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2. History of videotelephony - Wikipedia

   en.wikipedia.org/wiki/History_of_videotelephony

   By 1930, AT&T's "two-way television-telephone" system was in full-scale experimental use. [7] [20] The Bell Labs' Manhattan facility devoted years of research to it during the 1930s, led by Dr. Herbert Ives along with his team of more than 200 scientists, engineers and technicians, intending to develop it for both telecommunication and broadcast entertainment purposes.

3. Two-way television - Wikipedia

   en.wikipedia.org/wiki/Two-way_television

   Two-way television. Two-way television can refer to: an early name (one of more than a dozen different ones) used for videophones during the period of the 1920s to the 1960s, a name commonly used for interactive television. Less commonly, it can also refer to: Closed-circuit television. Categories: Disambiguation pages. Videotelephony.

4. Duplex (telecommunications) - Wikipedia

   en.wikipedia.org/wiki/Duplex_(telecommunications)

   Duplex (telecommunications) A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions. Duplex systems are employed in many communications networks, either to allow for simultaneous communication in both directions between two connected ...

5. Videotelephony - Wikipedia

   en.wikipedia.org/wiki/Videotelephony

   Videotelephony (also known as videoconferencing or video call) is the use of audio and video for simultaneous two-way communication. [1] There are many terms to refer to videotelephony. Videophones are standalone devices for video calling (compare Telephone ). In the present day, devices like smartphones and computers are capable of video ...

6. Two-way communication - Wikipedia

   en.wikipedia.org/wiki/Two-way_communication

   Two-way communication involves feedback from the receiver to the sender. This allows the sender to know the message was received accurately by the receiver. One person is the sender, which means they send a message to another person via face to face, email, telephone, etc. The other person is the receiver, which means they are the one getting ...

7. Cable television in the United States - Wikipedia

   en.wikipedia.org/wiki/Cable_television_in_the...

   Cable television first became available in the United States in 1948. [1] By 1989, 53 million U.S. households received cable television subscriptions, [2] with 60 percent of all U.S. households doing so in 1992. [3] Most cable viewers in the U.S. reside in the suburbs and tend to be middle class; [4] cable television is less common in low ...

8. Telescreen - Wikipedia

   en.wikipedia.org/wiki/Telescreen

   Telescreen. Telescreens are two-way video devices that appear in George Orwell 's dystopian 1949 novel Nineteen Eighty-Four. Omnipresent and almost never turned off, they are an unavoidable source of propaganda and tools of surveillance. The concept of the telescreen has been explored as a metaphor or allegory for the erosion of privacy in ...

9. Two-way radio - Wikipedia

   en.wikipedia.org/wiki/Two-way_radio

   A two-way radio is a radio transceiver (a radio that can both transmit and receive radio waves ), which is used for bidirectional person-to-person voice communication with other users with similar radios, [1] in contrast to a broadcast receiver, which only receives transmissions. Two-way radios usually use a half-duplex communication channel ...