Antonio meucci was the Italian inventor of the telephone. On June 15, 2002, the US Congress passed a bill that antonio meucci was the inventor of the telephone, so meucci was called "the father of the telephone".

He inserted a metal reed connected with a coil into his friend's mouth, and the coil connected with a wire led to another room. In fact, the metal reed plays the role of a sensor here. It is because it is connected with the coil that its vibration is converted into current. Meucci immediately realized the unusual significance of this phenomenon, and immediately began to study what he called the "talking telegraph" device.

Basic functions of telephone:

1, sound and electricity intercommunication

Because of the fast communication speed and long distance, it is impossible to transmit sound directly. We must first turn the sound into an electrical signal (that is, take electricity as the carrier), and then restore the electrical signal to sound after reaching the other party.

2. Off-hook identification

When the calling party picks up the phone, the switch should have the function of knowing that "someone wants to call" so that the switch can prepare for the connection.

Step 3: Send a signal

An automatic telephone directs the operation of the telephone exchange by sending a dialing signal, and then establishes a connection between the two telephones.