Field of technology involving the development, application, and deployment of telecommunication services for the purpose of electronic transmission of voice, fax, or data, between distant parties.- Telephony
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Method used to digitally represent sampled analog signals.
It is the standard form of digital audio in computers, compact discs, digital telephony and other digital audio applications.
Transmission method of conveying information using a continuous signal which varies in amplitude, phase, or some other property in proportion to that information.
Telephony and voice communication was originally primarily analog in nature, as was most television and radio transmission.
In telephony, the local loop (also referred to as the local tail, subscriber line, or in the aggregate as the last mile) is the physical link or circuit that connects from the demarcation point of the customer premises to the edge of the common carrier or telecommunications service provider's network.
Semiconductor device used to amplify or switch electrical signals and power.
The thermionic triode, a vacuum tube invented in 1907, enabled amplified radio technology and long-distance telephony.
The public switched telephone network (PSTN) provides infrastructure and services for public telecommunication.
The PSTN is the aggregate of the world's circuit-switched telephone networks that are operated by national, regional, or local telephony operators.
Portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area.
In addition to telephony, digital mobile phones (2G) support a variety of other services, such as text messaging, MMS, email, Internet access, short-range wireless communications (infrared, Bluetooth), business applications, video games and digital photography.
Family of technologies that are used to transmit digital data over telephone lines.
It is useful when the customer does not need the traditional telephony voice service because voice service is received either on top of the DSL services (usually VoIP) or through another network (E.g., mobile telephony).
Device that stores electrical energy in an electric field.
Paper capacitors, made by sandwiching a strip of impregnated paper between strips of metal and rolling the result into a cylinder, were commonly used in the late 19th century; their manufacture started in 1876, and they were used from the early 20th century as decoupling capacitors in telephony.
Method and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet.
The steps and principles involved in originating VoIP telephone calls are similar to traditional digital telephony and involve signaling, channel setup, digitization of the analog voice signals, and encoding.
Telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly.
With the development of stored program control and MOS integrated circuits for electronic switching systems, and new transmission technologies such as pulse-code modulation (PCM), telephony gradually evolved towards digital telephony, which improved the capacity, quality, and cost of the network.