Computer Storable Teletext System

Based on the introduction of the basic principles of teletext, synchronous separation of video signals, abstraction of row order pulse signals, overlaying of graphical and teletext information by computer are presented and the basic idea of the design and the method of realization of the graphical and teletext information's receiving store and broadcast are mainly discussed in this paper. There are also detailed descriptions of the solution of share collision of buffer storage and the method of signal's abstraction during the procedure of design, which make the whole design complete and practicable.