I'm trying to demodulate AM (I know there are existing blocks to do that, but I'd like to learn how to do it on my own). In a real world analog circuit, I would find the envelope by first rectifying the signal (using a diode), and then using a low pass filter - that would give me the envelope. How can I rectify with GNU Radio?
on 2013-11-17 20:02
on 2013-11-17 20:26
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on 2013-11-17 20:54
I see. For those of us who have some background in analog circuits, is there a way to work with real valued passband signals? For example, is there a block which takes a complex baseband signal and converts it to a real valued passband signal?
on 2013-11-17 22:17
On Sun, Nov 17, 2013 at 2:53 PM, Robert James <firstname.lastname@example.org> wrote: > I see. For those of us who have some background in analog circuits, > is there a way to work with real valued passband signals? For example, > is there a block which takes a complex baseband signal and converts it > to a real valued passband signal? You can always go through a type converter block "complex to float" which outputs a stream for the real and (if connected) the imaginary. Or you can just use the "complex to real" block to just get the real part. However, and I'm not trying to be glib or insulting, the best thing to do is really to understand how to work at complex baseband. When working with software radio, we're not just doing in software what we did in analog circuits. Sometimes we do, sometimes it looks similar, but by working in the digital domain, we're changing a lot about how we work with signals. In many ways, we're now able to more accurately represent the real mathematics of signal processing where we were only approximating it in hardware. Tom