Why Would You Need A Fiber Optic Audio CableAudio is such a low frequency that it's hard to imagine that you'd need a fiber optic audio cable; but the secret to why you need one is digital. Digital signals are being passed through a fiber optic audio cable, not analog signals. Audio goes from 40 hertz up to about 20,000 hertz. Dogs and other animals can hear above those frequencies and elephants can hear way below those frequencies; but humans who are around age 20 can hear that range. By the time a human has blasted his eardrums out at rock concerts, at 40 years of age that has dropped down to 12,000 on the top end and 60 hertz on the bottom end. Hertz means 'vibrations or cycles per second'.
An oscillation might be a physical oscillation, which is what we're used to. The eardrum works in that manner. As compressed air hits our eardrum, it dents inward. When a 'rarefaction' hits it (the air is less dense than normal) it pulls it out. That creates a vibration that you can see. If you draw a line where the upwards going line defines how much is pushed-in and a down-going line shows how much it is pulled-out, then that's what an audio wave would look like. However, electronics isn't a physical movement. Inside the wire there are electrons, which can be thought of as 'things' (they learned over the last seventy years that they aren't as much 'things' as we'd like them to be, though). When these electrons pass one way in the wire, that's the up direction, when you're plot the line, this time, the plot means direction in the wire rather than distance that the eardrum moves. When the electron isn't moving at all, that's zero on the scale. That's when it crosses the X axis on a plot; and when the electron moves in the other direction in the wire, that's the line going into the negative area of the graph. Thus, electronics can mimic what a physical vibration can do. If that's the case, then sound can be turned into electricity¡ and that is what audio is. When you're eardrum is in the same position it would be if it weren't moving, that's zero relative to your ear. A fiber optic audio cable doesn't pass these 40 Hz to 20,000 Hz signals through the wire. They chop up a sound into many pieces. The more pieces it chops the sound up into, the better it'll be when you reconstruct that signal on the other end. The advantage of doing it this way is that you can absolutely be assured that if you break the music into a digital signal¡ pass it through a wire, then reconstruct it on the other end; it will be absolutely the exact same as it was before it left on the passage through the cable. It won't be one iota different. Now an RG6 coaxial cable, on the other hand, if you were to send a signal through it¡ is a wire. It's passing a voltage through the wire that varies with time. If the wire that it's passing through comes near an electrical outlet, or wires passing through your wall that you can't even see, that 60 cycles-per-second is going to leap out of that wire a little bit and pass into the audio cable. Then, the sound will be riding on top of a 60-cycle 'hum'. What if you were passing video information in the old Coaxial manner, then. The video signal would now be riding on top a 60 cycle hum; which does strange things to the circuit unless that 60 cycle hum can be removed. Unfortunately, audio is also within 60 cycle range. And, you can't exactly just remove 60 cycles without also removing 100 cycles and 120 cycles to a lesser degree and so on, and so on¡ If, on the other hand, you pass the video signal as digital information via HDMI cables, then it's a digital signal that's being sent, not a video signal. The 60 cycle is protected from being absorbed by a fiber optic cable because the only reason it could do it before is because electricity which passes through a WIRE does that. When it passes through a glass tube that light is going through it does NOTHING. And, so is the case with any other frequency. There is no transmission effect or antenna effect with fiber optic cable; so therefore there is no ability to pick up stray electronic signals, like a category 5 cable would. And, if you wish to use a splitter to get two signals from that signal, you can do it without any attenuation or change to the incoming signal at all. A fiber optic splitter just splits the beam of light into two paths. Bingo, you get two perfect signals. With wires, you have to send it through a transformer. There's loss, there's a potential that the signal might degrade even more. |
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