Diffeomorphism algebra of a two-dimensional free massless scalar field with signature change

We study a model of free massless scalar fields on a two-dimensional cylind er with a metric that admits a change of signature from a Lorentzian to a E uclidean region. We take a long strip on the cylinder, denoted by the angle theta, as the signature-changing region and show that, using specific junc tion conditions, the energy spectrum depends on the angle a and in a sense differs from the ordinary bosonic spectrum for low energies. Moreover, the diffeomorphism algebra of the corresponding infinite conserved charges is d ifferent from 'Virasoro' algebra and approaches it at higher energies where as the central term, although modified, does not approach the central term of 'Virasoro' algebra at higher energies.