The method 2 further comprising updating trackers before determining a respective said fundamental frequency of the respective time frame, wherein {HEAD ~ said updating} of {TAIL ~ the trackers} includes at least one of: 
of
The method 2 further comprising updating trackers before determining a respective said fundamental frequency of the respective time frame , wherein { HEAD ~ said updating } of { TAIL ~ the trackers } includes at least one of :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH