Process and device for transmitting teletext data

Details Process and device for transmitting teletext data Process and device for transmitting teletext data

H - Electricity

04

N

H04N 7/087 (2006.01) H04N 7/088 (2006.01)

Patent

CA 2054770

- 19 - A b s t r a c t In order to compatibly transmit teletext data in the form of special characters, fine textures and color hues at higher WST levels, complementary data in the form of one or more associated complementary pages are transmitted for each page of teletext by the broadcaster in addition to the basic teletext data of conventionally structured teletext pages (level 1). The complementary data for some or all teletext pages are transmitted preferably in at least one complementary page. In the receiver, the complementary page(s) associated with a selected teletext page are temporarily stored separately from the corresponding teletext page (9) and processed so that the characters associated with the basic data are displayed in those character positions where there is no complementary data present. The characters associated with the basic data in cooperation with the complementary data are displayed in those character positions where complementary data is present.

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