Information storage can be easier in digital systems than in analog ones.

But for music aficionados and casual listeners alike, creating new digital discs from old analog ones can have practical as well as nostalgic rewards.

One reason is that packing circuits ever closer together, which increases the speed of digital chips, only causes noise and heat problems for analog ones.

Then at the end of the transition period - originally set at 15 years - the digital channels would continue and the analog ones would be turned off.

Nowadays, digital video systems are replacing analog ones, and evaluation methods have changed.

Despite federal regulations that require them to begin sending digital signals over the air in addition to their analog ones, broadcasters have been slow to comply.

Digital transmissions require less power to be received clearly than analog ones.

Digital mixers are more versatile than analog ones and offer many new features, such as reconfigure signal routing at the touch of a button.

This is because digital transmissions can be packed into adjacent channels, while analog ones cannot.

Digital converters have the same purpose as analog ones but are able to receive digital cable signals.