What actually is the difference between an analog and digital signal?

Question

All we hear about is what we need to do or not do still receive a signal on our TV's come Feb. 17th. So what is the difference between the signals. Where is the digital signal going to originate and does anyone anticipate big problems when the change is made? I sure do because I have had so-called Comcast digital cable for years now and I have had many problems.

Answer 1

Analog is a varying voltage (or power level depending on where in the system you look at it). Because the information is transmitted as a varying signal, it is suseptable to noise (snow), ghosts (reflections) and can only handle one program stream at a time.



Digital is numbers, like computer data. As such, as long as the receiver can make out the numbers, it can correct for any transmission problems like noise and reflections. It will assemble a perfect picture every time. Also, because it's data, many programs can be woven into the data stream. The receivers will just pick out the data packets it needs on the other end.



There are always problems getting vast numbers of people to adopt a new and different technology. It's not familiar, and there is a learning curve. I can remember the early days of cell phones when people needed instructions on how to place calls! Ten years from now, we will wonder what all the fuss was about.



Comcast cable is a bit of a different animal. The transition that is due in February only affects over the air broadcasts one would get with an antenna. Cable companies can do pretty much what they want and the only quality of service standards they must meet art what the customers will let them get away with.



ADDITIONAL:

Comcast is (supposed to be) a close system meaning that, within the cables, it is it's own world. If they can't make it work, complain, cpmplain, complain. You are paying for a working system, demand it.

Answer 2

The big misunderstanding on the change is what is going to change. Come 17 Feb about 1/3rd (the major network so called high power stations)of the countries TV stations will only transmit digital signals. All the rest will continue to stay on their same channels and continue to transmit analog signals. The FCC will then auction off the new vacant slots to the new wireless internet companies that will be using that band space. Thus if you are lucky and want both one needs to get a converter that will pass both analog and digital signals and use a good antenna. Those that have cable, sat or dish need do nothing as they are stuck with what ever their service providers give them. When it comes to HD digital the ones with a good antenna and a converter or a digital tuner get the best signal as all the cable, sat and dish services compress their signals due to band-space problems and the out of the air HD signals are much better.

Answer 3

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Answer 4

an analoge signal is transmitted from a terrestial base such as a television/radio station straight to areial wher a digital sinal is bounced of a sattelite in space and uses binary code

depending on weather conditions and sun activity signal can break up, also depending if company use copper wire or fibre optics can affect signal strength

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