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A public address system is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music. PA systems are used in any public venue that requires that an announcer, performer, etc. be sufficiently audible at a distance or over a large area. Typical applications include sports stadiums, public transportation vehicles and facilities, and live or recorded music venues and events. A PA system may include multiple microphones or other sound sources, a mixing console to combine and modify multiple sources, and multiple amplifiers and loudspeakers for louder volume or wider distribution.
A business telephone system is a multiline telephone system typically used in business environments, encompassing systems ranging in technology from the key telephone system (KTS) to the private branch exchange (PBX).
In a theatre, the prompt corner or prompt box is the place where the prompter—usually the stage manager in the US or deputy stage manager in the UK—stands in order to coordinate the performance and to remind performers of their lines when required. It is traditionally located at stage left.
An intercom, also called an intercommunication device, intercommunicator, or interphone, is a stand-alone voice communications system for use within a building, small collection of buildings or portably within a small coverage area, which functions independently of the public telephone network. Intercoms are generally mounted permanently in buildings and vehicles, but can also be detachable and portable. Intercoms can incorporate connections to public address loudspeaker systems, walkie talkies, telephones, and other intercom systems. Some intercom systems incorporate control of devices such as signal lights and door latches.
A speaking tube or voicepipe is a device based on two cones connected by an air pipe through which speech can be transmitted over an extended distance.
The BT Ambassador is a telephone private branch exchange switchboard. Manufactured for BT by the General Electric Company, it was discontinued in 1991. There was a larger version called Senator. Both systems used proprietary phones, allowed direct access to outside lines, had an intercom facility and allowed basic call diversion. Apart from this, there were few features, and these systems are now obsolete. Ambassador systems handled 1 line & 3 extensions or 2 lines and 4 extensions, while the Senator could handle 5 lines and 10 extensions, depending on the cards in the control unit. Used Ambassador and Senator equipment is available on the second hand market in the United Kingdom. These days they could provide intercoms facilities for private homes but do not have much use in a modern office, due to lack of features and interoperability.
In residential telephony, an extension telephone is an additional telephone wired to the same telephone line as another. In middle 20th century telephone jargon, the first telephone on a line was a "Main Station" and subsequent ones "Extensions" or even called as intercom. Such extension phones allow making or receiving calls in different rooms, for example in a home, but any incoming call would ring all extensions and any one extension being in use would cause the line to be busy for all users. Some telephones intended for use as extensions have built in intercom features; a key telephone system for a small business may offer two to five lines, lamps indicating lines already in use, the ability to place calls on 'hold' and an intercom on each of the multiple extensions.
AT&T Merlin is a corporate telephone system by American Telephone and Telegraph (AT&T) that was introduced in late 1983, when it was branded American Bell Merlin. After the breakup of AT&T in 1984, it was rebranded and later also supplied by Lucent and Avaya.
The 1A2 Key Telephone System is a business telephone system developed and distributed by the Western Electric Company for the Bell System.
A wireless intercom is a telecommunications device that enables voice communication without the need to run copper wires between intercom stations. A wired intercom system may incorporate wireless elements.
Riverdale High School is a public high school on Roberts Drive in Riverdale, Georgia, United States. The school serves about 1,400 students in grades 9 to 12 in the Clayton County Public Schools district. Its current principal is Dr. Ulrica Jackson.
Mount Bethany English Medium Higher Secondary School or Kerala, India. The school began providing education to lower primary level classes in the late 1970s. Later the school added further classes and now serves classes from Kindergarten to 10+2 in accordance with the Kerala Syllabus.
A videophone is a telecommunication device that provides both live audio and video on a telephone call, letting each person see as well as talk to the other.
Wright City High School (WCHS) is a public high school in Wright City, Missouri, part of the Wright City R-II School District. It was established in 1922.
Interruptible foldback (IFB), also known as interrupted foldback, interruptible feedback, or interrupt for broadcast, is a monitoring and cueing system used in television, filmmaking, video production, and radio broadcast for one-way communication from the director or assistant director to on-air talent or a remote location. The names are backronyms for the Telex IFB-XXX model line. Less common names for the system include program cue interrupt (PCI) and switched talkback. IFB is often facilitated using an earpiece that on-air persons wear to get cues, feedback or direction from their control rooms. The earpiece itself may also be referred to as an IFB. Sometimes IFB is accomplished by the director talking to off-camera personnel who visually cue the on-camera talent.
EVNautilus is a 68-meter (223 ft) research vessel owned by the Ocean Exploration Trust under the direction of Robert Ballard, the researcher known for finding the wreck of the Titanic and the German battleship Bismarck. The vessel's home port is at the AltaSea facility in San Pedro in the Port of Los Angeles, California. Nautilus is equipped with a team of remotely operated vehicles (ROVs), Hercules, Argus, Little Hercules, and Atalanta, a multibeam mapping system, and mapping tools Diana and Echo, allowing it to conduct deep sea exploration of the ocean to a depth of 4,000 meters (13,000 ft).
MessageNet systems is a privately held company which sells a primarily software-based product called "Connections" for facilitating an organization's emergency and routine communications.
A video door-phone is a stand-alone intercom system used to manage calls made at the entrance to a building with access controlled by audiovisual communication between the inside and outside. The main feature of video door entry is that it enables the person indoors to identify the visitor and, if they wish, engage in conversation and/or open the door to allow access to the person calling.
Fermax is a company that designs, manufactures, and commercializes audio and video door entry systems and access control systems. The head office is located in the city of Valencia, Spain, where the company was founded by Fernando Maestre in 1949.
A door phone or door bell phone is a set of electrical and electronic elements used to handle communication between a resident in a house, apartment or villa and a guest outside. The device can also lock or unlock the door it has been configured to work with. Door phones have been used across a variety of commercial and residential buildings. For example, offices and apartment blocks both make frequent use of door phones. They are so widely used that, nowadays, they form part of the standard electrical installation of most buildings.
References
- ↑ Sokhail, SK (Nov 2017). "Intercom System For Short Path Communication" (PDF). International Journal for Research in Engineering Application & Management. 3 (8). Retrieved 30 June 2021.
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