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![]() | Omnidirectional plane-wave destruction | ![]() |
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The above maxflat condition is a linear system
with
unknown variables
.
In order to obtain a non-zero solution,
we use only the first
equations,
which zeros the partial derivatives
with order less than
,
and impose an additional constraint on the filter coefficients,
This additional constraint yields a unit amplitude response at zero frequency, similarly to the 1D maxflat approximation (Chen et al., 2013).