A system for generating timing pulses proportional to the square root of the elapsed number of linear clock pulses employs a reference counter and a linear clock counter, the latter of which counts pulses from a linear clock. A comparator compares the counts in the counters and emits an output pulse when the two counts are the same. In response to successive output pulses from the comparator, the count in the reference counter increases by successive odd numbers and the linear clock counter recounts pulses from the linear clock until its count again equals that in the reference register, so that the successive pulses from the comparator are spaced from their predecessors by a uniformly increasing odd number of linear clock pulses.