Patent ID: 7020291
Filing Date: 2006-03-28
Classification: G10L

Abstract:
1. A noise reduction method in which a reference signal of the interference is produced for multi-channel interference compensation systems, the method comprising the steps of: reducing interference of a useful signal in a first channel via a spectral subtraction so as to define a reduced-interference signal, the useful signal also being carried in a second channel; forming an interference reference signal by subtracting the reduced-interference signal from the useful signal in the second channel; applying the interference reference signal to an adaptive filter so as to define a first reference signal connecting the first channel and the second channel in an array so as to form a primary signal, the array being one of a differential array and a sum-and-difference array; performing a further spectral subtraction on the useful signal of the second channel so as to define a spectral subtracted signal; forming a second reference signal as a function of the useful signal from the first channel and the spectral subtracted signal, the second reference signal being applied to a second adaptive filter in a third channel, and subtracting the first and second reference signals from the primary signal.