HOME TheInfoList.com
Providing Lists of Related Topics to Help You Find Great Stuff
[::MainTopicLength::#1500] [::ListTopicLength::#1000] [::ListLength::#15] [::ListAdRepeat::#3]

picture info

When Will You (Make My Telephone Ring)
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. Telephones rapidly became indispensable to businesses, government, and households, and are today some of the most widely used small appliances
[...More...]

"When Will You (Make My Telephone Ring)" on:
Wikipedia
Google
Yahoo

picture info

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 canceling out electromagnetic interference (EMI) from external sources; for instance, electromagnetic radiation from unshielded twisted pair (UTP) cables, and crosstalk between neighboring pairs. It was invented by Alexander Graham Bell
Alexander Graham Bell
. CONTENTS * 1 Explanation * 2 History * 3 Unshielded twisted pair (UTP) * 4 Cable shielding * 5 Common types * 6 Solid-core cable vs. stranded cable * 7 Advantages * 8 Disadvantages * 9 Less common variants * 10 See also * 11 References * 12 External links EXPLANATIONIn balanced pair operation, the two wires carry equal and opposite signals, and the destination detects the difference between the two. This is known as differential mode transmission
[...More...]

"Twisted Pair" on:
Wikipedia
Google
Yahoo

Plain Old Telephone Service
PLAIN OLD TELEPHONE SERVICE (POTS) is a retronym for voice-grade telephone service employing analog signal transmission over copper loops. POTS was the standard service offering from telephone companies from 1876 until 1988 when the now-obsolete 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. The term reflects the technology that has been available since the introduction of the public telephone system in the late 19th century, in a form mostly unchanged despite the introduction of Touch-Tone dialing, electronic telephone exchanges and fiber-optic communication into the public switched telephone network (PSTN)
[...More...]

"Plain Old Telephone Service" on:
Wikipedia
Google
Yahoo

picture info

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. 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
[...More...]

"Push-button Telephone" on:
Wikipedia
Google
Yahoo

picture info

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. 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. Both man-made and natural sources generate changing electrical currents and voltages that can cause EMI: automobile ignition systems, mobile phones, thunderstorms, the Sun
Sun
, and the Northern Lights . EMI frequently affects AM radios . It can also affect mobile phones , FM radios , and televisions , as well as observations for radio astronomy . EMI can be used intentionally for radio jamming , as in electronic warfare
[...More...]

"Electromagnetic Interference" on:
Wikipedia
Google
Yahoo

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. CONTENTS * 1 Telephony * 2 Radiotelegraphy * 3 Aviation * 4 Public address systems * 5 See also * 6 References TELEPHONYIn 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
[...More...]

"Sidetone" on:
Wikipedia
Google
Yahoo

picture info

Virtual Reality
VIRTUAL REALITY (VR) is a computer technology that uses Virtual reality headsets , sometimes in combination with physical spaces or multi-projected environments, 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, and with high quality VR move about in it and interact with virtual features or items. VR headsets are head-mounted goggles with a screen in front of the eyes. Programs may include audio and sounds through speakers or headphones. VR systems that include transmission of vibrations and other sensations to the user through a game controller or other devices are known as haptic systems. This tactile information is generally known as force feedback in medical, video gaming and military training applications
[...More...]

"Virtual Reality" on:
Wikipedia
Google
Yahoo

picture info

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. 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. 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. Mathematically, turn by turn navigation is based on the shortest path problem within graph theory , which examines how to identify the path that best meets some criteria (shortest, cheapest, fastest, etc) between two points in a large network. A TomTom device DEVICES AND SERVICESMajor mapping services that offer turn-by-turn navigation, grouped by map data provider: * Nokia Maps
[...More...]

"Turn-by-turn Navigation" on:
Wikipedia
Google
Yahoo

picture info

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. 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. 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 physicially manipulating objects). Videoconferencing
Videoconferencing
has also been called "visual collaboration" and is a type of groupware
[...More...]

"Videotelephony" on:
Wikipedia
Google
Yahoo

picture info

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
[...More...]

"Video Game" on:
Wikipedia
Google
Yahoo

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
JavaScript
, and Ajax . Websites designed for access from these browsers are referred to as wireless portals or collectively as the Mobile Web
Mobile Web
. They may automatically create "mobile" versions of each page, for example this one
[...More...]

"Mobile Browser" on:
Wikipedia
Google
Yahoo

picture info

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. These formats include transmission lines and waveguides
[...More...]

"Hybrid Coil" on:
Wikipedia
Google
Yahoo

picture info

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 in which a form of energy, not necessarily electrical, is transferred between a source and a load
[...More...]

"Impedance Matching" on:
Wikipedia
Google
Yahoo

Dial Tone
A DIAL TONE is a telephony signal sent by a telephone exchange or private branch exchange (PBX) to a terminating device, such as a telephone, when an off-hook condition is detected. It indicates that the exchange is working and is ready to initiate a telephone call . The tone stops when the first dialed digit is recognized. If no digits are forthcoming, the permanent signal procedure is invoked, often eliciting a special information tone and an intercept message , followed by the off-hook tone , requiring the caller to hang up and redial. CONTENTS * 1 History * 2 Variants * 2.1 Second dial tone * 2.2 Secondary dial tone * 2.3 Stutter dial tone * 2.4 Soft dial tones * 3 See also * 4 References HISTORY Example of a North American dial tone Listen to a dial tone from North America
[...More...]

"Dial Tone" on:
Wikipedia
Google
Yahoo

picture info

Direct Current
DIRECT CURRENT (DC) is the unidirectional flow of electric charge . A battery is a good example of a DC power supply. Direct current
Direct current
may flow in a conductor such as a wire, but can also flow through semiconductors , insulators , or even through a vacuum as in electron or ion beams . The electric current flows in a constant direction, distinguishing it from alternating current (AC). A term formerly used for this type of current was GALVANIC CURRENT. The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage . Direct current
Direct current
may be obtained from an alternating current supply by use of a rectifier , which contains electronic elements (usually) or electromechanical elements (historically) that allow current to flow only in one direction
[...More...]

"Direct Current" on:
Wikipedia
Google
Yahoo
.