PARITY FRAMING OF PULSE SYSTEMS

摘要

PARITY FRAMING OF PULSE SYSTEMS A carrier system is described in which a number of pulse encoded signals are multiplexed on a single transmission and demultiplexed and decoded at a remote terminal for distribution to a number of receivers at that location. A similar multiplex system uses a separate return pair for transmitting signals in the opposite direction. The multiplexed signals on each transmission line are framed by means of a framing pulse in each frame having a value which ensures a preselected parity for each frame. To make sure that parity discrepancies will exist for other pulse positions even under all "ls" and all "Os" conditions, a second bit position is filled with a randomly-valued bit.