An apparatus for extracting an ambient signal on the basis of a time-frequency-domain representation of an input audio signal, the time-frequency-domain representation representing the input audio signal in terms of a plurality of sub-band signals describing a plurality of frequency bands, the apparatus comprising: a gain-value determinator configured to determine a sequence of time-varying ambient signal gain-values for a given frequency band of the time-frequency-domain representation of the input audio signal in dependence on the input audio signal; a weighter configured to weight one of the sub-band signals representing the given frequency band of the time-frequency-domain representation with the time-varying ambient signal gain-values, to obtain a weighted sub-band signal; wherein the gain value determinator is configured to obtain a plurality of different quantitative feature values describing a plurality of different features or characteristics of the input audio signal and to provide the ambient signal gain values as a function of the plurality of different quantitative feature values, such that the ambient signal gain values are quantitatively dependent on the quantitative feature values, to allow for a fine-tuned extraction of the ambient components from the input audio signal; and wherein the gain value determinator is configured to provide the ambient signal gain values such that ambience components are emphasized over non-ambience components in the weighted sub-band signal; wherein the gain value determinator is configured to combine the different quantitative feature values to obtain the sequence of time-varying ambient signal gain values such that the ambient signal gain-values are quantitatively dependent on the quantitative feature values; wherein the gain value determinator is configured to weight the different quantitative feature values differently according to weighting coefficients, wherein the weighting coefficients are chosen such that an extraction of an ambient signal is achieved; and wherein the gain value determinator is configured to combine at least a tonality feature value describing a tonality of the input audio signal and an energy feature value describing an energy within a sub-band of the input audio signal, to obtain the ambient signal gain values. a gain-value determinator configured to determine a sequence of time-varying ambient signal gain-values for a given frequency band of the time-frequency-domain representation of the input audio signal in dependence on the input audio signal; a weighter configured to weight one of the sub-band signals representing the given frequency band of the time-frequency-domain representation with the time-varying ambient signal gain-values, to obtain a weighted sub-band signal; wherein the gain value determinator is configured to obtain a plurality of different quantitative feature values describing a plurality of different features or characteristics of the input audio signal and to provide the ambient signal gain values as a function of the plurality of different quantitative feature values, such that the ambient signal gain values are quantitatively dependent on the quantitative feature values, to allow for a fine-tuned extraction of the ambient components from the input audio signal; and wherein the gain value determinator is configured to provide the ambient signal gain values such that ambience components are emphasized over non-ambience components in the weighted sub-band signal; wherein the gain value determinator is configured to combine the different quantitative feature values to obtain the sequence of time-varying ambient signal gain values such that the ambient signal gain-values are quantitatively dependent on the quantitative feature values; wherein the gain value determinator is configured to weight the different quantitative feature values differently according to weighting coefficients, wherein the weighting coefficients are chosen such that an extraction of an ambient signal is achieved; and wherein the gain value determinator is configured to combine at least a tonality feature value describing a tonality of the input audio signal and an energy feature value describing an energy within a sub-band of the input audio signal, to obtain the ambient signal gain values.