What is the hotline number for Benxi Changxue?

4899502.

Telephone [English: Telephone, from the Greek τ?λε (tēle, meaning "far") and φων? (phōnē, meaning "sound"), the old translation telephony] is a A remote communications device capable of transmitting and receiving sound. As early as the 18th century, the word "telephone" existed in Europe, which was used to refer to a microphone strung with wires (cups strung with wires).

The emergence of the telephone is attributed to Alexander Graham Bell. The principle of early telephones is: the sound of speech is a composite vibration in the air, which can be transmitted to a solid body and passed through electrical pulses to conductive metals. transfer. Bell applied for a patent for the telephone in March 1876.

Working principle

Telephone communication is a communication technology that converts sound energy and electrical energy into each other and uses the medium of "electricity" to transmit language. The simplest form for two users to communicate is to connect two telephone sets with a pair of lines.

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.

Sound waves act on the microphone, causing it to generate current, which is called voice current.

The voice current is transmitted along the line to the receiver of the other party's telephone set.

The function of the receiver is exactly the opposite of that of the transmitter - converting the current into sound waves and transmitting them to the human ear through the air.

In this way, the simplest call process is completed.