Abstract
A new diffraction principle formulated by assuming a hypothetical observer at a point of interest in the sound field and considering the wave propagation in a space seen by the observer virtually is proposed in this paper. This new approach allows one to grasp a simple concept of diffraction by solid obstacles and to formulate the representation of diffracted waves that satisfies both the wave equation and hard or soft boundary conditions. Thus the diffraction problem for the scalar wave equation is solved in principle by this approach. Heuristic derivation of the new principle of diffraction, followed by the theoretical analysis, is presented and the meaning and limitation of the conventional representations of diffracted waves are analyzed in the light of the new principle.
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