Method for transmitting periodically repeated teletext data in a television receiver

US5355170A · kind A · utility

Assignee

• Telefunken Fernseh und Rundfunk GmbH · DE

Inventors

• Gerhard Eitz · Poing, DE
• Gerhard Moll · Gräfelfing, DE

Key dates

• Filing date: Dec 12, 1991
• Grant date: Oct 11, 1994
• Expiry date: Dec 12, 2011

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N7/0882
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

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(s) 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.