Hi, I'm in the first year of my engineering course and I've only completed the first four months of the course. As you can imagine,I don't have a very good grasp over my subjects yet,but I'm trying really hard! In our physics syllabus,we have a few things about communication through coaxial cables,optical fibres etc. about which whenever I look up in library books I find things which are beyond my level.Please give me a basic explanation of certain things I really must have a good idea about,I don't need all the mathematical descriptions-just the intuitive idea. Please bear with me while I cover a very short portion of my course and tolerate my dumb questions! Firstly,I have trouble understanding how pictures,movies and sounds can be represented as electrical signals.Then,in fibre optics,they are represented as light waves and certain systems like 'decoding' and 'encoding' systems are responsible this interconversion--what is basically happening in these systems? Also,what does 'digitization' of information mean? How can light waves carry information in the form of 'on-off pulses' called bits and bytes? (Aren't bits and bytes used in computers??) Finally, antennae are responsible for generating waves-- after transferring the waves into the cable,does the electrical wave propgate through the oscillation of electrons of the metal or the oscillations of the atoms in the metal? Please help me out! As you can see, I lack a basic undersanding of electrical communication--I'm in deep waters!