While using a High-Definition Multimedia Interface (HDMI) cable to connect your digital equipment, such as Blu-ray player or digital cable box, is the best way to get the most out of your high-definition television, it isn't absolutely necessary. In addition to HDMI interfaces, most digital devices also feature other interfaces for connecting to your TV. Some of these interfaces, such as component video, use several plugs to carry the various video and audio signals to your TV. They also often convert your digital signal into analog for the transmission process, which reduces the picture quality to some degree. The only way to transmit a pure digital signal from your home theater equipment to your TV is through a digital standard like HDMI or digital video interface (DVI). HDMI, however, is the most convenient standard, because it only uses one cable.
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