[e) 
oN 
ayaa 
B N 
W 
) 
9 or X 
rora 
Gan Be) 
w 
a> de> ds 
Soy Ue 
ni 
sound pressure at a distance p from 
the source 
wave length of sound with velocity ec 
wave number 
se) = Aner 
density of the medium 
angle measured in the x-y plane from 
the x-axis in a counterclockwise direction 
radius of a circle 
polar coordinates of the see element 
separation between consecutive 
elements) inthe 2-2 Yar dire cLion 
respectively 
substitution variables, defined 
where used in the text 
rectangular coordinate system; the 
coordinate system whose origin is 
the sound source and such that the 
positive € -axis contains the line 
segment from the origin of the array 
to the sound source 
