[Discuss-gnuradio] Real-only direct-conversion

[Marcus D. Leech]

I was on a call the other night with someone who asserted that you
didn't need an I & Q representation
  for  a direct-conversion receiver, and that I and Q could be
synthesized later from a real-mode-only
  baseband signal.

I know that very-early (1940s) direct-conversion receivers didn't use I
and Q signal chains, but they were
  typically used for demodulating AM signals, where the +/- frequency
ambiguity wouldn't have been
  an issue.

So, my feeling is that you *absolutely need* the I and Q "form" in order
to disambiguate +/-
  frequencies when dealing with direct-conversion baseband signals.

Who's right?

-- 
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org