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I have added a reference to the clean feed signal. I don't know if this term is used in US, I am quite sure it is in Europe. However, since it is reported in any Sony, Grass Valley, Philips or Snell & Wilcox switcher I have seen, it should be of common use.
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Many of the switchers that only route to one output actually route to two outputs. That is, they have a program output (which is what is currently being displayed or broadcast) and they have a preview output (which shows what is cued up to be displayed next).
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The term "clean feed" is used in the US, mostly on remote trucks (OB vans) used for sports broadcasts. It is, as you mentioned in your article edit, the program output before any downstream keys are added.
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Also, many of these switchers will optionally switch the audio associated with the video. Some can also switch the audio independently of the audio (i.e. breakaway audio). Some do not route audio at all.
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The two pictures of actual production switchers are of a Snell & Wilcox switcher, and a Ross switcher. In the TV production world, the dominant switchers (by far) are those manufactured by Sony and
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It's true that "vision mixer" is a uniquely
European term, as I've never heard of it before. The device pictured in the image is what I know as a
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I would recommend that this article focuses on what I call production video switchers, and that the term "video switcher" has its own article.
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I think this should be done, not as a split as suggested, but as a disambig page at
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