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. 5. A method of transmitting a digital information signal according to claim 3, wherein said plurality of sequences of words occur in a plurality of cycles each of a plurality of adjacent input channels, so that the plurality of such cycles together constitute said plurality of channels; and said step of analyzing the first block of words to said first error-correcting encoder includes cyclically distributing the sequences of words such that three cycles are transposed to form four cycles.