A generator of repetitive sets of spreading sequences comprising element, for counting and for forming an address and a table containing L sets of S sequences, wherein the address contains q=1+log2S bits, in which one set among L sets is selected and wherein the log2S bits select one sequence among the S sequences in the set. The invention also relates to a process for producing such granules. In one application in an adaptive optics system, the membrane mirror is used in a wavefront sensor.