1.   Images could be converted from light or other radiation to an analog electrical signal.

2.   It receives an analog video signal and converts it to a digital signal.

3.   Analog signals move in waves.

4.   Analog signals are sent from the TV-station tower in electromagnetic waves whose size, shape and intensity are modified as the original images and sound patterns change.

5.   And, failing to win the auction, broadcasters would find themselves figuratively tethered to an analog signal that will look increasingly antiquated.

6.   Avistar delivers full TV-quality video by running analog signals over spare wires available in most buildings when they install their computer network.

7.   Because digital signals carry bits of information that are far more compressed than those of analog signals, they can transmit much more data.

8.   After an interim period in which Americans would swap their conventional television sets for digital models, the stations would have to turn in their original analog signals.

9.   But analog signals may not be around for that lifetime.

10.   But Jacobs said the threat of satellite radio may also help push traditional radio stations to convert their age-old analog signals to digital.