Our other classroom has a Canon VIXIA HV30 in the back of the room trained on the professor. There is a ceiling mic and the prof wears a lapel mic. These two signals feed into the camera and and the entire audio/video signal is fed into the recording computer by a firewire cable. Since the distance is too long for a firewire cable, we have to use Cat5 wire to bridge the distance. At each end, we have to use FireWire Cat 5 Repeaters to convert the signal to Cat5 and then back again to firewire. We also have a SmartBoard in this room that feeds into the computer. All in all, this is our most complicated setup and (no surprise) gives us the most grief.