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A High-Definition Multimedia Interface cable is the modern standard for trasmitting high-definition digital video and audio. HDMI cables can carry both standard and 3D video as well as surround sound audio and internet. For this reason, most modern game consoles and televisions use HDMI to interface with computers or set-top boxes.
RCA connectors, also called phono connectors, are analog cables and have been used for years to transmit standard definition video and audio. RCA cables for home theater are usually seen in triples: a yellow video jack, and the red and white stereo audio cables.
The Sony/Phillips Digital Interface Format is used for transmitting digital audio. It can carry multiple channels and is often used in home theater systems where HDMI does not carry audio
NTSC and PAL are two types of encoding video signals: NTSC is used in the Americas, while PAL is widely used in the rest of the world. Devices designed to play NTSC content cannot play PAL content, and vice versa.
5.1, 6.1 and others refer to speaker configurations. A 5.1 speaker system has five (5) satellite speakers and one (1) subwoofer. This is the standard method of referring to speaker configurations. For instance, a 3.3 sound system would be a strange one with three satellite speakers and three subwoofers
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