The Thor Digital HDMET series of HD digital modulators takes a digital signal such as HDMI, component (Y, Pb, Pr) or composite video and creates a COFDM (DVB-T) signal for distribution to digital TV's. There are two models of the HDMET available, the HDMET-901 processes one program and the HDMET-902 which processes two programs. Because the HDMET-902 actually encodes the inputs into MPEG2, it then multiplexes the two into a transport stream and modulates them both on a single COFDM channel. This is a more efficient use of bandwidth allowing more content on your system.