Communication
A Peek Into the Near Future of Electronics Technology by Terry Mitchell
(Contd. from page 4...)
High Definition Television (HDTV) is one possible use of digital signals. HDTV uses the entire digital bandwidth and is the crystal clear format you've probably seen on TVs in electronics stores. It has no visible lines on the screen. Someone once described it as being like "watching a movie in the theater." Keep in mind that all HDTV is digital, but not all digital is HDTV. Along those same lines, not all digital TVs are HDTVs. Since digital TVs are very expensive and those with HDTV capability are even more expensive, consumers really need to keep this in mind.
The other possible use of digital signals is channel compression, often referred to as "multicasting." Non-HDTV programming does not utilize the entire width of a digital signal. Therefore, it is possible to compress two or more channels of programming into one digital signal. Satellite and cable operators do this all the time with their non-HDTV digital channels, but this process is transparent so many people don't realize it. Many broadcasters plan to use their digital signals this way during times when they are not being used for HDTV programming. For example, some plan to air all news and all weather channels in addition to their regular channels of programming.
TV recording and playback technology is changing as well. DVD recorders, which debuted about four years ago, have now become affordable to the average family. A couple of years ago, they were priced above $1000, but now you can get them for around $250, in many cases. The main sticking point now with DVD recorders is that not all of them will record/play all three of the competing formats: DVD-RAM, DVD-RW, DVD+RW.