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In fact, DVI is the only standard which can carry both analog and digital signals on one interface. If the display is analog, the DVI connection will convert the digital signal to an analog signal, otherwise no conversion will be necessary. It is worth mentioning that, the analog video bandwidth of DVI is higher than VGA, thus higher resolution can be supported compared to VGA. So, it can be applied by high resolution displays such as UXGA and HDTV. DVI cables or ports with fewer pins are designed for lower resolution devices. In order to support maximum resolution, the DVI port should contain all the pins.
Since DVI does not support High-bandwidth Digital Content Protection (HDCP) encryption by default, by using hardware which only includes DVI ports, the video protection is not guaranteed. This is the biggest drawback of DVI. Since HDCP protects video from illegal copying, this feature is very critical for video surveillance systems. DVI has several variants: DVI-D (digital only), DVI-A (analog only) and integrated DVI-I which carries both digital and analog video. DVI connections are popular on computer video cards, monitors and projectors.
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HDMI High-Definition Multimedia Interface (HDMI) transmits uncompressed digital HD video and audio data in a single cable, while other connections require separate cables for audio and video. For instance, a component cable connection uses three cables for video and two for audio, resulting in five cables totally. While using HDMI, the uncompressed audio and video information can be transmitted using one cable, thus cable clutter is eliminated greatly. Since HDMI is a digital connection, it is more robust to interference and noise problem compared to analog connections.
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Since most processes are the digital such as DVD players, Blue-ray players and game consoles, so by using HDMI for these consumers the analog to digital conversion will be eliminated. So, it leads to better quality picture and sound compared to other connections. Also HDMI supports HDCP, meaning that it is practical for video surveillance systems. HDMI connection is the most popular display interface, found on every TV, AV receiver, Blue-ray disk player, DVR, laptops and digital cameras, because by using HDMI, there is no need to buy separate audio and video cables. Therefore, fewer cables and connections are used.
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DisplayPort DisplayPort as a standard port to connect PCs, laptops, and other computers to video monitors has been called ultimate digital connection. It is a high definition AV connection which transmits audio and video data over a single cable with a locking connector. DisplayPort is a simple but high bandwidth interface which provides true digital images and clear sounds. It can even supply power. One of the advantages of DisplayPort is that it works with older technology, as by using simple adapters, it is compatible with VGA, DVI even HDMI.
DisplayPort enables high display performance, robustness, versatility, highest degree of system integration, and great interoperability among various device types. DisplayPort was originally developed as the next generation personal computer display interface and is now available on a wide range of tablets, notebooks, desktop computers and monitors. It is included on all er Macs and many Dell, HP, and Lenovo computers and is also available on video graphics cards.
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