converting the digital input signal from a time domain into a frequency domain includes determining a complex transformation value, where said noise signal is, for each determined frequency band, filtered out of said complex transformation value by subtracting a first correction value from a real part of said complex transformation value to obtain a corrected real value and by subtracting a second correction value from {HEAD ~ an imaginary part} of {TAIL ~ said complex transformation value} to obtain a corrected imaginary value, and 
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converting the digital input signal from a time domain into a frequency domain includes determining a complex transformation value , where said noise signal is , for each determined frequency band , filtered out of said complex transformation value by subtracting a first correction value from a real part of said complex transformation value to obtain a corrected real value and by subtracting a second correction value from { HEAD ~ an imaginary part } of { TAIL ~ said complex transformation value } to obtain a corrected imaginary value , and
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