Method of communicating digital signals and receiver for use with such method

Abstract From the Canadian patent

A receiver for selectively extracting one of two or more time division multiplexed channels of digital signals, which channel has been scrambled before multiplexing using a predetermined digital sequence comprising - a clock means arranged to provide clock pulses having a repetition rate dependent on a clock control signal; a digital sequence generator triggered by each clock pulse to provide a generator signal representative of the next digit in the predetermined digital sequence; a sampling means arranged to provide a sampled signal the clock pulse rate; and a phase lock means controlling the clock control signal whereby the generator sequence is delay - lockable to the sampled signal. …