Pseudo-random binary sequency generator

Abstract

A pseudo-random binary address generator is described which is designed for supplying addresses of cutting points of video signals for the purpose of encoding these signals by rotation of the two segments situated on either side of each cutting point, comprising three feedback registers (A), (B), (C) whose generating polynomials are irreducible and primitive, and in which the numbers of cells are different. These registers comprise several outputs a.sub.i b.sub.j c.sub.k, and the addresses of the cutting points are sums of N terms of weight 2.sup.O to 2.sup.N-1 and of coefficients S.sub.O to S.sub.N-1 of which at least a certain number are deduced from logic equations combining the outputs a.sub.i b.sub.j c.sub.k. At regular intervals a synchronization pulse (SP) reloads in the registers (A), (B), (C) three initial words which, placed end to end, constitute the decoding key, stored in a fourth register (D) with three taps to which, for their reloading, the three registers (A), (B), (C) are momentarily connected.