In modern communication devices convert sound into electrical signal, and the resulting the resulting currents change with time in exactly the same as the corresponding sounds transmitted via electric lines or by radio.

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In place of the reception electric vibrations are converted into sound. The sound vibrations are converted into electrical point of origin to the microphone. In place of the reception electric vibrations are converted into sound by phone.

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A microphone and a telephone in each of the reception and transmission capabilities provide two-way conversation.
The invention relates to an electric telephone in 1876 in the first sample and the handsets used for transmission and reception. Said something had to quickly move the phone to your ear to hear the speech of his interlocutor. To talk not forget to do it, about "phone box" hanging out reading: "Do not listen to his mouth and not talk your ear." In the modern technology used many types of microphones: carbon, condenser, electromagnetic, piezoelectric, and others.