STV3550 datasheet(51/144 Pages) STMICROELECTRONICS

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Graphics Functional Description

STV3550

51/144

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Subtitle mode (full-quality picture with subtitle windows)

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Newsflash mode / Box attribute (Text with solid background, other areas with standard video)

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Zoom mode: Characters and semi-graphic symbols are zoomed in by a vertical factor of 2.

The zoom is done by software. Half a page is then displayable. A key enables the user to

alternatively display the upper half of the page, the bottom half of the page or the complete

page without zoom.

4.3.2

Teletext Level 2.5

In Teletext 2.5, additional graphics objects are decoded to enhance Teletext page content. Up to 32

re-definable colors can be used by graphic objects. Moreover, up to 16 columns can be added to

either side of the page. Horizontal resolution is then increased to 672 pixels per line.

4.3.3

TeleWeb

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Full support of authored content in a 640 x 480 pixel area

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Minimum colour resolution of 12 bit (RGB = 444), 24 bit recommended

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Support for a minimum of 196 colours (the default CLUT)

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Software Dithering to achieve best color matching

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Support for full (100%) and partial (30%) transparency

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Support for GIF, JPEG and PNG image formats, including animation

Figure 36: Teletext Level 1.5

STV3550 Fiches technique(PDF) 51 Page - STMicroelectronics