Acoustic feedback suppression

摘要

A device ( 1 ) for acoustic feedback compensation comprises an adaptive filter ( 4 ), an adjustment unit ( 5 ) for adjusting coefficients of the adaptive filter, a combination unit ( 3 ) for subtracting an adaptive filter signal from an input signal so as to produce a residual signal, and a noise unit ( 8 ) for producing a noise signal. The noise unit ( 8 ) is arranged for producing masked noise on the basis of the residual signal, a noise signal having a frequency spectrum controlled by the residual signal. An auditory masking model may be used to shape the noise spectrum. The noise signal may have a smaller amplitude than the residual signal at frequencies where the residual signal has a relatively large amplitude, and a larger amplitude than the residual signal at some frequencies where the residual signal has a relatively small amplitude.