Method for suppressing interference noise in an acoustic system and acoustic system

A method for suppressing an interference noise in an acoustic system, wherein the acoustic system including at least one microphone and at least one loudspeaker, the at least one microphone generating an input signal and the at least one loudspeaker generating an acoustic signal which partially feeds back to the at least one microphone, the method comprising:

• forming a first intermediate signal along a primary signal path as a function of the input signal and forming an output signal from the first intermediate signal via a frequency distortion;
• coupling the output signal out from the primary signal path into a signal feedback path;
• forming a second intermediate signal in the signal feedback path from the output signal via a decorrelation, inputting the second intermediate signal as an input value for an adaptive filter, generating a compensation signal by the adaptive filter, and feeding the compensation signal to the input signal to form a compensated input signal;
• forming a third intermediate signal from the input signal and/or from the compensated input signal, and using the third intermediate signal as an input value for the adaptive filter;
• and
• feeding the output signal to the at least one loudspeaker for reproduction.