a time difference being used for locking the loop, the counter counting between numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division

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 numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division

Child Classifications

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• H03L 7/1972
• H03L 7/1974
• H03L 7/199 with reset of the frequency divider or the counter, e.g. for assuring initial synchronisation