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Telephone Numbers In England
A telephone, or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly. A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables and other communication channels to another telephone which reproduces the sound to the receiving user. In 1876, Scottish emigrant Alexander Graham Bell
Alexander Graham Bell
was the first to be granted a United States patent for a device that produced clearly intelligible replication of the human voice. This instrument was further developed by many others. The telephone was the first device in history that enabled people to talk directly with each other across large distances
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Telephone (other)
A telephone is a telecommunication device which is used to transmit and receive sound simultaneously. Telephone
Telephone
may also refer to:Contents1 Telecommunications 2 Music, film and the arts 3 Other uses 4 See alsoTelecommunications[edit]Camera phone, a mobile phone that is also able to capture either still photographs or video be Cordless telephone, a telephone with a wireless handset that communicates via radio waves to its base station Mobile phone, a wireless telecommunications device used for phone and data calls over a cellular network
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Hybrid Coil
A hybrid coil (or bridge transformer, or sometimes hybrid) is a transformer that has three windings, and which is designed to be configured as a circuit having four ports that are conjugate in pairs. A signal arriving at one port is divided equally between the two adjacent ports but does not appear at the opposite port. In the schematic diagram, the signal into W splits between X and Z, and no signal passes to Y. Similarly, signals into X split to W and Y with none to Z, etc. Correct operation requires matched characteristic impedance at all four ports. Hybrids are a class of directional coupler in which the input port power is split equally between the two output ports. Forms of hybrid other than transfomer coils are possible; any format of directional coupler can be designed to be a hybrid
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Videotelephony
Videotelephony
Videotelephony
comprises the technologies for the reception and transmission of audio-video signals by users at different locations, for communication between people in real-time.[1] A videophone is a telephone with a video display, capable of simultaneous video and audio for communication between people in real-time. Videoconferencing implies the use of this technology for a group or organizational meeting rather than for individuals, in a videoconference.[2] Telepresence
Telepresence
may refer either to a high-quality videotelephony system (where the goal is to create the illusion that remote participants are in the same room) or to meetup technology which goes beyond video into robotics (such as moving around the room or physically manipulating objects)
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Video Game
A video game is an electronic game that involves interaction with a user interface to generate visual feedback on a video device such as a TV screen or computer monitor. The word video in video game traditionally referred to a raster display device, but as of the 2000s, it implies any type of display device that can produce two- or three-dimensional images. Some theorists categorize video games as an art form, but this designation is controversial. The electronic systems used to play video games are known as platforms; examples of these are personal computers and video game consoles. These platforms range from large mainframe computers to small handheld computing devices
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Mobile Browser
A mobile browser is a web browser designed for use on a mobile device such as a mobile phone or PDA. Mobile browsers are optimized so as to display Web content most effectively for small screens on portable devices. Mobile browser software must be small and efficient to accommodate the low memory capacity and low-bandwidth of wireless handheld devices. Typically they were stripped-down web browsers, but some more modern mobile browsers can handle more recent technologies like CSS 2.1, JavaScript, and Ajax. Websites designed for access from these browsers are referred to as wireless portals[1] or collectively as the Mobile Web
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Turn-by-turn Navigation
Turn-by-turn Navigation is a feature of some GPS navigation devices where directions for a selected route are continually presented to the user in the form of spoken and visual instructions.[1] The system keeps the user up-to-date about the best route to the destination, and is often updated according to changing factors such as traffic and road conditions.[2] Turn-by-turn systems typically use an electronic voice to inform the user whether to turn left or right, the street name, and how much distance to the turn
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Virtual Reality
Virtual reality
Virtual reality
(VR) is a computer-generated scenario that simulates a realistic experience. The immersive environment can be similar to the real world in order to create a lifelike experience grounded in reality or sci-fi. Augmented reality
Augmented reality
systems may also be considered a form of VR that layers virtual information over a live camera feed into a headset, or through a smartphone or tablet device. Current VR technology most commonly uses virtual reality headsets or multi-projected environments, sometimes in combination with physical environments or props, to generate realistic images, sounds and other sensations that simulate a user's physical presence in a virtual or imaginary environment. A person using virtual reality equipment is able to "look around" the artificial world, move around in it, and interact with virtual features or items
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Plain Old Telephone Service
Plain old telephone service or plain ordinary telephone service (POTS) is a retronym for voice-grade telephone service employing analog signal transmission over copper loops.[1] POTS was the standard service offering from telephone companies from 1876 until 1988[2] when the Integrated Services Digital Network
Integrated Services Digital Network
(ISDN) Basic Rate Interface (BRI) was introduced, followed by cellular telephone systems, and voice over IP (VoIP). POTS remains the basic form of residential and small business service connection to the telephone network in many parts of the world
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Twisted Pair
Twisted pair
Twisted pair
cabling is a type of wiring in which two conductors of a single circuit are twisted together for the purposes of improving electromagnetic compatibility. Compared to a single conductor or an untwisted balanced pair, a twisted pair reduces electromagnetic radiation, crosstalk between neighboring pairs and improves rejection of external electromagnetic interference. It was invented by Alexander Graham Bell.[1]Contents1 Explanation 2 History 3 Unshielded twisted pair 4 Cable shielding 5 Common types5.1 Analog telephone 5.2 Building infrastructure6 Solid-core cable vs. stranded cable 7 Advantages 8 Disadvantages 9 Less common variants 10 See also 11 References 12 External linksExplanation[edit] In a balanced line, the two wires carry equal and opposite signals, and the destination detects the difference between the two. This is known as differential signaling
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Push-button Telephone
The push-button telephone is a telephone that has electronic buttons or keys for dialing a telephone number. This phone was easier and quicker to use than the rotary dial phone because the caller pressed buttons rather than having to turn a dial. Western Electric
Western Electric
experimented as early as 1941 with methods of using mechanically activated reeds to produce two tones for each of the ten digits and by the late 1940s such technology was field-tested in a No. 5 Crossbar switching system in Pennsylvania.[1][2] But the technology proved unreliable and it was not until long after the invention of the transistor when push-button technology matured. On 18 November 1963, after approximately three years of customer testing, the Bell System in the United States officially introduced dual-tone multi-frequency (DTMF) technology under its registered Touch-Tone mark
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Electromagnetic Interference
Electromagnetic interference
Electromagnetic interference
(EMI), also called radio-frequency interference (RFI) when in the radio frequency spectrum, is a disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction.[1] The disturbance may degrade the performance of the circuit or even stop it from functioning. In the case of a data path, these effects can range from an increase in error rate to a total loss of the data.[2] Both man-made and natural sources generate changing electrical currents and voltages that can cause EMI: ignition systems, cellular network of mobile phones, lightning, solar flares, and auroras (Northern/Southern Lights)
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Sidetone
Sidetone is audible feedback to someone speaking when using a handset or headset as an indication of an active transmission. The term is often used in the telecommunication field.Contents1 Telephony 2 Radiotelegraphy 3 Aviation 4 Public address systems 5 See also 6 ReferencesTelephony[edit] In telephony, sidetone is the effect of sound picked up by the telephone's transmitter (mouthpiece) and instantly introduced at a low electronic signal level into the receiver (earpiece) of the same handset, a form of feedback. Sidetone in 19th century telephones varied until the carbon transmitter was used, which produced a distinct sidetone that discouraged speaking loudly enough, and occasionally so loud as to cause the instrument to produce uncontrolled oscillations, resulting in howling audio effects. Sidetone is disabled when phones of any kind are running in speakerphone mode, due to perpetual and almost immediate feedback
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Impedance Matching
In electronics, impedance matching is the practice of designing the input impedance of an electrical load or the output impedance of its corresponding signal source to maximize the power transfer or minimize signal reflection from the load. In the case of a complex source impedance ZS and load impedance ZL, maximum power transfer is obtained when Z S = Z L ∗ displaystyle Z_ mathrm S =Z_ mathrm L ^ * , where the asterisk indicates the complex conjugate of the variable. Where ZS represents the characteristic impedance of a transmission line, minimum reflection is obtained when Z S = Z L displaystyle Z_ mathrm S =Z_ mathrm L , The concept of impedance matching found first applications in electrical engineering, but is relevant in other applications
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Text Messaging
Text messaging, or texting, is the act of composing and sending electronic messages, typically consisting of alphabetic and numeric characters, between two or more users of mobile phones, tablets, desktops/laptops, or other devices. Text messages may be sent over a cellular network, or may also be sent via an Internet
Internet
connection. The term originally referred to messages sent using the Short Message Service (SMS). It has grown beyond alphanumeric text to include multimedia messages (known as MMS) containing digital images, videos, and sound content, as well as ideograms known as emoji (happy faces, sad faces, and other icons). As of 2017, text messages are used by youth and adults for personal, family and social purposes and in business. Governmental and non-governmental organizations use text messaging for communication between colleagues
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Galvanic Corrosion
Galvanic corrosion
Galvanic corrosion
(also called bimetallic corrosion) is an electrochemical process in which one metal corrodes preferentially when it is in electrical contact with another, in the presence of an electrolyte. A similar galvanic reaction is exploited in primary cells to generate a useful electrical voltage to power portable devices.Contents1 Overview 2 Examples of corrosion2.1 Statue of Liberty 2.2 Royal Navy and HMS Alarm 2.3 US Navy Littoral Combat Ship Independence 2.4 Corroding lighting fixtures 2.5 Lasagna
Lasagna
cell 2.6 Electrolytic cleaning3 Preventing galvanic corrosion 4 Galvanic series 5 Anodic index 6 See also 7 References 8 External linksOverview[edit] Dissimilar metals and alloys have different electrode potentials, and when two or more come into contact in an electrolyte, one metal acts as anode and the other as cathode
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