What are Interfaces? How are they used? Categories Cross Reference Table

	Step 1: What are Interfaces?
	An interface is a signal amplifier that includes signal processing capabilities to drive a signal over various lengths of cable. This is useful for ensuring signal format compatibility between various sources and destinations and to compensate for the effects of marginal quality or long lengths of RGB cable. There are several functions of an interface: to buffer (or convert) the computer's output signal to the appropriate level and format of the local monitor to prevent loading (double termination) and impedance mismatch from the projector, to maintain the video resolution and frequency of the original source, to proveide sharpness (peaking) and gain to compensate for cable loss, to act as a sync processor, and to convert unbalanced audio to balanced audio (active PC audio interfacing).