Abstract: A multiplex telecommunications system for simultaneously handling digital data, video and voice traffic on a local level using either broadband coaxial cable or optic fibers as a transmission medium.

Abstract: A differential tri-phase shift keyed modulation system permits both data and data synchronization signals to be transmitted at a single frequency which are then differentiated by phase.

Abstract: A signal processing apparatus for use in data communications systems where the transmitted signal is subject to the effects of short duration interference, such as impulse noise, or for use in data recording systems where recorded data is subject to the effects of imperfections in the recording media, wherein a coded transformation is performed on an input signal to the apparatus in accordance with a selected time distribution and selected multi-level, integer related weighting functions to produce a coded signal. A decoder can be used to reversibly transform such signal so as to substantially reproduce the input signal in a manner such that the effects of such noise and recording imperfections are minimized.