Applications of plane-wave destruction filtersa

Fomel 30 Plane-wave destructors
b 0 =
b 1 =
(2 + σ)(2 − σ)
6
(1 + σ)(2 + σ)
12
; (A-8)
. (A-9)
The B 5 filter of equation (10) is constructed in a completely analogous way, using
longer Taylor expansions to constrain the additional coefficients. Generalization to
longer filters is straightforward.
The technique of this appendix aims at matching the filter responses at low frequencies.
One might construct different filter families by employing other criteria for
filter design (least squares fit, equiripple, etc.)
SEP–105