"Frank Gilliland" wrote...

I think the key word here is 'waveform', where 'form' is the issue and
scale or phase are not. Because ANY device, active or passive, will
introduce some phase delay and amplitude variation to the signal. So
be practical or be a purist, but you're both really just saying the
same thing.

What's up with you, playing peace-maker?

The difference of opinion here appears to be whether waveform
is defined by the absolute value at the peak, rather than
relative changes throughout a cycle.

In the noted references, signal amplitude does not affect
the waveform of the signal.

Considering the qualifications of these chaps, and the fact
that they each have said the same, I am somewhat reluctant
to consider their words, math and diagrams to be incorrect.


Now if you wanted to take this to a philosophical level, no two
signals can EVER be identical for the simple reason that they can
always be differentiated,

Ah, signals... fine. The term "signal" can cover everything, the
slightest change of anything (including amplitude) could be taken
as a change in the signal.

I would not argue that a larger version of a sinewave may not
be considered an identical *signal* to the smaller version, but
I would argue that the waveform property of the signal has
not changed.


if not by amplitude or phase then by
temporal location (one is the input, the other is the output) or by
physical location (you measure this one here and that one there). But
by the same rule of identity I guess that means no two opinions will
ever be identical either, so argue away.....

You act as peace-maker, then encourage us to argue?


Regards,
Peter.
http://www.citizensband.radiouk.com/