Expanded switching of video/S-video signals by auto-sense apparatus designed to initiate switching of a different type of video signal and apparatus for emulating one type of signal by another type of signal to initiate said switching

摘要

A video switching system wherein an integrated circuit designed to switch video signals responsive to a first type of signal is used to switch video signals of a second type of signal which is adapted to emulate the first type of signal. Circuitry for adapting the second type of signal to emulate the first type of signal is disclosed. A plurality of the adapted signals, where each would normally be coupled to their own IC input terminal, are couplable to a single S2 protocol terminal of the integrated circuit, through a single lead.