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ancillary data space (ANC)

In digital TV, the ancillary data space (ANC) corresponds to the blanking interval in analoguevideo. Additional information for digital TV is transmitted in the ANC area. This includes the Time Code (TC), the embedded audio, subtitles and the data for error detection, especially that of Error Detection and Handling (EDH). The Ancillary Time Code

(ATC) is also inserted in the ANC space.

ANC at different digital TV standards

ANC at different digital TV standards

The number of pixels

sampled out varies extremely between the different digital TV standards and is, for example, 144 pixels at576i/25 and 720

pixelsat 1,080i/25. Adequately to analogue TV, digital video

also has vertical and horizontal gaps, the Vertical Ancillary Data Space (VANC) and the Horizontal Ancillary Data Space (HANC). In order not to increase the data stream unnecessarily when broadcasting digital TV, the Ancillary Data Spaces are not necessarily inserted into the data stream.

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Englisch: ancillary data space - ANC
Updated at: 06.12.2008
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