The TEA1002 is a PAL video encoder chip produced by Mullard in 1982 and used on the Mattel Aquarius and AlphaTantel computers. It was also used on

teletext A British Ceefax football index page from October 2009, showing the three-digit page numbers for a variety of football news stories Teletext, or broadcast teletext, is a standard for displaying text and rudimentary graphics on suitably equipp ...

decoders and color bar generators associated with video test equipment The chip is capable of displaying 320 x 192 pixels (within borders), 40x24 text blocks (with 8 x 8 pixel character block) and 80x72 addressable graphics. It generates 16 colors based on

Luminance Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that passes through, is emitted from, or is reflected from a particular area, and falls withi ...

Chrominance Chrominance (''chroma'' or ''C'' for short) is the signal used in video systems to convey the color information of the picture (see YUV color model), separately from the accompanying luma signal (or Y' for short). Chrominance is usually represente ...

and Saturation with the 8 basic colors being similar to the EBU 75% color bars.

Levels

According to the TEA1002 datasheet, colors are formed by the combination of three signals: Luminance, Chrominance and Saturation. The following table lists the internal signals and shows an approximation of the generated colors, as seen on a web standard sRGB monitor. Colors could be different when seen on an analog

NTSC The first American standard for analog television broadcast was developed by National Television System Committee (NTSC)National Television System Committee (1951–1953), Report and Reports of Panel No. 11, 11-A, 12–19, with Some supplement ...

or PAL

CRT CRT or Crt may refer to: Science, technology, and mathematics Medicine and biology * Calreticulin, a protein *Capillary refill time, for blood to refill capillaries *Cardiac resynchronization therapy and CRT defibrillator (CRT-D) * Catheter-re ...

television Television, sometimes shortened to TV, is a telecommunication medium for transmitting moving images and sound. The term can refer to a television set, or the medium of television transmission. Television is a mass medium for advertisin ...

. Internally colors are stored in a 4 bit RGBI arrangement. There are three bits for the RGB components (generating 8 primary colors at full saturation but 75% luminance - similar to the

EBU colour bars The EBU colour bars is a television test card used to check if a video signal has been altered by recording or transmission, and what adjustments must be made to bring it back to specification. It is also used for setting a television monitor ...

) and an ''intensity'' bit that controls a variation of the base color (a 75% ''luminance'' decrease for white, creating gray; a 50% ''chroma'' saturation decrease for the RGB primary colors).

References

{{reflist Graphics chips

Levels

See also

References