1. A communication system for the dissemination of digital data constituted by a succession of 0 and 1 bits coming from a data source, said communication system comprising: grouping means fed from said data source for grouping said bits in the form of vectors of N binary components, orthogonal transformation means receiving the vectors having said binary components and converting them into orthogonal vectors each having N analogue components, analogue means arranged for disseminating said orthogonal vectors, reverse transformation means receiving the disseminated orthogonal vectors, available at the output of said analogue means, and means for reconstituting said succession of bits from the reconstructed vectors of N binary components furnished by said reverse transformation means.