A method of operating a hearing aid system (100, 200) comprising the steps of: - providing a digital input signal representing the output from an input transducer of the hearing aid system, - selecting a first window function, - selecting a first length of the first window function, - providing a second window function by zero padding the first window function such that the second window function has a second length, wherein the second length is larger than the first length, - applying the second window function to the digital input signal and using a discrete Fourier transform to calculate a first time-frequency-distribution at a first point in time for the digital input signal, CHARACTERIZED BY - determining a first value of a measure of the energy in the digital input signal at a subsequent second point in time, - applying the second window function to the digital input signal and using a discrete Fourier transform to calculate a second time-frequency-distribution at said subsequent second point in time, - evaluating the first value of the measure of the energy in the digital input signal at the second point in time to obtain a result in order to determine an adaptive time-frequency bin having a specific frequency index, - in response to a first result of said evaluation, using as the adaptive time-frequency bin a time-frequency bin of the second time-frequency distribution, - in response to a second result of said evaluation, applying a phase shift, corresponding to the time shift between the first and subsequent second point in time, to a frequency bin of the first time-frequency-distribution hereby providing a phase shifted time-frequency bin, and adding said phase shifted time-frequency bin to a frequency bin of the second time-frequency-distribution having the same frequency index, hereby providing the adaptive time-frequency bin, - deriving a gain value for the hearing aid system based on said adaptive time-frequency bin, - applying said gain value to a signal in a primary signal path of the hearing aid system in order to suppress noise, said primary signal path including at least the hearing aid system input transducer and the hearing aid system output transducer. - providing a digital input signal representing the output from an input transducer of the hearing aid system, - selecting a first window function, - selecting a first length of the first window function, - providing a second window function by zero padding the first window function such that the second window function has a second length, wherein the second length is larger than the first length, - applying the second window function to the digital input signal and using a discrete Fourier transform to calculate a first time-frequency-distribution at a first point in time for the digital input signal, CHARACTERIZED BY - determining a first value of a measure of the energy in the digital input signal at a subsequent second point in time, - applying the second window function to the digital input signal and using a discrete Fourier transform to calculate a second time-frequency-distribution at said subsequent second point in time, - evaluating the first value of the measure of the energy in the digital input signal at the second point in time to obtain a result in order to determine an adaptive time-frequency bin having a specific frequency index, - in response to a first result of said evaluation, using as the adaptive time-frequency bin a time-frequency bin of the second time-frequency distribution, - in response to a second result of said evaluation, applying a phase shift, corresponding to the time shift between the first and subsequent second point in time, to a frequency bin of the first time-frequency-distribution hereby providing a phase shifted time-frequency bin, and adding said phase shifted time-frequency bin to a frequency bin of the second time-frequency-distribution having the same frequency index, hereby providing the adaptive time-frequency bin, - deriving a gain value for the hearing aid system based on said adaptive time-frequency bin, - applying said gain value to a signal in a primary signal path of the hearing aid system in order to suppress noise, said primary signal path including at least the hearing aid system input transducer and the hearing aid system output transducer.