Patent ID: 7316162

Claim:
A method of determining, in a predefined target position, a sound pressure (Δp) resulting from sound emitted from a surface element (ΔS) of a sound emitting surface (S), the method comprising: measuring, using a three-dimensional array of a plurality of microphones arranged in a first predefined measuring position relative to the surface element (ΔS), a first three-dimensional distribution of sound pressure; calculating, based on the first three-dimensional distribution of sound pressure, an air-particle velocity (u n ) on the surface element (ΔS) and perpendicular to the surface element (ΔS), resulting from the sound emitted from the surface (S); arranging a sound source capable of emitting a volume velocity (Q v ) in the target position; causing the sound source to emit the volume velocity (Q v ); measuring, using a three-dimensional array of a plurality of microphones arranged in a second predefined measuring position relative to the surface element (ΔS) and with the volume velocity (Q v ) emitted from the sound source in the target position creating a dominating sound, a second three-dimensional distribution of sound pressure; calculating, based on the second three-dimensional distribution of sound pressure, a sound pressure (p V ) at the surface element (ΔS) resulting from the volume velocity (Q v ) emitted from the sound source in the target position; determining a transfer function H=p v /Q v as the ratio of the sound pressure (p v ) at the surface element (ΔS) to the volume velocity (Q v ) emitted from the sound source in the target position; and determining the sound pressure (Δp) in the target position as Δp=H·(u n ·ΔS).