Patent ID: 8731851

Claim:
A method of reconstructing a sound field at at least one target location, the sound field being generated by at least one sound source, the method comprising: receiving, at an interface circuit, one or more measured values of a first acoustic quantity measured at a set of measurement locations; defining, by a computer, a set of virtual source locations and a set of wave functions each representative of a respective sound field originating from a respective one of the defined set of virtual source locations; wherein the defining comprises (a) defining a respective scaling surface for each of the defined virtual source locations, the scaling surface being located outside a first source-free region, and (b) scaling each of the set of wave functions to each have a predetermined amplitude on the scaling surface associated with the virtual source location; computing, by the computer, a second acoustic quantity for at least one target location from a superposition of the set of scaled wave functions multiplied by respective expansion coefficients, the measurement locations and the at least one target location being located in the first source-free region, and the virtual source locations being located outside the first source-free region; and storing the second acoustic quantity in a memory.