FREKUENSI SAMPLING

1. fk = 2*sin(2*50*f*k*T);

a.        Script Program

N=64;

T= 1/128;

f= 50;

k= 0:N-1

x= 2*sin(2*pi*f*k*T);

Xf=fft(x)

magXf=abs (Xf);

subplot (3,1,1); plot (x)

subplot (3,1,2)

stem (k(1:N/2), magXf(1:N/2));

xlabel ('k')

hertz=k*(1/(N*T));

subplot (3,1,3)

stem (hertz (1:N/2),magXf(1:N/2))

xlabel ('Hz')

b.      Figure

2.       gk=cos (pi*250*k*T)-sin (pi*200*k*T)

a.       Script Program

N= 64;

T= 1/400;

k= 0:N-1;

f1= 250;

f2= 200;

x1= cos(pi*f1*k*T);

x2= sin (pi*f2*k*T);

gk= x1-x2;

Xf=fft(gk);

magXf=abs (Xf);

subplot (3,1,1); plot (x)

subplot (3,1,2)

stem (k(1:N/2), magXf(1:N/2));

xlabel ('k')

hertz=k*(1/(N*T));

subplot (3,1,3)

stem (hertz (1:N/2),magXf(1:N/2));

xlabel ('Hz')

b.Figure

3.       hk= 5-sin (1000*k*T)

a.       Script Program

N= 32;

T= 1/2000;

f= 1000;

k= 0:N-1;

x= 5- sin (f*k*T);

Xf=fft(x);

magXf=abs (Xf);

subplot (3,1,1); plot (x)

subplot (3,1,2)

stem (k(1:N/2), magXf(1:N/2));

xlabel ('k')

hertz=k*(1/(N*T));

subplot (3,1,3)

stem (hertz (1:N/2),magXf(1:N/2));

xlabel ('Hz')

b.      Figure

4.       mk= 4 sin (f*pi*k*T-pi/4)

a.       Script Program

N= 64;

T= 1/500;

f= 250;

k= 0:N-1;

x= 4*sin((f*pi*k*T)- (pi/4));

Xf=fft(x);

magXf=abs (Xf);

subplot (3,1,1); plot (x)

subplot (3,1,2)

stem (k(1:N/2), magXf(1:N/2));

xlabel ('k')

hertz=k*(1/(N*T));

subplot (3,1,3)

stem (hertz (1:N/2),magXf(1:N/2));

xlabel ('Hz')

b.      Figure