DVI : Is digital really better than analogue?

It was many years ago that music changed from analogue to digital. Those beautiful vinyl discs with their artwork covers were replaced by little CDs in little plastic boxes. No longer would recordings be ruined by scratches and warps. CDs would replace these with perfect everlasting music. Actually CDs turned out not to be everlasting but that is a different story.

But the change from analogue to digital music did not suit everyone. Even today there are many people who really hold that a certain quality was lost during this conversion. A principal criticism was that digital sampling of the original music source created a certain harshness in the sound and reduced those beautiful mellow transitions between harmonies.

Over recent years we have seen a similar transition take place in video. The Digital Video Interface (DVI) was invented quite a few years ago and since then there has been a slow transition from analogue video to digital video. It is fairly safe to say that that transition is more or less been complete and very few, if any, analogue monitors are still produced.

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What losses and gains has this revolution brought to our experience of video? Well, the gains are obvious. For instance, High Definition TV would not be possible in an analogue world and we can pack a far greater number of channels into the same bandwidth.

But have there been any losses? Have there been any disadvantages in moving to digital video? In fact there are several disadvantages which are very real. The major one is interference.

When you experienced interference in your old analogue set-up, possible caused by atmospheric disturbances, an over flying aeroplane, or even road traffic, the picture would wobble, distort a little, a few lines might appear, but you could still pretty much see what was going on. It rarely became unwatchable.

When you get interference with your digital set-up the picture becomes totally unwatchable with clumps of colour, picture freezing, often accompanied by extremely unpleasant sound effects. You get the feeling that the whole thing will explode any second.

There are other disadvantages too. The necessary digital compressions can lead to visual artifacts, especially under certain conditions. So DVI is not without its problems compared with analogue.
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