method and apparatus for sealing telephone, long-distance circuits, in currents carrying systems

摘要

the invention refers to a method that allows simultaneous sealing of a number eight telephone channels, from a group of primary currents carrying systems.by mixing signals in time of the eight horses, after a law pseudoaleatorie, and transmission, on each channel, a combined signal, the result of the mixture.the function controlled by microprocessor comprises blocks of signal processing by the predetermined pseudoaleatorie, tactfully, synchronized with blocks of recoveryaccordingly, at the reception.