Telephone
Telephone
Telephone (pronunciation: /ˈtɛlɪfoʊn/) is a device that permits two or more users to conduct a conversation when they are too far apart to be heard directly.
Etymology
The term "telephone" comes from the Greek words tēle (τῆλε), meaning "far", and phōnē (φωνή), meaning "voice". Thus, a telephone is a device that transmits voice over a distance.
History
The telephone was invented by Alexander Graham Bell in the 19th century. The first successful bi-directional transmission of clear speech by Bell and his assistant Thomas Watson occurred on March 10, 1876.
Function
A telephone converts sound, typically and most efficiently the human voice, into electronic signals suitable for transmission via cables or other transmission media over long distances, and replays such signals simultaneously in audible form to its user.
Related Terms
- Landline: A phone that uses a metal wire or optical fiber telephone line for transmission.
- Mobile phone: A portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area.
- Smartphone: A mobile device that combines cellular and mobile computing functions into one unit. They are distinguished from feature phones by their stronger hardware capabilities and extensive mobile operating systems.
- VoIP: Voice over Internet Protocol, also called IP telephony, is a method and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet.
External links
- Medical encyclopedia article on Telephone
- Wikipedia's article - Telephone
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