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- [Presenter] For most of us, a mobile phone is a part of our lives. But Im sure youre curious minds have always been struck by such questions as how a mobile phone makes a call, and why there are different generations of mobile communications? (upbeat music) Lets explore the technology behind mobile communications. When you speak on your phone, your voice is picked up by your phones microphone. The microphone turns your voice into a digital signal with the help of MEMS sensor and IC. The digital signal contains your voice in the form of zeros and ones. An antenna inside the phone receives these zeros and ones and transmits them in the form of electromagnetic waves. Electromagnetic waves transmit the zeros and ones by altering the wave characteristics, such as the amplitude, frequency, phase, or combinations of these. For example, in the case of frequency, zero and one are transmitted by using low and high frequencies respectively. So, if you could find a way to transmit these elec
