
106
4
Digitization
where Γ equals A/2 for (67a) and B/2 for (67b), and where
k(s,t)
= £
0
e-
c|s
-" (71)
c being-equal to c
l
for (67a) and c
2
for (67b). We can arbitrarily set k
0
=
7^(0,0)
for both the cases.
The theoretical techniques for solving (70) with k(s, t) given by (71) can be
found in many places in the literature (see, for example, pp. 186-190 of [19]).
In Fig. 12, the bottom curve corresponds to the case in which the sampling
error was calculated by first solving (70) with k(s, t) given by (71), writing
down the corresponding solutions for (67a) and (67b), substituting these
solutions and their corresponding eigenvalues in (68) and