Teletext on TV: what it is, how it works and how to manage

Teletext provides round-the-clock entertainment and reference information. All this information is displayed on the TV using a decoder. A decoder is a prefix that is also called a tuner. Having it, you can in addition to the program guide, view content on topics from finance and news to weather forecasts.

General concept

Teletext provides the reproduction of the text as well as the graphic components of the information stream using the television network, displaying it on the TV monitor, taking up space in the designated line. Displays on a TV connected to a decoder:

data that is displayed in twenty-four lines. Each of which places forty characters in the form of letters and numbers;
graphic design of content;
backgrounds decorated with seven shades;
signs that have adjustable brightness;
hidden signs;
urgent news messages, while watching channels, are displayed on the screen automatically;
the ability to sort related pages.

Data is displayed in the form of various directories, their number reaches eight. They put in themselves up to hundreds of pages, each of which has 24 lines. The text is reproduced using a black and white format or color. The range of colors includes the basic color scheme (8 shades). They can be set to flicker mode or synchronized with the channel signal. The transmission speed is forty characters per telestring.

The entire page display period when opening two lines will be 0.26 seconds. That is, to download all the data, we need only about 3.5 minutes. Since 800 pages are not common, the processing time is even shorter. For example, teletext QPT is processed entirely in just 30 seconds. It also provides the ability to embed subtitles in a movie. These dynamic fields are few and they are displayed out of turn to prevent the movie from desynchronizing with text.

Management principle

To navigate through the teletext pages, there are different modes:

List
Fast
Top
Flof

ListThe type of navigation in which all the steps indicated on the screen should be performed. This method of viewing appears less and less, due to the inconvenience that it brings to users.

Fast and FLOF.A more convenient way to move between pages. It is convenient in that it gives the user many options for navigation, as a result of which, you can select the desired page with just one button.

The system is intended for:

ease of use;
easy access to the necessary information;
relevant for modern products;
high speed transmission;
compatibility with any decoders.

The remote control should have buttons green, yellow, white. They are tied to a specific menu.

Thor.It is characterized by simplicity and convenience in accessing pages. All information is cataloged. Each catalog is dedicated to a separate topic. To find the desired topic, use a page where the page addresses are displayed. Its advantages:

simple interface
quick search for the desired topic
minimum download timeout
direct access to control pages
compatibility with decoders that have the ability to process and store an infinite number of pages
It contains additional features that provide ease of use of this mode