Arrangement for suppressing aninterfering component of an input signal
AssigneeKoninklijke Philips Electronics N.V.
InventorCORNELIS P. JANSE
Life of this patent
Estimating the term…
Abstract
In an acoustic echocanceller (6), an estimate of an echo signal is determined by an adaptive filter (10) and is subtracted from the input signal by a subtracter (14). The spectrum estimator (12) determines the frequency spectrum of the estimate of the echo signal, and the filter (16) filters the output signal of the subtracter (14) with a filter having a transfer function dependent on the spectrum determined by the estimator (12). The use of this combination results in a substantial improvement of the suppression of the echo signal.
Claims6
Arrangement for suppressing an interfering component in an input signal, said arrangement comprises means for deriving an estimate of the interfering component, subtraction means for determining a difference signal from the input signal and the estimate of the interfering component, characterised in that the arrangement comprises means for determining an estimate for the frequency spectrum of the interfering component, and in that the arrangement comprises a filter having a reduced transfer function for at least one frequency range in dependence on the frequency spectrum of the interfering component.
Arrangement according to one of the previous claims, characterised in that the filter has a transfer function having an absolute value dependent on the difference of the amplitude of the frequency of the frequency spectrum of the input signal and the amplitude of the frequency spectrum of the estimate of the interfering component.
Dependencies are inferred from the claim text.