A method for enhancing an audio signal, in particular in real time, the method comprising at least the following steps: - Receiving an audio signal having multiple amplitude values, the audio signal having speech at least in sections; - Detecting speech sections of the audio signal (18, 24); - filtering the audio signal with at least one level filter to reduce signal level variations of the audio signal in the detected speech portions; - determining a feedback frequency representing a feedback of the audio signal; - filtering the audio signal with a feedback filter based on the determined feedback frequency to reduce spectral components of the audio signal representing feedback; and - filtering the audio signal with at least one equalization filter to reduce spectral variations of the audio signal in the detected speech portions, the filtering with the at least one equalization filter comprising: - determining coarse spectral values based on fine spectral values of the audio signal, wherein the coarse spectral values represent the fine spectral values at a lower spectral resolution than the fine spectral values; - determining first equalization weights representing a deviation of the coarse spectral values from predetermined reference spectral values; - weighting the audio signal with the first equalization weights to bring spectral values of the audio signal into agreement with the reference spectral values; wherein determining the feedback frequency comprises: - Determining a subset of spectral values of the audio signal that violate a predetermined spectral threshold; - determining a plurality of first spectral parameter values based on the subset, each of the first spectral parameter values representing a predetermined relationship between an associated spectral value of the subset and at least one temporally and/or spectrally adjacent spectral value; and - determining the feedback frequency based on the plurality of first spectral parameter values (78, 80, 82, 84). - Receiving an audio signal having multiple amplitude values, the audio signal having speech at least in sections; - Detecting speech sections of the audio signal (18, 24); - filtering the audio signal with at least one level filter to reduce signal level variations of the audio signal in the detected speech portions; - determining a feedback frequency representing a feedback of the audio signal; - filtering the audio signal with a feedback filter based on the determined feedback frequency to reduce spectral components of the audio signal representing feedback; and - filtering the audio signal with at least one equalization filter to reduce spectral variations of the audio signal in the detected speech portions, the filtering with the at least one equalization filter comprising: - determining coarse spectral values based on fine spectral values of the audio signal, wherein the coarse spectral values represent the fine spectral values at a lower spectral resolution than the fine spectral values; - determining first equalization weights representing a deviation of the coarse spectral values from predetermined reference spectral values; - weighting the audio signal with the first equalization weights to bring spectral values of the audio signal into agreement with the reference spectral values; - determining coarse spectral values based on fine spectral values of the audio signal, wherein the coarse spectral values represent the fine spectral values at a lower spectral resolution than the fine spectral values; - determining first equalization weights representing a deviation of the coarse spectral values from predetermined reference spectral values; - weighting the audio signal with the first equalization weights to bring spectral values of the audio signal into agreement with the reference spectral values; - Determining a subset of spectral values of the audio signal that violate a predetermined spectral threshold; - determining a plurality of first spectral parameter values based on the subset, each of the first spectral parameter values representing a predetermined relationship between an associated spectral value of the subset and at least one temporally and/or spectrally adjacent spectral value; and - determining the feedback frequency based on the plurality of first spectral parameter values (78, 80, 82, 84).