How can electronic signals ( ex: a Bit) can transform into a video, audio, data, program and control signal?

I mean what is the logic behind it? It may have different interface cards etc., but how can those convert the signals into their desired manner? Sorry, I have the question in my mind, but I can't put it in a proper manner.How can electronic signals ( ex: a Bit) can transform into a video, audio, data, program and control signal?
It's not the bit (or byte), but what you do with it.





Old video monitors didn't use binary (ones and zeroes, aka bits. BTW 4 bits make a byte). They relied on an analog signal, like TVs.





New monitors are now digital, that is, they use bytes to process your video signal. Without getting too technical, say your monitor gets this: 001101011100. The circuits inside the monitor convert this to a color and a pixel, and paint accordingly. Do that really fast over and over again, and you get animation, words, pictures, etc.





Each interface has its own logic. The video card does one thing with its bytes, and the CPU does another. The reason that it works across different monitors and video cards is that there are standards. Monitors, no matter who makes them, process the signals in the same way (or mostly the same way). Video cards, whether they are Nvidia or ATI, transmit signals to the monitor in the same way.





The devil is always in the details, but that's the low-level version of it. How these circuits process the bytes, and how they send them, is the subject of many university-level courses, as well as the trade secrets of many corporations.





Hope that helps!

nars