the frequency divider/counter comprising a commutable pre-divider, e.g. a two modulus divider

Full Title

Automatic control of frequency or phase; Synchronisation > using a reference signal applied to a frequency- or phase-locked loop > Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop > using a frequency divider or counter in the loop (H03L7/20, H03L7/22 take precedence) > a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number > the frequency divider/counter comprising a commutable pre-divider, e.g. a two modulus divider