| jimp@specsol.spam.sux.com 2007-06-27, 5:25 pm |
| In sci.physics.electromag Paul Cardinale <pcardinale@volcanomail.com> wrote:
> On Jun 26, 9:25 pm, j...@specsol.spam.sux.com wrote:
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> I answered it. Reread.
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> Voltage.
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> If changes in parameter X of thing A cause analogous changes to
> parameter Y of thing B,
> then the X of A is modulating the Y of B. In the case of TTL, binary
> data modulates DC voltage.
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> You seem to think that all modulation must be based upon amplitude
> modulation of a sine wave. It isn't (see above). As for an equation
> for TTL, it's trivial: Voltage = (high_level) * (binary data).
Umm, no.
You might want to look up what "e.g." means.
Would you have been happier if I had said "e.g. FM is
x(t) = xc * cos [wc * t + {b * sin (wm * t)}]"?
So is your trivial equation in the time domain or the frequency
domain as I see neither a time nor a frequency component in it?
Or should I perhaps just look under "voltage modulation" in the
IEEE Dictionary?
--
Jim Pennino
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