An FPGA based teletext inserter chip

A teletext inserter chip developed on an FPGA is presented. Together with a few number of analog IC components, the chip can be used in conjunction with a PC to forms a versatile teletext inserter. The PC is used to edit the teletext information and send the teletext data through its parallel port to the chip. The data are stored in the chip until the designated TV scan lines are reached and then shifted out serially to be inserted in the composite video signal by another analog circuit. The chip is designed by using VHDL models and synthesized on an FPGA chip with 5,000 gates equivalent complexity. It can insert up to 8 teletext data lines per TV signal field.