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Lip-ribbon Microphone
The lip-ribbon microphone (also known as the "commentator's lip" microphone) is a type of ribbon microphone designed specially for use by live news reporters or sports commentators. Organisations such as the BBC, CBS and ABC use lip-ribbon microphones to cover events including motor racing, wrestling, processions and demonstrations. Design Noise reduction Lip-ribbon microphones use baffles to create an acoustic labyrinth within the body of the microphone. The microphone's bi-directional polar pattern controls interference; sound from the commentator reaches one side of the ribbon more than the other, whereas sounds from other sources contact both sides of the ribbon (at a difference in phase of 180°) and cancel out. The labyrinth design also allows lip-ribbon microphones to withstand wind speeds of up to without affecting speech. This resistance can be further strengthened with the use of wind shields. Frequency response The microphone is subject to increased b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ribbon Microphone
A ribbon microphone, also known as a ribbon velocity microphone, is a type of microphone that uses a thin aluminum, duraluminum or nanofilm of electrically conductive ribbon placed between the poles of a magnet to produce a voltage by electromagnetic induction. Ribbon microphones are typically bidirectional, meaning that they pick up sounds equally well from either side of the microphone. Principle of operation In a moving-coil microphone, the diaphragm is attached to a light movable coil that generates a voltage as it moves back and forth between the poles of a permanent magnet. In ribbon microphones, a light metal ribbon (usually corrugated) is suspended between the poles of a magnet. As the ribbon vibrates, a voltage is induced at right angles to both the ribbon velocity and magnetic field direction and is picked off by contacts at the ends of the ribbon. Ribbon microphones are also called "velocity microphones" because the induced voltage is proportional to the velo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
News Reporter
A journalist is an individual that collects/gathers information in form of text, audio, or pictures, processes them into a news-worthy form, and disseminates it to the public. The act or process mainly done by the journalist is called journalism. Roles Journalists can be broadcast, print, advertising, and public relations personnel, and, depending on the form of journalism, the term ''journalist'' may also include various categories of individuals as per the roles they play in the process. This includes reporters, correspondents, citizen journalists, editors, editorial-writers, columnists, and visual journalists, such as photojournalists (journalists who use the medium of photography). A reporter is a type of journalist who researches, writes and reports on information in order to present using sources. This may entail conducting interviews, information-gathering and/or writing articles. Reporters may split their time between working in a newsroom, or from home, and going o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sports Commentator
In sports broadcasting, a sports commentator (also known as sports announcer or sportscaster) provides a real-time commentary of a game or event, usually during a live broadcast, traditionally delivered in the historical present tense. Radio was the first medium for sports broadcasts, and radio commentators must describe all aspects of the action to listeners who cannot see it for themselves. In the case of televised sports coverage, commentators are usually presented as a voiceover, with images of the contest shown on viewers' screens and sounds of the action and spectators heard in the background. Television commentators are rarely shown on screen during an event, though some networks choose to feature their announcers on camera either before or after the contest or briefly during breaks in the action. Types of commentators Main/play-by-play commentator The ''main commentator'', also called the ''play-by-play'' announcer or commentator in North America, ''blow-by-blow'' in comb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Broadcasting Company
The American Broadcasting Company (ABC) is an American commercial broadcast television network. It is the flagship property of the ABC Entertainment Group division of The Walt Disney Company. The network is headquartered in Burbank, California, on Riverside Drive, directly across the street from Walt Disney Studios and adjacent to the Roy E. Disney Animation Building. The network's secondary offices, and headquarters of its news division, are in New York City, at its broadcast center at 77 West 66th Street on the Upper West Side of Manhattan. Since 2007, when ABC Radio (also known as Cumulus Media Networks) was sold to Citadel Broadcasting, ABC has reduced its broadcasting operations almost exclusively to television. It is the fifth-oldest major broadcasting network in the world and the youngest of the American Big Three television networks. The network is sometimes referred to as the Alphabet Network, as its initialism also represents the first three letters of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Motor Racing
Motorsport, motorsports or motor sport is a global term used to encompass the group of competitive sporting events which primarily involve the use of motorized vehicles. The terminology can also be used to describe forms of competition of two-wheeled motorised vehicles under the banner of motorcycle racing, and includes off-road racing such as motocross. Four- (or more) wheeled motorsport competition is globally governed by the Fédération Internationale de l'Automobile (FIA); and the Fédération Internationale de Motocyclisme (FIM) governs two-wheeled competition. Likewise, the Union Internationale Motonautique (UIM) governs powerboat racing while the Fédération Aéronautique Internationale (FAI) governs air sports, including aeroplane racing. All vehicles that participate in motorsports must adhere to the regulations that are set out by the respective global governing body. History In 1894, a French newspaper organised a race from Paris to Rouen and back, starting ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wrestling
Wrestling is a series of combat sports involving grappling-type techniques such as clinch fighting, throws and takedowns, joint locks, pins and other grappling holds. Wrestling techniques have been incorporated into martial arts, combat sports and military systems. The sport can either be genuinely competitive or sportive entertainment (see professional wrestling). Wrestling comes in different forms such as freestyle, Greco-Roman, judo, sambo, folkstyle, catch, submission, sumo, pehlwani, shuai jiao and others. A wrestling bout is a physical competition, between two (sometimes more) competitors or sparring partners, who attempt to gain and maintain a superior position. There are a wide range of styles with varying rules, with both traditional historic and modern styles. The term ''wrestling'' is attested in late Old English, as ''wræstlunge'' (glossing ''palestram''). History Wrestling represents one of the oldest forms of combat. The origins of wrestl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Processions
A procession is an organized body of people walking in a formal or ceremonial manner. History Processions have in all peoples and at all times been a natural form of public celebration, as forming an orderly and impressive ceremony. Religious and triumphal processions are abundantly illustrated by ancient monuments, e.g. the religious processions of Egypt, those illustrated by the rock-carvings of Boghaz-Keui, the many representations of processions in Greek art, culminating in the great Panathenaic procession of the Parthenon Frieze, and Roman triumphal reliefs, such as those of the arch of Titus. Greco-Roman practice Processions played a prominent part in the great festivals of Greece, where they were always religious in character. The games were either opened or accompanied by more or less elaborate processions and sacrifices, while processions from the earliest times formed part of the worship of the old nature gods, as those connected with the cult of Dionysus and the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Demonstration (people)
A political demonstration is an action by a mass group or collection of groups of people in favor of a political or other cause or people partaking in a protest against a cause of concern; it often consists of walking in a mass march formation and either beginning with or meeting at a designated endpoint, or rally, in order to hear speakers. It is different from mass meeting. Actions such as blockades and sit-ins may also be referred to as demonstrations. Demonstrations can be nonviolent or violent (usually referred to by participants as " militant"), or can begin as nonviolent and turn violent depending on the circumstances. Sometimes riot police or other forms of law enforcement become involved. In some cases, this may be in order to try to prevent the protest from taking place at all. In other cases, it may be to prevent clashes between rival groups, or to prevent a demonstration from spreading and turning into a riot. History The term has been in use since the mid-19th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sound Baffle
A sound baffle is a construction or device which reduces the strength (level) of airborne sound. Sound baffles are a fundamental tool of noise mitigation, the practice of minimizing noise pollution or reverberation. An important type of sound baffle is the noise barrier constructed along highways to reduce sound levels at properties in the vicinity. Sound baffles are also applied to walls and ceilings in building interiors to absorb sound energy and thus lessen reverberation. Highway noise barriers The technology for accurate prediction of the effects of noise barrier design using a computer model to analyze roadway noise has been available since the early 1970s. The earliest published scientific design of a noise barrier may have occurred in Santa Clara County, California in 1970 for a section of the Foothill Expressway in Los Altos, California. The county used a computer model to predict the effects of sound propagation from roadways, with variables consisting of vehicle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microphone
A microphone, colloquially called a mic or mike (), is a transducer that converts sound into an electrical signal. Microphones are used in many applications such as telephones, hearing aids, public address systems for concert halls and public events, motion picture production, live and recorded audio engineering, sound recording, two-way radios, megaphones, and radio and television broadcasting. They are also used in computers for recording voice, speech recognition, VoIP, and for other purposes such as ultrasonic sensors or knock sensors. Several types of microphone are used today, which employ different methods to convert the air pressure variations of a sound wave to an electrical signal. The most common are the dynamic microphone, which uses a coil of wire suspended in a magnetic field; the condenser microphone, which uses the vibrating diaphragm as a capacitor plate; and the contact microphone, which uses a crystal of piezoelectric material. Microphones typically n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Interference (wave Propagation)
In physics, interference is a phenomenon in which two waves combine by adding their displacement together at every single point in space and time, to form a resultant wave of greater, lower, or the same amplitude. Constructive and destructive interference result from the interaction of waves that are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly the same frequency. Interference effects can be observed with all types of waves, for example, light, radio, acoustic, surface water waves, gravity waves, or matter waves. Etymology The word ''interference'' is derived from the Latin words ''inter'' which means "between" and ''fere'' which means "hit or strike", and was coined by Thomas Young in 1801. Mechanisms The principle of superposition of waves states that when two or more propagating waves of the same type are incident on the same point, the resultant amplitude at that point is equal to th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pressure Gradient
In atmospheric science, the pressure gradient (typically of Earth's atmosphere, air but more generally of any fluid) is a physical quantity that describes in which direction and at what rate the pressure increases the most rapidly around a particular location. The pressure gradient is a dimensional quantity expressed in units of pascal (unit), pascals per metre (Pa/m). Mathematically, it is the gradient of pressure as a function of position. The negative gradient of pressure is known as the force density. In petroleum geology and the petrochemical sciences pertaining to oil wells, and more specifically within hydrostatics, pressure gradients refer to the gradient of vertical pressure in a column of fluid within a wellbore and are generally expressed in pounds per square inch per foot (unit), foot (psi/ft). This column of fluid is subject to the compound pressure gradient of the overlying fluids. The path and geometry of the column is totally irrelevant; only the vertical depth of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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