Teletext and to pad out the fixed packet. The vertical caption position is determined by the packet address. In the case of the Ceefax and ORACLE systems and their successors in the UK, the teletext signal is transmitted as part of the ordinary analog TV signal but concealed from view in the Vertical Blanking Interval (VBI) television lines which do not carry picture information. The teletext signal is digitally coded as 45-byte packets, so the resulting rate is 7,175 bits per second per used lines (41 7-bit 'bytes' per line, on each of 25 frames per second). A teletext page comprises
TVNZ is still use the former channel programs). TVNZ began a teletext service in 1984 originally with the intention to help New Zealand's deaf community get improved access to news and information. A captioning service was available for certain television shows and could be accessed by browsing to page 801. The TVNZ Teletext service could be received on all TVNZ channels and the TVNZ service could be received on TV3 including captioning of some TV3 shows. Trackside also operated a Teletext service called TAB Text which only displayed the racing pages of Teletext. A Teletext capable television was usually required to