In a listening device such as for example a hearing aid where an input signal is received by a microphone , converted from analog to digital , digitally processed including {HEAD ~ a conversion} from {TAIL ~ a time domain} into a frequency domain, converted from digital to analog and transmitted to a user by means of a loudspeaker , the internal digital processing generates an unwanted noise signal, the so called undesired periodic noise , at specific frequencies 
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In a listening device such as for example a hearing aid where an input signal is received by a microphone , converted from analog to digital , digitally processed including { HEAD ~ a conversion } from { TAIL ~ a time domain } into a frequency domain , converted from digital to analog and transmitted to a user by means of a loudspeaker , the internal digital processing generates an unwanted noise signal , the so called undesired periodic noise , at specific frequencies
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