Pcm switching network providing interleaving of outgoing and incoming samples to a store during each time slot

Claim 1

A coded signal switching network comprising incoming multiplex groups constituted by time channels to which are assigned recurrent channel time slots, similar outgoing multiplex groups, at least one speech store constituted by addressable memory cells each provided for recording at least one coded signal combination, an incoming switch enabling the selective connection of the speech store to one of the incoming groups, an outgoing switch enabling the selective connection of the speech store to one of the outgoing groups, a read address source, an outgoing group address source, an incoming group address source and a write address source, characterized in that the synchronism between the different address sources is such that: in the course of a first channel time slot, the read address source supplies the store with the address of the memory cell to be read and the read operatIon takes place; in the course of a second channel time slot, subsequent to the first one, the outgoing group address source supplies the outgoing switch with the address of the concerned outgoing group and the coded combination read-out is transmitted on the outgoing group; in the course of a third channel time slot, the incoming group address source supplies the incoming switch with the address of the concerned incoming group; in the course of a fourth channel time slot, subsequent both to the first and the third ones, the write address source supplies the store with the address of the memory cell previously read-out and the coded combination originated from the incoming group is stored in said cell; whereby it is possible to use efficiently the switches and the store.