Tuesday, November 3, 2020

Re: explaining i/q

-----BEGIN PGP PUBLIC KEY BLOCK-----
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=IXPf
-----END PGP PUBLIC KEY BLOCK-----
Like I said previously:

Think of the spinning dancer illusion. It works because you only see
from one vantage point. If you saw a real doll spinning, and assuming
you have two eyes and normal binocular vision, you will have parallax,
and that will allow you to determine in reality which way the figure is
spinning, because each eye will have a different view of what is going
on, and so can work out what direction the figure is spinning in.

I/Q is like that - it allows the SDR to see have "parallax" - to have 2
points of view on the signal at the same time, and so it can "see" which
way the signal is rotating - whether the signal is spinning clockwise
(negative frequencies, cause math) or counter-clockwise (positive
frequencies).

There - no advanced math, short, and yet accurate.

No comments:

Post a Comment