Background:
As the HDTV market continues to heat up, consumers are required, the cutting edge of technology designed to make smart purchasing decisions. There are a plethora of articles explaining the technical pros and cons of the three dominant HDTV display technologies namely: LCD, plasma and DLP. However, one major, but overlooked when choosing an HDTV set to the type of connection to high-definition video. The video connections available for HDTV are: componentVideo, DVI (Digital Video Interface) and HDMI (High Definition Multimedia Interface). We briefly the advantages and disadvantages of each.
Hdmi
Component video cable commonly referred to as R, G, B (red, green, blue) indicates it is actually composed of 3 separate cables because it distributes the three basic color components for display. All colors are weighted distribution of individual components red, green and blue are generated. Of the 3 HD connection technologies available today, analog componentThe video is a mature technology.
Advantage: Analog component video cable is mature and affordable.
-Disadvantage: component video cables are analog! All HDTV sets are inherently digital therefore extra digital to analog conversion and analog-to digital is necessary, necessary to process the video. This extra conversion can introduce video artifacts. Since all HDTV is digital, it only makes sense to use a fully digital connection such as DVI or HDMI.
DVI (DigitalVideo Interface), as the name suggests, is an all-digital video connection. Unlike analog component cables the DVI interface transports the original digitized R, G, B video signals from HD source to HD display. Since it is digital, no artifacts or degradation will occur. You get exactly the image that provides the video source without degradation. DVI connection is often found on HDTV and PC graphics cards.
-Advantage: DVI is ALL-digital, so there is no imageDegradation from source to screen.
-Disadvantages: digitizing R, G, B requires extremely high-bandwidth. The aggregated data of the digital R, G, B signals 1.65 Gbps! The high bandwidth means that cable quality is important and also the link distance is limited. Typical link budget for a DVI is ~ 15 ft.
HDMI (High Definition Multimedia Interface) is the last state of the art video and audio connection. Technically, HDMI is identical to DVI with 3 notable differences. 1) HDMIa much smaller connector (it looks like a USB jack), 2) HDMI uses HDCP copy protection called (High Definition Copy Protection), and 3) HDMI digital audio transmission. HDMI, DVI, it is as all-digital therefore picture quality is "perfect" from source to screen.
-Advantage: HDMI is a digital video and audio connection. Only one cable is required for the transport of audio and video! This reduces cable clutter behind the theaterSetup.
-Disadvantage: Like DVI, the link is removed and a limited number of high-quality cable is necessary because the intrinsically high-bandwidth digital transport for the R, G, B video required.
Conclusion:
As the HDTV market continues to mature, consumers must be educated on the HDTV video connections available. We briefly the most important functions together with the advantages and disadvantages of each solution outlined connection, then the smart choice for consumers in the choice ofHDTV video connections.
HDMI, DVI and Component Cables Explained
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