Digital Video

The advantage is that since the video signal never goes from digital to analog, there is no conversion related quality loss. Digital displays are generally sharper than their analog digital video like DVI and HDMI are discussed.

DVI – Digital Visual Interface (DVI) was developed to transmit digital video far and at higher quality. It is like a standard D-sub connector, but has few pins which are asymmetrical in their placement on the connector.  There are five types of connector but DVI is divided into three main categories of DVI-A (analog-only connector), DVI-D (digital-only connector) and DVI-I A (both analog/digital connector).

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DVI-D and DVI-I connectors are further divided into single link and dual link. Dual link have more connectors than single-link, and also give higher speed and signal quality due to additional links but, all components, as well as the cable, must support the dual-link feature. DVI-A and DVI-I analog is superior to VGA, but more vulnerable to electronic noise with advantage of farther signal travel without much degrading.  Maximum bit rate for Single link is 3.96 Gbit/s and for dual link it is limited by copper bandwidth, source limitations, and destination device. The cable can support only one device and can extend upto 15 meters but for longer distances, DVI booster is to be used.

HDMI – High-Definition Multimedia Interface (HDMI) is a compact audio/video interface for transmitting uncompressed digital data to provide higher resolution. It is hot pluggable and maximum bit rate of 10.2 Gbit/s. An HDMI connection can either be single-link (type A/C) or dual-link (type B). There are five HDMI connector types. Type A/B are defined in the HDMI 1.0 specification, type C is defined in the HDMI 1.3 specification, and type D/E are defined in the HDMI 1.4 specification. HDMI 1.3 defines two cable categories: Category 1-certified cables, for 720p60 and 1080i60 also called “Standard”, and Category 2-certified cables, for resolutions such as 1080p60 and 2160p30 also called as “High Speed”).

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Analog Video
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