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  2. Tally light - Wikipedia

    en.wikipedia.org/wiki/Tally_light

    In a television studio, a tally light (or on air indicator) is a small signal lamp on a professional video camera or monitor. It is usually located just above the lens or on the electronic viewfinder (EVF) and communicates, for the benefit of those in front of the camera as well as the camera operator , that the camera is live (i.e. its signal ...

  3. Videotelephony - Wikipedia

    en.wikipedia.org/wiki/Videotelephony

    The movie was released shortly before AT&T began its efforts to commercialize its Picturephone Mod II service in several cities and depicts a video call to Earth using an advanced AT&T videophone—which it predicts will cost $1.70 for a two-minute call in 2001 (a fraction of the company's real rates on Earth in 1968).

  4. Off-hook tone - Wikipedia

    en.wikipedia.org/wiki/Off-hook_tone

    The signal is applied to the local loop by the switching system for permanent signal treatment to alert an end user (subscriber) of an off-hook condition of the telephone set, i.e. that the telephone handset should be placed on-hook. Before playing the signal, a certain timeout has to elapse, and on some systems an intercept message is ...

  5. Video modulation - Wikipedia

    en.wikipedia.org/wiki/Video_modulation

    Video signals are usually encoded into binary digit (0, 1) or seven digit pulse-code modulation (PCM), which is a method used to digitally represent original video signal. . The video signal converted to binary digit PCM at the point of origin can be then transmitted over existing telephone cable or wire directly to the destination

  6. Line signaling - Wikipedia

    en.wikipedia.org/wiki/Line_signaling

    Line signaling is a class of telecommunications signaling protocols. [1] Line signaling is responsible for off-hook , ringing signal , answer, ground start , on-hook unidirectional supervision messaging in each direction from calling party to called party and vice versa.

  7. Billy Joel Announces ‘Turn the Lights Back On,’ His First ...

    www.aol.com/billy-joel-announces-turn-lights...

    Billy Joel is back with new music for the first time in 17 years. The singer-songwriter has announced the release of “Turn the Lights Back On,” his first solo song since 2007 and second since ...

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  9. Comparison of user features of messaging platforms - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_user...

    Skype is a proprietary telecommunications application that specializes in providing video chat and voice calls between computers, tablets, mobile devices, the Xbox One console, and smartwatches over the Internet. Skype also provides instant messaging services. Users may transmit text, video, audio and images.