The invention further relates to {HEAD ~ a corresponding processing device} and {TAIL ~ a listening device} with such a processing device 
The invention further relates to { HEAD ~ a corresponding processing device } and { TAIL ~ a listening device } with such a processing device
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH