| 摘要 |
A mix-effect bank architecture for a production video switcher has multiple programmable outputs, the outputs being determined by a selected operational mode including split, programmable clean feed and mix minus modes. Four keyers with video and key signal inputs produce four outputs. The outputs are selectively routed to four corresponding inputs of four mixers, which mixers also have two pairs of background/utility video inputs. The four mixers provide four outputs which are determined by the selected operating mode. A pair of background video signals may be provided to all of the mixers to provide programmable clean feed outputs, or the pair of background video signals and a mix minus pair of background video signals may be provided to the mixers to provide mix minus outputs, or a primary set of background video signals may be provided to two mixers and a secondary set of background video signals may be provided to the other two mixers for the split mode.
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