I may regret chiming in, but digital does not necessarily
represent numbers.... it represents bits, which can be
configured (depending upon the application) to be numbers,
pixels, etc.
RTTY is merely 5 bits instead of 7 or 8. It is considered
digital because the bits shift. Thus CW, which is a two
bit code, if you will is digital from that point of view.
Phil - N8PS
----------
Quoting Bill Turner <dezrat@copper.net>:
> ORIGINAL MESSAGE:
>
> On Sat, 14 Oct 2006 19:52:25 -0400, "Joe Subich, W4TV"
> <w4tv@subich.com> wrote:
>
> >If you want to split hairs, no signal that is transmitted by RF
> >(or light in fiber optics) is truly "digital."
>
> ------------ REPLY FOLLOWS ------------
>
> For a signal to be "digital", the data has to represent numbers. That
> is what the word "digital" means. In the case of RTTY, the bits are
> purely analog signals, which is why they can be decoded with an analog
> computer, namely a teletype machine. There is no number crunching
> involved. You can, of course, digitize the signal just as with any
> analog signal and process it, but the original signal was and is
> analog.
>
> I realize I'm pi**ing into the wind here. People who don't really
> think about things will lump any on-off signal into the "digital"
> category whether it really is or not.
>
> One last example: Your house probably has switches on the wall which
> turn a ceiling light on and off. Is that a digital switch? Or just a
> two-state, i.e. binary, switch? If you believe it is digital, then you
> will believe RTTY is a digital mode.
>
> Bill, W6WRT
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