Darren New <dne### [at] sanrrcom> wrote:
> Orchid XP v8 wrote:
> > HDMI is a raw, unmodulated digital signal.

> There is no such thing. Digital is your imagination.

  Of course there is.

  Modulation means encoding the information into the higher frequencies of
a base carrier signal. For instance radio transmissions work that way: You
have a carrier signal at a certain base frequency, and then the sound is
encoded into it by slightly modifying its amplitude (AM) or frequency (FM).

  Modems work that way too: The bits are encoded in a similar way as
variations of a carrier signal.

  Sending a raw digital signal over a cable doesn't require modulation.
It can be as simple as "no current = 0", "current = 1". (Of course the
actual process is a bit more complicated due to synchronization problems
and such, but basically it's just that.) There's no carrier signal, hence
no modulation.

-- 
                                                          - Warp

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