SIGNAL SWITCHING DEVICE, SIGNAL DISTRIBUTION DEVICE, DISPLAY DEVICE, AND SIGNAL TRANSMISSION SYSTEM

摘要

There is provided a signal switching device including an interface having a video signal communication section, a DDC, and an HPD and controlling a device connected or controlled by the device connected. A switcher (2) includes: a switch (30) for selecting a video signal input; a DDC (26c) for reading information from an output destination device; a microcomputer (33) for reading the physical address of the switcher (2) and information indicating the state of the output destination device via the DDC (26c); a DDC (22a) and a DDC (22b) for outputting information to a plurality of input source devices. The microcomputer (33) stores the physical address of the switcher (2) and the aforementioned information in an EDID memory (32) and reads out the information from the EDID memory (32) for outputting it via the DDC (22a) and the DDC (22b).