TV with only one HDMI input
My TV has only one HDMI input, but I want to run both my ATV and HD Cable. All the HDMI splitters that I have seen do their switching automatically. Maybe this is a naive question, but isn't ATV always sending out a signal (i.e. screensaver or the like)? So, how will the switcher know when to accept the ATV signal versus the cable signal? Or, do I need a switch that is controlled manually? Any problems that anyone has seen using this setup?
Thanks for any help
Mac OS X (10.6.2)