  Magnetoelectric, dielectric and magnetic susceptibility tensors of
multiferroic TbMnO3 with cycloidal antiferromagnetic structure in external
electric and magnetic fields have been investigated with taking into account
dynamics of spin, electro-dipole and acoustic subsystems. All components of
tensors depend on values of external electric and magnetic fields. The
possibility of control of electrodynamic properties of multiferroic TbMnO3 with
cycloidal antiferromagnetic structure by external electric and magnetic fields
has been shown. The resonant interaction of spin, electro-dipole,
electromagnetic and acoustic waves in such material is observed.
