Another kind of Phasing

[Magnus Danielson]

>>>>> "LH" == Larry Hendry <jlarryh at iquest.net> writes:

 LH> Sorry, after reading 8 different post of a different kind of phasing, my
 LH> brain would not permit me to sleep without inserting yet another kind of
 LH> "phasing" that I work with on a regular basis.

 LH> Did you know that the phase of an AC signal can be retarded by simply
 LH> loading a highly inductive conductor?  If the signal end is viewed as the
 LH> source of energy, and the end of the circuit as some load, then as the
 LH> signal applies torque to one end of the inductor the load will retard the
 LH> effective phase angle at the load end.

 LH> I say this having absolutely no idea if this "concept" has a place in an
 LH> electronic circuit.  However, in the power industry (where I work) this
 LH> phase shifting of the AC signal due to load across the delivery system is
 LH> easily seen.  The transmission lines act more inductively as power is
 LH> transmitted across them (increasing the EMF feild).  So, the more torque
 LH> applied at one end to equalize load at the other end will cause a shift in
 LH> the relative phase angle between the opposite ends.  I have seen this phase
 LH> shift in excess of 30 degrees.  Once the load (current in phase with
 LH> voltage) is removed, the phase angle at the opposite ends is almost exactly
 LH> the same.

In the power industry you for once cares about *power* and how to be
nice as you go along and use it. I have seen too few people caring
about it in the audio industry, rather the opposite... 

One must also understand that the power industry usually work under
diffrent conditions as to the audio things like 3-phase and a (almost)
fixed line frequency creates a diffrent environment along with other
things. When did you last see a 3-phase audio transmission????

Just think about it, 3-phase audio... maybe something new for those
"HiFi" people going for Dolby Suround sound and Monster Cables at home...

Phase is a much more important issue for the power industry than the
audio for which phase is almost a forgotten concept. All this "flat
frequency response" talk is just half the story in my experience.

 LH> Food for thought, or what the heck, just throw tomatoes for such an off
 LH> topic post.

The inductor trick may not be usefull as such, but the consideration
of phase is. Once you considered phase responce, frequency respons and
polarity things like impulse responses becomes quite interesting.

Cheers,
Magnus