VIDEO TAPE AND APPARATUS FOR PLAYING SUCH A VIDEO TAPE

摘要

A pre-recorded VHS video tape has teletext data multiplexed with the video signal. The teletext data is encoded into a multilevel, for example four level, code at a reduced data rate so that it falls within the bandwith of a VHS recorder. The recorder includes a decoding circuit which takes the multilevel code and converts it to binary data. The binary data is then encoded into standard teletext packets for acquisition by a standard teletext decoder in a TV set. The teletext data is updated as the tape is played so that a given teletext page contains different data at different points along the tape. A number of creative programme applications are disclosed.