FM DEMODULATION

[isa12]

Hello, i have done the FM modulation but i can't  recover the signal while demodulating ,i will appreciate any help

[isa12]

I am sorry i forgot to mention the main problem ,during demodulation the signal gets attenuated  when i reduce : frequency deviation , carrier frequency and baseband signal frequency  but when they are high the signal seems fine , please help 

[isa12]

It seems there is no one qualified to answer my question ,i hope this vi helps people in future simulating FM modulation ,thanks to all

[mcduff]

Look in the Example Finder under FM. This is what I found. I really can't follow your VI, but it doesn't look like you are doing the mixing correctly.

mcduff

[isa12]

the modulation part works ,it is the demodulation that is the problem 

[mcduff · Accepted solution]

I can't reproduce your picture with your VI; the plots just show zero. From the bottom plot in your picture it looks like you are demodulating the message.

I did something similar awhile ago, on a FPGA, where I multiplied the modulated signal by Cos and Sin of the carrier frequency, low pass to get I & Q, then do the Arctan to demodulate.

Sorry I can't help.

mcduff

[isa12]

after you run the vi adjust all the parameter like baseband frequency ,amplitude and so on ,you will see the plots 

thanks for the advice it really helps