In a listening device such as for example a hearing aid where an input signal is received by {TAIL ~ a microphone} , converted from analog to digital , digitally processed including a conversion from a time domain into {HEAD ~ 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 
In a listening device such as for example a hearing aid where an input signal is received by { TAIL ~ a microphone } , converted from analog to digital , digitally processed including a conversion from a time domain into { HEAD ~ 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
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH