A noise estimator for generating an overall noise estimate for an audio signal, wherein the noise estimator comprises microphones for capturing sounds, the sounds are represented by a plurality of audio signals comprising the audio signal, each of the plurality of audio signals is formed, at least partly, by a noise signal and comprises a plurality of spectral components, and wherein the overall noise estimate comprises, for each spectral component in the audio signal, a respective spectral noise estimate, the noise estimator comprising: an estimator configured to generate the overall noise estimate by: applying a first estimation technique to the audio signal to generate spectral noise estimates for spectral components of the audio signal that are below a cut-off frequency; applying a different second estimation technique to the audio signal to generate, based on the plurality of audio signals, spectral noise estimates for spectral components of the audio signal that are above the cut-off frequency; and forming the overall noise estimate to comprise, for spectral components below the cut-off frequency, the spectral noise estimates generated using the first estimation technique and, for spectral components above the cut-off frequency, the spectral noise estimates generated using the second estimation technique; characterized by an adaptation unit configured to adjust the cut-off frequency so as to account for changes in coherence of the noise signal that are reflected in the audio signal, wherein the adaptation unit is configured to select the cut-off frequency to be the lowest frequency at which one of the plurality of audio signals shows a predetermined degree of coherence with another of the plurality of audio signals. an estimator configured to generate the overall noise estimate by: applying a first estimation technique to the audio signal to generate spectral noise estimates for spectral components of the audio signal that are below a cut-off frequency; applying a different second estimation technique to the audio signal to generate, based on the plurality of audio signals, spectral noise estimates for spectral components of the audio signal that are above the cut-off frequency; and forming the overall noise estimate to comprise, for spectral components below the cut-off frequency, the spectral noise estimates generated using the first estimation technique and, for spectral components above the cut-off frequency, the spectral noise estimates generated using the second estimation technique; characterized by an adaptation unit configured to adjust the cut-off frequency so as to account for changes in coherence of the noise signal that are reflected in the audio signal, wherein the adaptation unit is configured to select the cut-off frequency to be the lowest frequency at which one of the plurality of audio signals shows a predetermined degree of coherence with another of the plurality of audio signals. applying a first estimation technique to the audio signal to generate spectral noise estimates for spectral components of the audio signal that are below a cut-off frequency; applying a different second estimation technique to the audio signal to generate, based on the plurality of audio signals, spectral noise estimates for spectral components of the audio signal that are above the cut-off frequency; and forming the overall noise estimate to comprise, for spectral components below the cut-off frequency, the spectral noise estimates generated using the first estimation technique and, for spectral components above the cut-off frequency, the spectral noise estimates generated using the second estimation technique; characterized by an adaptation unit configured to adjust the cut-off frequency so as to account for changes in coherence of the noise signal that are reflected in the audio signal, wherein the adaptation unit is configured to select the cut-off frequency to be the lowest frequency at which one of the plurality of audio signals shows a predetermined degree of coherence with another of the plurality of audio signals.