3. A method of transmitting a digital information signal according to claim 1, wherein said step of applying the first block of words includes delaying the words of at least certain ones of the input channels by an amount different from any delay imparted to the words of the remaining input channels prior to the application thereof to said first error correcting encoder.
3. A method of transmitting a digital information signal according to claim 1, wherein said step of applying the first block of words includes delaying the words of at least certain ones of the input channels by an amount different from any delay imparted to the words of the remaining input channels prior to the application thereof to said first error correcting encoder. 7. A method of transmitting a digital information signal according to claim 3, wherein said plurality of sequences of words occurs in three cycles each of a plurality of adjacent input channels, so that the plurality of such cycles together contribute said plurality of channels; and said step of applying the first block of words to said first error-correcting encoder includes delaying all the words of each cycle of input channels by an amount different from that applied to the remaining cycles.