  Three problems about recovery of a high-frequency free term in the
one-dimension wave equation with homogeneous initial-boundary conditions by
some information about partial asymptotics of its solution have been solved. It
is shoun, that the free term can be completely recovered from a specific data
about incomplete (three-terms) asymptotics of the solution. Before formulation
of the each problem about recovery of free term, construction and justification
of the asymptotics of the solution of original initial-boundary problem are
given.
