Patent ID: 8731207

Claim:
An apparatus for computing filter coefficients for a suppression filter for filtering a first audio signal to suppress an echo based on a second audio signal, comprising: a computer comprising a value determiner programmed to determine at least one energy-related value for a band-pass signal of at least two temporally successive data blocks of at least one signal of a group of signals, the group of signals comprising the first audio signal, the second audio signal and a signal derived from the first audio signal or the second audio signal; wherein the computer further comprises a mean value determiner programmed to determine at least one mean value of the at least one determined energy-related value for the band-pass signal; wherein the computer further comprises a modifier programmed to modify the at least one energy-related value for the band-pass signal on the basis of the determined mean value for the band-pass signal; wherein the computer further comprises a filter coefficient computer programmed to compute the filter coefficients for the suppression filter on the basis of the at least one modified energy-related value for the band-pass signal; and wherein the value determiner is programmed so that the energy-related value is proportional to a power of a value of the band-pass signal with a positive, integer exponent, or wherein the value determiner is programmed so that the energy-related value is proportional to a power of a magnitude of the value of the band-pass signal with a positive real number as exponent of the power.