[SOLVED] FSK demodulation poblem.

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hamidkavianathar

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I want to simulate the FSK demodulator. these are my parameters:
F1 = 16.5 kHz - 64 Hz, F2 = 16.5 kHz + 64 Hz.
as the difference between F1 and F2 is very small, I can't extract my data correctly. Can someone guide me?
thanks.
 

What's the timing of the accumulator control signals?

Summing quadrature magnitudes doesn't give the absolute magnitude, need to calculate squared sum.
 
FvM said:
What's the timing of the accumulator control signals?
Summing quadrature magnitudes doesn't give the absolute magnitude, need to calculate squared sum.
Click to expand...

thanks for your attention and your help.
I think calculated the sum in this block diagram:


and I have illustrated my signals in this image:


in the above image F1 = 16564Hz , F2 = 1643 Hz. the difference between F1 and F2 is very high, but I couldn't retrieve my data.
 

FvM said:
Squaring the product before accumulator can't be right.
Click to expand...

thank you. You helped me very much. I have no idea how I can thank you.:clap:
you're right. I modified it and it according what you said and now it works very well.
I want to ask you another question, do you know how i can make it robuster? I have not consider the distortions.
 
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