sentences:  Reassignment method
  
  The method of reassignment is a technique for
  sharpening a time-frequency representation by mapping
  the data to time-frequency coordinates that are nearer to
  the true region of support of the
  analyzed signal.The method has been independently
  introduced by several parties under various names, including
  "method of reassignment", "remapping", "time-frequency reassignment", 
  and "modified moving-window method".