"William Sommerwerck"

"Phase" implies a relative-timing relationship.

** The term " phase shift " generally has that implication - but not the
term " phase " alone.

Simply inverting polarity doesn't change the timing between the two
waveforms.

** Irrelevant - see above.

In any case, for continuous sinewaves a 180 degree phase shift and signal
polarity inversion are completely indistinguishable.



..... Phil