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Since the s, television has been the main medium for molding public opinion. In recent years, Internet television has seen the rise of television available via the Internet through services such as iPlayer and Hulu.

CHEMISTRY German-English Dictionary

Although other forms such as closed-circuit television CCTV are in use, the most common usage of the medium is for broadcast television , which was modeled on the existing radio broadcasting systems developed in the s, and uses high-powered radio-frequency transmitters to broadcast the television signal to individual TV receivers. The broadcast television system is typically disseminated via radio transmissions on designated channels in the 54— MHz frequency band. Until the s, broadcast TV programs were generally transmitted as an analog television signal but during the decade several countries went almost exclusively digital.

A standard television set comprises multiple internal electronic circuits , including those for receiving and decoding broadcast signals. A visual display device which lacks a tuner is properly called a video monitor , rather than a television. Television systems are also used for surveillance, industrial process control, and guiding of weapons, in places where direct observation is difficult or dangerous.

Some studies have found a link between infancy exposure to television and ADHD. In its early stages of development, television employed a combination of optical , mechanical and electronic technologies to capture, transmit and display a visual image. By the late s, however, those employing only optical and electronic technologies were being explored. All modern television systems relied on the latter, although the knowledge gained from the work on electromechanical systems was crucial in the development of fully electronic television. The first images transmitted electrically were sent by early mechanical fax machines, including the pantelegraph , developed in the late nineteenth century.

The concept of electrically powered transmission of television images in motion was first sketched in as the telephonoscope , shortly after the invention of the telephone. At the time, it was imagined by early science fiction authors, that someday that light could be transmitted over copper wires, as sounds were. The idea of using scanning to transmit images was put to actual practical use in in the pantelegraph, through the use of a pendulum -based scanning mechanism.

From this period forward, scanning in one form or another has been used in nearly every image transmission technology to date, including television. This is the concept of " rasterization ", the process of converting a visual image into a stream of electrical pulses.

In , Paul Gottlieb Nipkow , a year-old university student in Germany , [ 5 ] patented the first electromechanical television system which employed a scanning disk , a spinning disk with a series of holes spiraling toward the center, for rasterization. The holes were spaced at equal angular intervals such that, in a single rotation, the disk would allow light to pass through each hole and onto a light-sensitive selenium sensor which produced the electrical pulses. As an image was focused on the rotating disk, each hole captured a horizontal "slice" of the whole image.

Nipkow's design would not be practical until advances in amplifier tube technology became available. Later designs would use a rotating mirror-drum scanner to capture the image and a cathode ray tube CRT as a display device, but moving images were still not possible, due to the poor sensitivity of the selenium sensors. In , Russian scientist Boris Rosing became the first inventor to use a CRT in the receiver of an experimental television system. He used mirror-drum scanning to transmit simple geometric shapes to the CRT.

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Using a Nipkow disk, Scottish inventor John Logie Baird succeeded in demonstrating the transmission of moving silhouette images in London in , [ 8 ] and of moving, monochromatic images in Baird's scanning disk produced an image of 30 lines resolution, just enough to discern a human face, from a double spiral of Photographic lenses. Remarkably, in , Baird also invented the world's first video recording system, " Phonovision ": by modulating the output signal of his TV camera down to the audio range, he was able to capture the signal on a inch wax audio disc using conventional audio recording technology.

A handful of Baird's 'Phonovision' recordings survive and these were finally decoded and rendered into viewable images in the s using modern digital signal-processing technology. Takayanagi did not apply for a patent. In , Philo Farnsworth made the world's first working television system with electronic scanning of both the pickup and display devices, [ 18 ] which he first demonstrated to the press on 1 September WRGB claims to be the world's oldest television station , tracing its roots to an experimental station founded on 13 January , broadcasting from the General Electric factory in Schenectady, NY , under the call letters W2XB.

The two stations were experimental in nature and had no regular programming, as receivers were operated by engineers within the company. The image of a Felix the Cat doll, rotating on a turntable, was broadcast for 2 hours every day for several years, as new technology was being tested by the engineers. At the Berlin Radio Show in August , Manfred von Ardenne gave the world's first public demonstration of a television system using a cathode ray tube for both transmission and reception.

The world's first electronically scanned television service then started in Berlin in In August , the Olympic Games in Berlin were carried by cable to television stations in Berlin and Leipzig where the public could view the games live. In , the German firm of Fernseh A.

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On 2 November , the BBC began transmitting the world's first public regular high-definition service from the Victorian Alexandra Palace in north London. Although television became more familiar in the United States with the general public at the World's Fair , the outbreak of World War II prevented it from being manufactured on a large scale until after the end of the war. True regular commercial television network programming did not begin in the U. Amateur television ham TV or ATV was developed for non-commercial experimentation, pleasure and public service events by amateur radio operators.

Ham TV stations were on the air in many cities before commercial TV stations came on the air. In , it was reported that television revenue was growing faster than film for major media companies. Getting TV programming shown to the public can happen in many different ways. After production, the next step is to market and deliver the product to whatever markets are open to using it. This typically happens on two levels:. First run programming is increasing on subscription services outside the U.

This practice is increasing however, generally on digital-only FTA channels, or with subscriber-only first-run material appearing on FTA. Unlike the U. Also, affiliates rarely buy or produce non-network programming that is not centred around local programming. Around the globe, broadcast television is financed by either government, advertising, licensing a form of tax , subscription or any combination of these. To protect revenues, subscription TV channels are usually encrypted to ensure that only subscription payers receive the decryption codes to see the signal.

Unencrypted channels are known as free to air or FTA. In , the global TV market represented 1, Television's broad reach makes it a powerful and attractive medium for advertisers. Many television networks and stations sell blocks of broadcast time to advertisers "sponsors" in order to fund their programming.


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Since inception in the U. During the s and into the s, programs were hosted by single advertisers.

This, in turn, gave great creative license to the advertisers over the content of the show. Perhaps due to the quiz show scandals in the s, [ 37 ] networks shifted to the magazine concept introducing advertising breaks with multiple advertisers. The time of the day and popularity of the channel determine how much a television commercial can cost. Conversely, lesser-viewed time slots , such as early mornings and weekday afternoons, are often sold in bulk to producers of infomercials , at far lower rates.

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In recent years, the paid program or infomercial has become common, usually in lengths of 30 minutes or one hour. Some drug companies and other businesses have even created "news" items for broadcast, known in the industry as video news releases , paying program directors to use them. Some TV programs also weave advertisements into their shows, a practice begun in film [ 39 ] and known as product placement.

For example, a character could be drinking a certain kind of soda, going to a particular chain restaurant , or driving a certain make of car. This is sometimes very subtle, where shows have vehicles provided by manufacturers for low cost, rather than wrangling them. Sometimes, a specific brand or trade mark , or music from a certain artist or group, is used. This excludes guest appearances by artists, who perform on the show. Its restrictions have applied since the early days of commercially funded TV. Despite this, an early TV mogul, Roy Thomson , likened the broadcasting licence as being a "licence to print money".

Other broadcasters must average no more than nine minutes twelve in the peak. This means that many imported TV shows from the US have unnatural pauses where the UK company does not utilize the narrative breaks intended for more frequent US advertising. Advertisements must not be inserted in the course of certain specific proscribed types of programs which last less than half an hour in scheduled duration; this list includes any news or current affairs program, documentaries, and programs for children.

Nor may advertisements be carried in a program designed and broadcast for reception in schools or in any religious broadcasting service or other devotional program, or during a formal Royal ceremony or occasion. There also must be clear demarcations in time between the programs and the advertisements.

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The BBC , being strictly non-commercial is not allowed to show advertisements on television in the UK, although it has many advertising-funded channels abroad. The majority of its budget comes from television license fees see below and broadcast syndication , the sale of content to other broadcasters. Advertising is found on both private and state owned broadcasters. There are some restrictions based on advertising, especially in relation to the advertising of alcohol. Broadcasters in Ireland adhere to broadcasting legislation implemented by the Broadcasting Commission of Ireland and the European Union.

Sponsorship of current affairs programming is prohibited at all times. Television services in some countries may be funded by a television licence or a form of taxation which means advertising plays a lesser role or no role at all. For example, some channels may carry no advertising at all and some very little, including:. The BBC carries no television advertising on its UK channels and is funded by an annual television Licence paid by premises receiving live TV broadcasts.


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Currently, it is estimated that approximately The two main BBC TV channels are watched by almost 90 percent of the population each week and overall have 27 per cent share of total viewing. When the same sporting event has been presented on both BBC and commercial channels, the BBC always attracts the lion's share of the audience , indicating viewers prefer to watch TV uninterrupted by advertising. However funded by the Australian Government the editorial independence of the ABC is ensured through law. In France, government-funded channels carry advertisements yet those who own television sets have to pay an annual tax "la redevance audiovisuelle".

The fee is standardized, with discounts for office workers and students who commute, as well a general discount for residents of Okinawa prefecture. Some TV channels are partly funded from subscriptions therefore the signals are encrypted during broadcast to ensure that only the paying subscribers have access to the decryption codes to watch pay television or specialty channels. Most subscription services are also funded by advertising. Television genres include a broad range of programming types that entertain, inform, and educate viewers. The most expensive entertainment genres to produce are usually drama and dramatic miniseries.

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