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AM DEMODULATOR WITHOUT USING AMDEMOD FUNCTION

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pss aditya
pss aditya on 19 Aug 2020
Answered: Dinesh Yadav on 25 Aug 2020
how do we write a code for am demodulator without using amdemod function?
i want to write the codes without the predefined functions.

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Dinesh Yadav
Dinesh Yadav on 25 Aug 2020
If you want to write code for demodulation without using amdemod, then you need to first select which method are you going to use for demodulation: Envelope Detector , Square law demodulator etc.
Assuming you select Square law Detector, you have a AM equation of form
V(t) = A(1+km(t))cos(2*pi*fc*t);
need to mathematically model the behaviour of square law device into equations of form
Vsq(t)= k1V(t) + k1(V(t)*V(T)) + ...
then you need to mathematically model a low pass filter and pass the signal through it(model this behaviour either by convolution or convert to frequency domain and multiply both filter response and Square law output and then inverse fourier to get time domian signal) to get AM output.

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