AM envelope detection problem

[ASHLY19]

Hi everyone:

I try to build AM transmitter and receiver on lab view there is no problem on the transmitter, the problem is that the modulating signal passes through band pass filter To remove unwanted interference around carrier frequency, design a fifth order “Chebyshev” band-pass filter ,then extract the real part of the complex filtered signal that will be full wave rectified then To filter out high frequencies to complete envelope detection, design a second order “Butterworth” low-pass filter the problem is why after LPF the carrier frequency still exists on the signal as shown on the attached figures??

[Dafrizzy]

Hi Ashly,

Can you share your whole program, especially the settings you are using for your filters? It would be much more helpful to see the whole block diagram to understand exactly what is being plotted in those screenshots.