Digital Encoding of the Video Signal
J. Millard, H. I. Maunsell · Bell System Technical Journal · 1971
We describe in this paper the theory and implementation of a differential pulse code modulation system that is employed in the Picturephone® network. Established and original coding techniques have been combined to allow transmission of a coded one-megahertz analog signal over a 6.312-megabit-per-second digital channel.