Clean feed (TV)
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In television technology, clean feed is a term that describes the output of a vision mixer before the downstream keyer stage. The clean feed identical to the main output but without any key on it.
The clean feed signal is used in sport production to allow different TV station to key its own graphics on a common signal, or in news broadcasting to produce two or more different streams, each one with the same graphics but in different languages.
Modern production equipment can actually put different keys on multiple outputs, allowing them to go to the clean feed or not. The most sophisticated vision mixers (or production switchers, according to the American nomenclature) can generate a clean feed output for any of their mix/effects rows.
