2010年10月6日 星期三

Digital technology and Analog technology

What is analog technology?

People accept digital things easily enough, often by thinking of them as electronic, computerized, and perhaps not even worth trying to understand. But the concept of analog technology often seems more baffling—especially when people try to explain it in pages like this! So what's it all about? (I find it in the internet)



What is digital technology?

Digital is entirely different. Instead of storing words, pictures, and sounds as representations on things like plastic film or magnetic tape, we first convert the information into numbers (digits) and display or store the numbers instead. (I find it in the internet)


Which is better, analog or digital?
An analog watch might be far more accurate than a digital one, and if it has a sweeping second hand it will represent the time more precisely than a digital watch whose display shows only hours and minutes. Generally, the most expensive watches in the world are analog ones (of course, that's partly because people prefer the way they look); though the world's most accurate atomic clocks show time with digital displays.

One interesting question is whether information stored in digital form will last as long as analog information. Museums still have paper documents that are thousands of years old, but no-one has the first email or cell phone conversation. A lot of information recorded on early computer memory devices is completely impossible to read with newer computers; even floppy disks, commonplace as recently as the mid-1990s, are impossible to read on newer computers that no longer have built-in floppy drives.

That's why, though the future may be digital, analog technology will always have its place!

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