Patent ID: 7817804

Claim:
A method for implementing a system for locating noise sources and measuring their intensity, the system comprising a plurality of microphones oriented in several directions and mounted in a support so that each one is flush with or disposed on a rigid surface, the microphones being connected to a signal processing device that processes the signals coming from the microphones to provide a noise source hologram, the noise source hologram being a distribution of the acoustic pressures or intensities at various points on a given surface, the method comprising: positioning the support of the microphones in an enclosure, where three-dimensional coordinates of each microphone are known, to measure noise sources on a surface; performing focusing operations sequentially at various focusing points of the surface, coordinates of which are known; for each point and at each frequency, calculating a sound level from a pressure according to the formula: P ⁡ ( x , y , z ) = ∑ A i ⁢ P i ⁡ ( t - r i c ) ⁢ xHrtf where: P=calculation results at a point x, y, z of the hologram, P i =pressure measured by a microphone i, r i =distance between the microphone i and the calculation point, A i =coefficient, and Hrtf=transfer function of a rigid body, for a given microphone and a given focusing point (x, y, z), taking into account a nature, a shape, and a size of the support; and establishing a hologram from the calculations results for the various focusing points.