HDMI is an industry supported interface capable of transferring both audio and video signals over a single cable. While HDMI is highly regarded for its streamlined design, it is also extremely versatile in that it can carry various levels of signal quality from standard transmissions to 1080p high definition resolutions. If you want to hook up your device that only uses AV or composite outputs to your HDMI-enabled TV, use a converter box to convert the signal.
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Connect one end of the AV composite cables to the "Audio+Video OUT" jacks on your DVD player, VCR or other video source.
Plug the other end of the cables into the "Video+Audio IN" jack on the converter box.
Insert one end of the HDMI cable into the "HDMI" port on the converter and plug the other end into the "HDMI IN" port on your TV or other monitor.
Plug in the converter box and turn on the video source to begin converting the AV signal to the HDMI format.