Question

how does a picture come on screen of T.V

Answer 1

An antenna (aerial) on your roof picks up radio waves from the transmitter. With satellite TV, the signals come from a satellite dish mounted on your wall or roof. With cable TV, the signal comes to you via an underground fiber-optic cable. The incoming signal feeds into the antenna socket on the back of the TV.

Answer 2

The basic idea of television is "radio with pictures." In other words, where radio transmits a sound signal (the information being broadcast) through the air, television sends a picture signal as well.

We can see things because they reflect light into our eyes. TV signals transmitted through the air in this way.

With traditional television broadcasting, picture signals are sent in analog form: each signal travels as an undulating (up-and-down moving) wave.

digital television, which works in a similar way to digital radio. Signals are transmitted in a numerically coded form. Many more programs can be sent this way and, generally speaking, picture quality is better because the signals are less susceptible to interference as they travel.

That's how picture comes on TV screen.

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