Method of searching for a model of noise in the sound signals noisy

摘要

The invention mainly concerns noise reduction of sound signals in a noisy environment, for example in an aircraft pilot's cockpit or any other vehicle, and more precisely it concerns the search for a noise model in sound signals. The method consists in digitising the input signals and processing these signals from a noise model in order to eliminate as far as possible the noise corresponding to the model. The input signals are strobed in successive patterns of P samples each, and an iterative search of a noise model is permanently carried out in the input signals themselves, searching N successive patterns (N ranging between a minimum N1 and a maximum N2) having the expected characteristics of a noise, by storing the NxP corresponding samples to constitute a noise model useful for the noise reduction processing of the input signals, and by repeating the search to find a new noise model and storing the new noise model to replace the previous one or keeping the previous one according to the respective characteristics of the two models. The model is obtained by finding N patterns whereof the energy contents are close to one another (the energy contents ratio being between two values S and 1/S).