2073
61.6769
-2.47787
-55.7498
91.6729
-96.1997
59.2459
-3.82144
-54.9851
93.8333
-93.2952
61.9273
-2.78753
-55.4851
91.569
-96.2862
59.4913
-4.13972
-54.7293
93.7227
-93.3822
62.1771
-3.09715
-55.2198
91.4643
-96.3717
59.736
-4.45795
-54.473
93.6111
-93.4682
62.4262
-3.40675
-54.954
91.3585
-96.4562
59.9801
-4.77614
-54.2161
93.4986
-93.5532
62.6748
-3.71631
-54.6876
91.2519
-96.5398
60.2237
-5.09429
-53.9587
93.3852
-93.6373
62.9226
-4.02583
-54.4206
91.1444
-96.6224
60.4666
-5.41238
-53.7007
93.2708
-93.7205
63.1699
-4.33531
-54.1531
91.0359
-96.704
60.7089
-5.73041
-53.4422
93.1554
-93.8027
63.4165
-4.64475
-53.885
90.9265
-96.7846
60.9506
-6.04839
-53.1831
93.0391
-93.884
63.6625
-4.95414
-53.6164
90.8161
-96.8642
61.1916
