| http://www.w3.org/ns/prov#value | - (a) an input line selector for selecting two of n input lines as a first input line and a second input line, where n is an integer equal to or greater than 3; (b) a first detector for detecting a synchronizing signal of a first video input sent through the first input line; the first detector outputting a first detection signal when the synchronizing signal of the first video input is detected; (c
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