SONGetusPerTime

  SONGETUSPERTIME returns the tick interval in units of SONTimeBase()
  USPERTIME=SONGETUSPERTIME(FH)
                          FH SON file handle

  See also SONGETTIMEPERADC, SONCHANDIVIDE
  Author:Malcolm Lidierth
  Matlab SON library:
  Copyright © The Author & King's College London 2005-2006