plz mail me a code for frequency modulator and demodulator
MATLAB: I WANT A CODE
fm modulatorhomeworkno attemptsendit2me
Related Solutions
Hey Mehdi,
I ran your code, couldn't understand anything really.
Try this one, you may see some modulation taking place at least, and then lets try to discuss what the problem is.
Fs = 8000; % Sampling rate of signal
Fc = 30; % Carrier frequency
t = [0:Fs-1]'/Fs; % Sampling times
s1 = sin(2*pi*2*t); % Channel 1
x = s1; % Two-channel signal
dev = 20; % Frequency deviation in modulated signal
y = fmmod(x,Fc,Fs,dev); % Modulate both channels.
plot(t,y,'r')hold onz = fmdemod(y,Fc,Fs,dev); % Demodulate both channels.
plot(t,z);legend('Modulated Signal','Demodulated Message');
Hi,
Here, message signal amplitude is ‘Am’,carrier signal amplitude is ‘Ac’,
1)Modulated signal is product of message signal and carrier signal ,amplitude of modulated signal is given by Am*Ac.
2)Demodulated signal is product of modulated signal and carrier signal,amplitude of demodulated signal is Am*Ac*Ac.
3)To get this demodulated signal amplitude equal to message signal it needs to be divided by Ac*Ac
Refer to below attached code for better understanding:
t = 0:0.001:5;fH = 15;fL = 2;Ah=5;Al=10;xH = Ah*sin(2*pi*fH.*t);xL = Al*sin(2*pi*fL.*t);% Modulation
y = xL.*xH;% De-Modulation By Synchoronous Method
m = (y.*xH)./(Ah*Ah);% Filtering High Frequencies
[n,w] = buttord(2/1000,4/1000,.5,5);[a,b] = butter(n,w,'low');dem = filter(a,b,m);subplot(2,2,1);plot(t,xH,'b',t,xL,'r');title('m(t) & c(t)');grid;subplot(2,2,2);plot(t,y,'k');title('DSBSC');grid;subplot(2,2,3);plot(t,m);title('De-Modulated');grid;
Best Answer