Bipolar Pulse Transmission with Zero Extraction

A family of pulse transmission plans, suitable for wire pair or coaxial repeatered lines is described. In these plans alternate pulses are inverted before transmission, and blocks of
n
successive spaces are replaced by distinctive patterns. The resulting pulse stream has no dc component and a minimum pulse density of
1/n
. Limitations on
n
are derived and examples given. Spectral densities are calculated and a typical circuit realization is shown.