An interesting approach to dispersion compensation is based on
*frequency-warping* the signals going into the mesh
[402]. Frequency warping can be used to compensate
frequency-dependent dispersion, but it does not address
angle-dependent dispersion. Therefore, frequency-warping is used in
conjunction with an isotropic mesh.

The 3D waveguide mesh
[520,523,402] has
been used for efficient simulation of acoustic spaces
[399,183]. It has also been applied to
statistical modeling of violin body resonators in
[204,203,426,432], in
which the digital waveguide mesh was used to efficiently model only
the ``reverberant'' aspects of a violin body's impulse response in
statistically matched fashion (but close to perceptually equivalent).
The ``instantaneous'' filtering by the violin body is therefore
modeled using a separate equalizer capturing the important
low-frequency body and air modes explicitly.
A unified view of the digital waveguide mesh and
*wave digital filters* (§F.1)
as particular classes of energy invariant finite difference schemes
(Appendix D) appears in
[54].
The problem of modeling diffusion at a mesh boundary was addressed in
[270], and maximally diffusing boundaries, using quadratic
residue sequences, was investigated in [281]; an introduction
to this topic is given in §C.14.6 below.

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