DVI and HDMI vs component video

By | September 10, 2016

Without a thoughtful study of the connectors and their specifications the owner of a modern digital TV can really go and hang that on all these numerous cables. It is still not clear to everyone that it is better – analog or digital connection?

As you know, the European standards provide a clear definition of what properties should have a TV to rightfully be called HDTV. Among these characteristics – the obligatory presence of connectors for digital connection – DVI or HDMI and component analog (component). The answer to the question “which one is better?” quite obvious.

First, let’s clarify the thing which can make a mess and cause unstable buyer in despair – in fact, DVI and HDMI interfaces are almost identical. The principal difference is that you can pass through the DVI only video, and more via HDMI and multi-channel digital audio. Interfaces use different types of connectors, but identical coding system. Therefore, the player with DVI-output can be connected to an HDMI-display in the presence of a simple adapter, without the use of special transformers.

Assumed by default that the digital video – this is something perfect, and no interference problems at all, whereas analog – forever pockmarked screen and curves interference favorite movie characters. In fact, it often does not depend on the connection type, and possibilities of the art, for example, the player and the display.

Properties of the compounds

All three interfaces have similar properties, but the actual video – a completely different type. It is crucial that the DVI / HDMI signal is transmitted in digital format – ie, relatively speaking, as a sequence of ones and zeros, while the analog component – by means of a constantly changing voltage, frequency, etc. In both cases, data are transmitted to the red, green and blue components of the signal and sync lines / frame.

Through digital interfaces DVI / HDMI receives information in a format TMDS – separately for each component video – red, green and blue, in addition to the “blue” channel adds information about the vertical and horizontal sync.

Component analog video functions in a similar way, but here each channel uses a separate physical connection – on the entire panel has three connectors “component”. Data on the overall brightness and synchronization are transferred to the “green” channel (labeled Y or Green), also has a “red minus luminance” (Pr or Red) and “blue minus luminance” (Pb or Blue).

Both types of signals, both digital and component is basically similar, except that the information is supplied in a different form. As will be different at different image quality connections will depend on many factors.

Digital – is not always better

Normally, digital video quality analog. Nevertheless, we should not jump to conclusions and tear of analog cable TV.

First, using decent equipment and connections, there is no reason to distort the video even at significant distances. Secondly, mistakenly assume that the signal in the digital cable rid of errors. Worse, the information delivered via DVI or HDMI interface, is not subject to correction and, if it is distorted – it is lost completely. Of course, this does not happen with quality cable at a short distance, but at large distances – is not excluded.

That affect the quality?

Video never transmitted directly from the source to the display. Original digital video resolution, such as DVD or sputnikovgo receiver is not always soostvetstvuyut “native” resolution of the display and require transformations.

Many digital formats when you convert into each other do not give satisfactory results. Therefore, the “digital-to-digital” can sometimes be far better to convert “digital-to-analog.” Even in the most expensive models of players and digital TVs and quality conversion algorithms differ, sometimes significantly. Always better if the output resolution player / receiver will match “native” resolution of the TV.

In addition, often display settings for digital and analog interfaces initially exhibited differently. Display black levels, for example, are often different for digital and analog signals. If the menu is too complicated devices, you can recalibrate the tire.

Cable quality

Theoretically, when comparing cable DVI / HDMI / analog interfaces should not play any role. These cables are for expensive equipment and are typically performance – at a high level. Nevertheless, there are unfortunate exceptions.

Usually quality analog component connection is very high, even long distances do not affect negatively the quality of the image. However, with increasing length of the cable is sometimes observed appearance of interference, shadows, etc.

Unfortunately, DVI and HDMI in this regard even weaker. For the connection using a twisted pair of coaxial cables, which, when the length substantially loses as transmission data. Packages bits can “looped”, superimposed on each other indefinitely until the icon disappears altogether.

Data transfer via digital cable is too long leads to noise levels that will be regularly “fall” pixels across the screen. If this cable to extend further, the image may disappear altogether. Although some digital cables could work correctly and at a length of 15 meters, much depends on the effective combination of source / receiver signal.

Which is better?

Precise answer to the question “Which is better?” Seems impossible to find. DVI or component? HDMI or component? Image Quality determines the quality of the signal and the display quality of the cable, etc. It may well be that the DVD is better played through HDMI, and the signal cable or satellite TV – via a component interface.

As the standard for HDTV provides for both digital and analog inputs, better to test all combinations.

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  1. Pingback: What are video | Monoblocks: All-in-one

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