The principle of telephone

Telephone communication is a communication technology that uses electricity as the medium and transmits language through the mutual conversion of acoustic energy and electric energy. The simplest form of communication between two users is to connect two phones with a pair of wires.

A) When the speaker picks up the phone and speaks into the microphone, the vibration of the vocal cords excites the air to vibrate, forming sound waves.

B) Sound waves act on the microphone to generate current (vibration drives movement, and cutting the magnetic induction line generates current), which is called speech current.

C) the voice current is transmitted to the receiver of the other party's phone along the line,

D) The function of the receiver is just the opposite of that of a microphone-it converts the current into sound waves (when the current is converted into vibration, it makes a sound), which are transmitted to people's ears through the air.

In this way, the simplest call process is completed.