Abstract :
Equipment is now available to utilize the vertical interval of the television signal to transmit digital information. A vertical interval (VI) encoder selects any line, 13 through 20, onto which is clocked the data originating from a character generator, computer or other digital device. At the receiving point, data are decoded for display in "real time" using a character generator, printed out in hard copy, or used to initiate electromechanical operations through proper interfaces.
