Excerpts from Fons Adriaensen's message of 2011-06-17 19:48:10 +0200:
Thanks for your extensive explanation Fons. I slept over it a couple of
days, hoping to understand a little better now.
> Sound consists of variations of air pressure that
I found a bit of explanation of wave propagation in one of my books, but
it seems to differ slightly. It basically takes energy and heat into
account and says (simplified) that there are basically two states, one
without motion but increased pressure and heat, one with maximum motion
and little pressure/heat, and everything in between. I guess this
corresponds to P() and V() in your explanation?
> For a real single sound source the direction of the
Towards the source? No idea whether it matters, just wondering.
> They are
Proportional or inverse proportional? Again I'm thinking of the model
from the book, with the two states of pressure and velocity. With this
in mind pressure would be large when velocity is small and vice versa.
> So given P(t),
I understand that the vector sum is different with two speakers,
however, it's somewhat hard to grasp for me that if P() and V() are
generating each other that P() can on the one hand generate proportional
V() and out-of-proportion V().
> At low frequencies (where the wavelenght is much
I guess this sort of analysis or model is used for more complex systems
like ambisonics as well?
Yes, thank you very much for your explanation. I've not fully grasped
the "whys", but I understand the idea.
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