125-879: Doordarshan (abbreviated as DD ; lit. ' distant vision, television ' ) is an Indian state-owned public television broadcaster founded by the Government of India , owned by the Ministry of Information and Broadcasting and one of Prasar Bharati 's two divisions. As one of India's largest broadcasting organisations in studio and transmitter infrastructure, it was established on 15 September 1959. Doordarshan, which also broadcasts on digital terrestrial transmitters, provides television, radio , online and mobile services throughout metropolitan and regional India and overseas. The channel began modestly as an experimental broadcaster in Delhi on 15 September 1959, with
250-458: A patent interference suit against Farnsworth. The U.S. Patent Office examiner disagreed in a 1935 decision, finding priority of invention for Farnsworth against Zworykin. Farnsworth claimed that Zworykin's 1923 system could not produce an electrical image of the type to challenge his patent. Zworykin received a patent in 1928 for a color transmission version of his 1923 patent application. He also divided his original application in 1931. Zworykin
375-478: A resolution that is substantially higher. HDTV may be transmitted in different formats: 1080p , 1080i and 720p . Since 2010, with the invention of smart television , Internet television has increased the availability of television programs and movies via the Internet through streaming video services such as Netflix, Amazon Prime Video , iPlayer and Hulu . In 2013, 79% of the world's households owned
500-618: A transistor -based UHF tuner . The first fully transistorized color television in the United States was the Quasar television introduced in 1967. These developments made watching color television a more flexible and convenient proposition. In 1972, sales of color sets finally surpassed sales of black-and-white sets. Color broadcasting in Europe was not standardized on the PAL format until
625-467: A tuner for receiving and decoding broadcast signals. A visual display device that lacks a tuner is correctly called a video monitor rather than a television. The television broadcasts are mainly a simplex broadcast meaning that the transmitter cannot receive and the receiver cannot transmit. The word television comes from Ancient Greek τῆλε (tele) 'far' and Latin visio 'sight'. The first documented usage of
750-483: A 1925 demonstration, the image was dim, had low contrast and poor definition, and was stationary. Zworykin's imaging tube never got beyond the laboratory stage. However, RCA, which acquired the Westinghouse patent, asserted that the patent for Farnsworth's 1927 image dissector was written so broadly that it would exclude any other electronic imaging device. Thus, based on Zworykin's 1923 patent application, RCA filed
875-403: A 2-inch-wide by 2.5-inch-high screen (5 by 6 cm). The large receiver had a screen 24 inches wide by 30 inches high (60 by 75 cm). Both sets could reproduce reasonably accurate, monochromatic, moving images. Along with the pictures, the sets received synchronized sound. The system transmitted images over two paths: first, a copper wire link from Washington to New York City, then
1000-402: A TV system with a 40-line resolution that employed a CRT display. This was the first working example of a fully electronic television receiver and Takayanagi's team later made improvements to this system parallel to other television developments. Takayanagi did not apply for a patent. In the 1930s, Allen B. DuMont made the first CRTs to last 1,000 hours of use, one of the factors that led to
1125-683: A camera tube, using the CRT instead as a flying-spot scanner to scan slides and film. Ardenne achieved his first transmission of television pictures on 24 December 1933, followed by test runs for a public television service in 1934. The world's first electronically scanned television service then started in Berlin in 1935, the Fernsehsender Paul Nipkow , culminating in the live broadcast of the 1936 Summer Olympic Games from Berlin to public places all over Germany. Philo Farnsworth gave
1250-609: A color television combining a traditional black-and-white display with a rotating colored disk. This device was very "deep" but was later improved with a mirror folding the light path into an entirely practical device resembling a large conventional console. However, Baird was unhappy with the design, and, as early as 1944, had commented to a British government committee that a fully electronic device would be better. In 1939, Hungarian engineer Peter Carl Goldmark introduced an electro-mechanical system while at CBS , which contained an Iconoscope sensor. The CBS field-sequential color system
1375-409: A communal viewing experience to a solitary viewing experience. By 1960, Sony had sold over 4 million portable television sets worldwide. The basic idea of using three monochrome images to produce a color image had been experimented with almost as soon as black-and-white televisions had first been built. Although he gave no practical details, among the earliest published proposals for television
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#17327651949271500-647: A controversial documentary on Jayaprakash Narayan , an opposition leader during the Emergency. In 2014, when Doordarshan broadcast a 70-minute Vijayadashami speech by the Rashtriya Swayamsevak Sangh (RSS) leader Mohan Bhagwat , the Narendra Modi administration and the BJP were criticised for "misusing" the public broadcaster. According to DD director-general Archana Datta, the "speech
1625-819: A fellow of the Royal Society (UK), published a letter in the scientific journal Nature in which he described how "distant electric vision" could be achieved by using a cathode-ray tube, or Braun tube, as both a transmitting and receiving device, he expanded on his vision in a speech given in London in 1911 and reported in The Times and the Journal of the Röntgen Society. In a letter to Nature published in October 1926, Campbell-Swinton also announced
1750-405: A kho to a teammate, or reached the appropriate free zone. The chasing team scores points each time a defender is ruled "out" (dismissed), which happens either when a chaser tags a defender without breaking any rules, when a defender steps out of the court (with no part of the body remaining grounded within), or when a defender is late to enter the court as part of a new batch after the dismissal of
1875-423: A lensed disk scanner with a 48-line resolution. He was granted U.S. Patent No. 1,544,156 (Transmitting Pictures over Wireless) on 30 June 1925 (filed 13 March 1922). Herbert E. Ives and Frank Gray of Bell Telephone Laboratories gave a dramatic demonstration of mechanical television on 7 April 1927. Their reflected-light television system included both small and large viewing screens. The small receiver had
2000-690: A line of the image. Although he never built a working model of the system, variations of Nipkow's spinning-disk " image rasterizer " became exceedingly common. Constantin Perskyi had coined the word television in a paper read to the International Electricity Congress at the International World Fair in Paris on 24 August 1900. Perskyi's paper reviewed the existing electromechanical technologies, mentioning
2125-521: A medium" dates from 1927. The term telly is more common in the UK. The slang term "the tube" or the "boob tube" derives from the bulky cathode-ray tube used on most TVs until the advent of flat-screen TVs . Another slang term for the TV is "idiot box." Facsimile transmission systems for still photographs pioneered methods of mechanical scanning of images in the early 19th century. Alexander Bain introduced
2250-517: A national broadcaster. National telecasts ( DD National ) were introduced in 1982. Colour television began in India with the live telecast of the Independence Day speech by Prime Minister Indira Gandhi on 15 August of that year, followed by the colour telecast of the 1982 Asian Games in Delhi . Two years later, Doordarshan as a TV network finally took shape: the then sole TV channel
2375-442: A phosphor plate. The phosphor was patterned so the electrons from the guns only fell on one side of the patterning or the other. Using cyan and magenta phosphors, a reasonable limited-color image could be obtained. He also demonstrated the same system using monochrome signals to produce a 3D image (called " stereoscopic " at the time). A demonstration on 16 August 1944 was the first example of a practical color television system. Work on
2500-446: A pink-and-purple colour scheme with a new slogan: Desh Ka Apna Channel ("The country's own channel"). Doordarshan transmitted over a network of nearly 1,400 terrestrial transmitters in 2017, with 46 studios producing TV programmes. After the introduction of the private channels, Doordarshan is struggling to keep its position in the television space. Currently Doordarshan is trying to improve its studios and programmes while its primary aim
2625-471: A production model was halted by the SCAP after World War II . Because only a limited number of holes could be made in the disks, and disks beyond a certain diameter became impractical, image resolution on mechanical television broadcasts was relatively low, ranging from about 30 lines up to 120 or so. Nevertheless, the image quality of 30-line transmissions steadily improved with technical advances, and by 1933
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#17327651949272750-506: A projection screen at London's Dominion Theatre . Mechanically scanned color television was also demonstrated by Bell Laboratories in June 1929 using three complete systems of photoelectric cells , amplifiers, glow-tubes, and color filters, with a series of mirrors to superimpose the red, green, and blue images into one full-color image. The first practical hybrid system was again pioneered by John Logie Baird. In 1940 he publicly demonstrated
2875-591: A radio link from Whippany, New Jersey . Comparing the two transmission methods, viewers noted no difference in quality. Subjects of the telecast included Secretary of Commerce Herbert Hoover . A flying-spot scanner beam illuminated these subjects. The scanner that produced the beam had a 50-aperture disk. The disc revolved at a rate of 18 frames per second, capturing one frame about every 56 milliseconds . (Today's systems typically transmit 30 or 60 frames per second, or one frame every 33.3 or 16.7 milliseconds, respectively.) Television historian Albert Abramson underscored
3000-616: A resolution that was not surpassed until May 1932 by RCA, with 120 lines. On 25 December 1926, Kenjiro Takayanagi demonstrated a television system with a 40-line resolution that employed a Nipkow disk scanner and CRT display at Hamamatsu Industrial High School in Japan. This prototype is still on display at the Takayanagi Memorial Museum in Shizuoka University , Hamamatsu Campus. His research in creating
3125-453: A separation of 2.55 metres (8 ft 4 in) between each pole and its adjacent cross lane. Each pole is 120 to 125 centimetres (47 to 49 in) high and 9 to 10 centimetres (3.5 to 3.9 in) in diameter. The poles are smooth and round, with no sharp edges. There are 1.5 m (4 ft 11 in)-long extensions of the court behind each of the poles known as "free zones", in which there are no restrictions on chasers' movements. At
3250-641: A signal reportedly to the 60th power or better and showed great promise in all fields of electronics. Unfortunately, an issue with the multipactor was that it wore out at an unsatisfactory rate. At the Berlin Radio Show in August 1931 in Berlin , Manfred von Ardenne gave a public demonstration of a television system using a CRT for both transmission and reception, the first completely electronic television transmission. However, Ardenne had not developed
3375-427: A sitting chaser becomes active, they may only enter the half of the court which they were facing while they were sitting; additionally, once the newly active chaser steps to the left or right of the cross lane they were sitting in (or turns in such a way that their shoulders face towards either pole), they must continue in that direction until they have reached the free zone. Also, once the newly active chaser steps out of
3500-409: A small transmitter and a makeshift studio. Regular daily transmission started in 1965 as part of All India Radio , with a five-minute news bulletin read by Pratima Puri . Salma Sultan joined Doordarshan in 1967, and became a news anchor. Later Gitanjali Aiyar , Neethi Ravindran, and Rini Simon became popular news anchors in the '70s. Krishi Darshan debuted on Doordarshan on 26 January 1967, and
3625-410: A static photocell. The thallium sulfide (Thalofide) cell, developed by Theodore Case in the U.S., detected the light reflected from the subject and converted it into a proportional electrical signal. This was transmitted by AM radio waves to a receiver unit, where the video signal was applied to a neon light behind a second Nipkow disk rotating synchronized with the first. The brightness of the neon lamp
3750-464: A system that used a mechanical mirror-drum scanner to transmit, in Zworykin's words, "very crude images" over wires to the " Braun tube" ( cathode-ray tube or "CRT") in the receiver. Moving images were not possible because, in the scanner: "the sensitivity was not enough and the selenium cell was very laggy". In 1921, Édouard Belin sent the first image via radio waves with his belinograph . By
3875-472: A television in India. A film named after the broadcaster , spiritually motivated by the 2003 German film Good Bye, Lenin! , was released in February 2020. More than 400,000 television service subscribers. Television Television ( TV ) is a telecommunication medium for transmitting moving images and sound. Additionally, the term can refer to a physical television set rather than
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4000-521: A television set. The replacement of earlier cathode-ray tube (CRT) screen displays with compact, energy-efficient, flat-panel alternative technologies such as LCDs (both fluorescent-backlit and LED ), OLED displays, and plasma displays was a hardware revolution that began with computer monitors in the late 1990s. Most television sets sold in the 2000s they were still CRT , it was only in early 2010s that flat screen TVs have started to overtake CRT TVs once and for all. Major manufacturers announced
4125-484: A television system using fully electronic scanning and display elements and employing the principle of "charge storage" within the scanning (or "camera") tube. The problem of low sensitivity to light resulting in low electrical output from transmitting or "camera" tubes would be solved with the introduction of charge-storage technology by Kálmán Tihanyi beginning in 1924. His solution was a camera tube that accumulated and stored electrical charges ("photoelectrons") within
4250-468: A time-sharing basis for terrestrial broadcasting only. DD News was launched on 3 November 2003 by replacing DD Metro (formerly known as the DD-2 entertainment channel), which provides 24-hour news. These channels are relayed by all terrestrial transmitters in India. The regional-language satellite channels have two components: a regional service for a particular state (relayed by all terrestrial transmitters in
4375-639: Is planning to host the inaugural 2025 Kho Kho World Cup in collaboration with the Kho Kho Federation of India . The IKKF distinguishes between two main formats of kho kho: the standard "test format" and a seven-a-side " fast format ", with the latter being used for the World Cup. Other international kho kho competitions, such as the Asian Kho Kho Championship , have been held with the collaboration of organisations such as
4500-401: Is played on a rectangular court with a central lane connecting two poles which are at either end of the court. During the game, nine players from the chasing team (attacking team) are on the field, with eight of them sitting (crouched) in the central lane, while three runners from the defending team run around the court and try to avoid being touched. Each sitting player on the chasing team faces
4625-571: Is the Indian television's longest-running programme. Television service was extended to Bombay (now Mumbai) and Amritsar in 1972. Until 1975, only seven Indian cities had television service, and Doordarshan was the country's sole television provider. Television service was separated from radio on 1 April 1976. The All India Radio and Doordarshan were placed under the management of separate directors-general in New Delhi. In 1982, Doordarshan became
4750-457: Is to serve the country. Doordarshan operates 46 studios and 33 television channels, including the two pan-India channels ( DD National and DD News ), 17 regional satellite channels, 11 state networks, an international channel ( DD India ), a sports channel ( DD Sports ), DD Bharati , DD Urdu as the cultural and informative channels and an agricultural channel, DD Kisan . On DD National (formerly DD-1), regional and local programs are carried on
4875-520: The 1939 New York World's Fair . On the other hand, in 1934, Zworykin shared some patent rights with the German licensee company Telefunken. The "image iconoscope" ("Superikonoskop" in Germany) was produced as a result of the collaboration. This tube is essentially identical to the super-Emitron. The production and commercialization of the super-Emitron and image iconoscope in Europe were not affected by
5000-786: The 2016 edition . The sport has also been spread overseas to the United Kingdom and South Africa by the South Asian diaspora . Within South Asia, it has been accepted into major sports events such as Khelo India and the National Games of India , with its growth supported by its simplicity and affordability. In the future, Indian officials have targeted adding kho kho to the Asian Games and 2036 Olympics . Kho kho's rules and appearance have changed over time; it
5125-748: The EMI engineering team led by Isaac Shoenberg applied in 1932 for a patent for a new device they called "the Emitron", which formed the heart of the cameras they designed for the BBC. On 2 November 1936, a 405-line broadcasting service employing the Emitron began at studios in Alexandra Palace and transmitted from a specially built mast atop one of the Victorian building's towers. It alternated briefly with Baird's mechanical system in adjoining studios but
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5250-569: The Government of India through the Information and Broadcasting Ministry . Doordarshan has been used, especially during the Emergency , to disseminate government propaganda. During Operation Blue Star in 1984, only government sources were used to report the story. Doordarshan was complicit in the production of a video claiming acts of violence which, when investigated by independent journalists, were found to be false. In 2004, it censored
5375-479: The patent war between Zworykin and Farnsworth because Dieckmann and Hell had priority in Germany for the invention of the image dissector, having submitted a patent application for their Lichtelektrische Bildzerlegerröhre für Fernseher ( Photoelectric Image Dissector Tube for Television ) in Germany in 1925, two years before Farnsworth did the same in the United States. The image iconoscope (Superikonoskop) became
5500-404: The "Iconoscope" by Zworykin, the new tube had a light sensitivity of about 75,000 lux , and thus was claimed to be much more sensitive than Farnsworth's image dissector. However, Farnsworth had overcome his power issues with his Image Dissector through the invention of a completely unique " Multipactor " device that he began work on in 1930, and demonstrated in 1931. This small tube could amplify
5625-661: The 1920s, when amplification made television practical, Scottish inventor John Logie Baird employed the Nipkow disk in his prototype video systems. On 25 March 1925, Baird gave the first public demonstration of televised silhouette images in motion at Selfridges 's department store in London . Since human faces had inadequate contrast to show up on his primitive system, he televised a ventriloquist's dummy named "Stooky Bill," whose painted face had higher contrast, talking and moving. By 26 January 1926, he had demonstrated before members of
5750-421: The 1960s, and broadcasts did not start until 1967. By this point, many of the technical issues in the early sets had been worked out, and the spread of color sets in Europe was fairly rapid. By the mid-1970s, the only stations broadcasting in black-and-white were a few high-numbered UHF stations in small markets and a handful of low-power repeater stations in even smaller markets such as vacation spots. By 1979, even
5875-679: The Dutch company Philips produced and commercialized the image iconoscope and multicon from 1952 to 1958. U.S. television broadcasting, at the time, consisted of a variety of markets in a wide range of sizes, each competing for programming and dominance with separate technology until deals were made and standards agreed upon in 1941. RCA, for example, used only Iconoscopes in the New York area, but Farnsworth Image Dissectors in Philadelphia and San Francisco. In September 1939, RCA agreed to pay
6000-653: The Farnsworth Television and Radio Corporation royalties over the next ten years for access to Farnsworth's patents. With this historic agreement in place, RCA integrated much of what was best about the Farnsworth Technology into their systems. In 1941, the United States implemented 525-line television. Electrical engineer Benjamin Adler played a prominent role in the development of television. The world's first 625-line television standard
6125-555: The Kho Kho Federation of India and the Kho Kho Federation of England . In one variation of kho kho, a team is no longer allowed to chase once it has tagged all the players on the other team. The team that tags all of its opponents in the shortest amount of time wins. UKK uses a modified set of rules referred to by the International Kho Kho Federation as the "fast format", as opposed to
6250-470: The Royal Institution the transmission of an image of a face in motion by radio. This is widely regarded as the world's first true public television demonstration, exhibiting light, shade, and detail. Baird's system used the Nipkow disk for both scanning the image and displaying it. A brightly illuminated subject was placed in front of a spinning Nipkow disk set with lenses that swept images across
6375-560: The Science Museum, South Kensington. In 1928, Baird's company (Baird Television Development Company/Cinema Television) broadcast the first transatlantic television signal between London and New York and the first shore-to-ship transmission. In 1929, he became involved in the first experimental mechanical television service in Germany. In November of the same year, Baird and Bernard Natan of Pathé established France's first television company, Télévision- Baird -Natan. In 1931, he made
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#17327651949276500-465: The Telechrome continued, and plans were made to introduce a three-gun version for full color. However, Baird's untimely death in 1946 ended the development of the Telechrome system. Similar concepts were common through the 1940s and 1950s, differing primarily in the way they re-combined the colors generated by the three guns. The Geer tube was similar to Baird's concept but used small pyramids with
6625-569: The UK broadcasts using the Baird system were remarkably clear. A few systems ranging into the 200-line region also went on the air. Two of these were the 180-line system that Compagnie des Compteurs (CDC) installed in Paris in 1935 and the 180-line system that Peck Television Corp. started in 1935 at station VE9AK in Montreal . The advancement of all-electronic television (including image dissectors and other camera tubes and cathode-ray tubes for
6750-697: The United Kingdom and the United States, and television sets became commonplace in homes, businesses, and institutions. During the 1950s, television was the primary medium for influencing public opinion . In the mid-1960s, color broadcasting was introduced in the U.S. and most other developed countries. The availability of various types of archival storage media such as Betamax and VHS tapes, LaserDiscs , high-capacity hard disk drives , CDs , DVDs , flash drives , high-definition HD DVDs and Blu-ray Discs , and cloud digital video recorders has enabled viewers to watch pre-recorded material—such as movies—at home on their own time schedule. For many reasons, especially
6875-585: The United Kingdom, it was available through the Eurobird satellite on the Sky system's channel 833; its logo was Rayat TV. Transmission via Sky Digital ended in June 2008, and via DirecTV in the United States the following month. Ramayan on DD National created a world record by becoming the highest-viewed entertainment programme globally. The 9 pm show on 16 April 2020 was watched by 77 million viewers. The show managed to reach more than 285 million viewers through
7000-402: The active chaser "giving a kho" to the sitting teammate. One kho must be given by the active chaser upon the dismissal of a batch before the chasing team can tag any players in the next batch. For the kho to be valid, it must be given before the active chaser has gone past the cross lane that the teammate is sitting within, with the sitting teammate not moving/rising before receiving the kho. Once
7125-461: The analog and channel-separated signals used by analog television . Due to data compression , digital television can support more than one program in the same channel bandwidth. It is an innovative service that represents the most significant evolution in television broadcast technology since color television emerged in the 1950s. Digital television's roots have been tied very closely to the availability of inexpensive, high performance computers . It
7250-407: The central lane, they cannot step back into the central lane while tagging a defender. Violating any of these rules results in a "foul", in which case the chasing team can no longer attempt to tag any defenders. In order to clear the foul, the active chaser must move in the opposite direction of the one they were running in (i.e. away from the defenders they were chasing) until they have either given
7375-462: The convenience of remote retrieval, the storage of television and video programming now also occurs on the cloud (such as the video-on-demand service by Netflix ). At the beginning of the 2010s, digital television transmissions greatly increased in popularity. Another development was the move from standard-definition television (SDTV) ( 576i , with 576 interlaced lines of resolution and 480i ) to high-definition television (HDTV), which provides
7500-498: The design of RCA 's " iconoscope " in 1931, the U.S. patent for Tihanyi's transmitting tube would not be granted until May 1939. The patent for his receiving tube had been granted the previous October. Both patents had been purchased by RCA prior to their approval. Charge storage remains a basic principle in the design of imaging devices for television to the present day. On 25 December 1926, at Hamamatsu Industrial High School in Japan, Japanese inventor Kenjiro Takayanagi demonstrated
7625-525: The development of HDTV technology, the MUSE analog format proposed by NHK , a Japanese company, was seen as a pacesetter that threatened to eclipse U.S. electronics companies' technologies. Until June 1990, the Japanese MUSE standard, based on an analog system, was the front-runner among the more than 23 other technical concepts under consideration. Then, a U.S. company, General Instrument, demonstrated
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#17327651949277750-535: The discontinuation of CRT, Digital Light Processing (DLP), plasma, and even fluorescent-backlit LCDs by the mid-2010s. LEDs are being gradually replaced by OLEDs. Also, major manufacturers have started increasingly producing smart TVs in the mid-2010s. Smart TVs with integrated Internet and Web 2.0 functions became the dominant form of television by the late 2010s. Television signals were initially distributed only as terrestrial television using high-powered radio-frequency television transmitters to broadcast
7875-421: The extra information in the signal and produce a limited-resolution color display. The higher-resolution black-and-white and lower-resolution color images combine in the brain to produce a seemingly high-resolution color image. The NTSC standard represented a significant technical achievement. The first color broadcast (the first episode of the live program The Marriage ) occurred on 8 July 1954. However, during
8000-472: The facsimile machine between 1843 and 1846. Frederick Bakewell demonstrated a working laboratory version in 1851. Willoughby Smith discovered the photoconductivity of the element selenium in 1873. As a 23-year-old German university student, Paul Julius Gottlieb Nipkow proposed and patented the Nipkow disk in 1884 in Berlin . This was a spinning disk with a spiral pattern of holes, so each hole scanned
8125-513: The field, and cannot change direction once they start running toward either pole. The chasing team can get around these restrictions if the active chaser either switches roles with a sitting teammate (by touching them on the back while saying "Kho") who is facing the other half of the court and therefore has access to it, or runs to the area behind either pole and then switches direction/half. Each team has two turns to score and two turns to defend, with each turn lasting nine minutes. The team that scores
8250-440: The first outdoor remote broadcast of The Derby . In 1932, he demonstrated ultra-short wave television. Baird's mechanical system reached a peak of 240 lines of resolution on BBC telecasts in 1936, though the mechanical system did not scan the televised scene directly. Instead, a 17.5 mm film was shot, rapidly developed, and then scanned while the film was still wet. A U.S. inventor, Charles Francis Jenkins , also pioneered
8375-431: The following ten years, most network broadcasts and nearly all local programming continued to be black-and-white. It was not until the mid-1960s that color sets started selling in large numbers, due in part to the color transition of 1965, in which it was announced that over half of all network prime-time programming would be broadcast in color that fall. The first all-color prime-time season came just one year later. In 1972,
8500-417: The iconoscope (or Emitron) produced an electronic signal and concluded that its real efficiency was only about 5% of the theoretical maximum. They solved this problem by developing and patenting in 1934 two new camera tubes dubbed super-Emitron and CPS Emitron . The super-Emitron was between ten and fifteen times more sensitive than the original Emitron and iconoscope tubes, and, in some cases, this ratio
8625-693: The industrial standard for public broadcasting in Europe from 1936 until 1960, when it was replaced by the vidicon and plumbicon tubes. Indeed, it represented the European tradition in electronic tubes competing against the American tradition represented by the image orthicon. The German company Heimann produced the Superikonoskop for the 1936 Berlin Olympic Games, later Heimann also produced and commercialized it from 1940 to 1955; finally
8750-402: The inner circle; when a chaser is given a kho, they can only run in the inside or outside of the inner circle depending on which way they were facing while inactive. This variant is played on a circular field, with an inner circle and outer boundary being demarcated. At the start of the game, two of the players become a cat and mouse respectively, with all other players becoming pitchers. All of
8875-437: The invention of the first working transistor at Bell Labs , Sony founder Masaru Ibuka predicted in 1952 that the transition to electronic circuits made of transistors would lead to smaller and more portable television sets. The first fully transistorized, portable solid-state television set was the 8-inch Sony TV8-301 , developed in 1959 and released in 1960. This began the transformation of television viewership from
9000-401: The last holdout among daytime network programs converted to color, resulting in the first completely all-color network season. Early color sets were either floor-standing console models or tabletop versions nearly as bulky and heavy, so in practice they remained firmly anchored in one place. GE 's relatively compact and lightweight Porta-Color set was introduced in the spring of 1966. It used
9125-464: The last of these had converted to color. By the early 1980s, B&W sets had been pushed into niche markets, notably low-power uses, small portable sets, or for use as video monitor screens in lower-cost consumer equipment. By the late 1980s, even these last holdout niche B&W environments had inevitably shifted to color sets. Digital television (DTV) is the transmission of audio and video by digitally processed and multiplexed signals, in contrast to
9250-407: The length of the broadcast. As a broadcasting response to the nationwide lockdown, apart from Ramayan, many other nostalgia shows were broadcast on DD network. These included Mahabharat , Chanakya , Shri Krishna , Malgudi Days , Byomkesh Bakshi and Shaktimaan . In light of increasing public demand for such content, Prasar Bharati launched ‘DD Retro’ as a full-time channel dedicated to
9375-497: The medium of transmission . Television is a mass medium for advertising, entertainment, news, and sports. The medium is capable of more than " radio broadcasting ," which refers to an audio signal sent to radio receivers . Television became available in crude experimental forms in the 1920s, but only after several years of further development was the new technology marketed to consumers. After World War II , an improved form of black-and-white television broadcasting became popular in
9500-472: The men's and women's National titles. The field is 27 by 16 metres (89 by 52 ft), with a distance of 24 metres (79 ft) between the two poles, and the central lane having a width of 30 centimetres (12 in). Each of the cross lanes (which pass through the sitting areas that the chasers sit in, and go from one side of the court to the other) has a width of 35 centimetres (14 in), with adjacent cross lanes 2.3 metres (7 ft 7 in) apart, and
9625-452: The most points by the end of the game wins. The sport is widely played across South Asia , and also has a presence in other regions with a significant South Asian diaspora , such as South Africa and England . It is played most often by school children, and is also a competitive sport. The first franchise league for the sport, Ultimate Kho Kho , was unveiled in India in August 2022. The name comes from Marathi : खोखो ( khō-khō ),
9750-405: The opposite half of the field that their adjacent teammates are facing. At any time, one player from the chasing team (the 'active chaser'/'attacker') may run around the court to attempt to tag (touch) members of the defending team, with one point scored per tag, and each tagged defender required to leave the field; however, the active chaser cannot cross the central lane to access the other half of
9875-466: The original Campbell-Swinton's selenium-coated plate. Although others had experimented with using a cathode-ray tube as a receiver, the concept of using one as a transmitter was novel. The first cathode-ray tube to use a hot cathode was developed by John B. Johnson (who gave his name to the term Johnson noise ) and Harry Weiner Weinhart of Western Electric , and became a commercial product in 1922. In 1926, Hungarian engineer Kálmán Tihanyi designed
10000-456: The phosphors deposited on their outside faces instead of Baird's 3D patterning on a flat surface. The Penetron used three layers of phosphor on top of each other and increased the power of the beam to reach the upper layers when drawing those colors. The Chromatron used a set of focusing wires to select the colored phosphors arranged in vertical stripes on the tube. One of the great technical challenges of introducing color broadcast television
10125-418: The pitchers pair off and stand around the perimeter of the inner circle, with each pair holding each other by the elbow. The cat's goal is to tag the mouse; if the mouse links their elbow with one of the pitchers, then the pitcher who is not connected to the mouse disconnects from the pairing and swaps roles with the mouse. If the cat catches the mouse, then they swap roles. In one variation of elbow tag, when
10250-550: The player draft for Ultimate Kho Kho was completed, which is a six-team franchise-based Indian Kho Kho tournament. Its inaugural season ran from August 14 to September 4, 2022. The Kho Kho Federation of India conducts the National Championships for men, women and juniors every year. The latest (56th) edition, the 2024 National kho kho championship , concluded in Delhi on 1 April 2024 with Maharashtra winning both
10375-520: The possibility of a digital television signal. This breakthrough was of such significance that the FCC was persuaded to delay its decision on an ATV standard until a digitally-based standard could be developed. Kho-kho Kho kho is a traditional South Asian sport that dates to ancient India . It is the second-most popular traditional tag game in the Indian subcontinent after kabaddi . Kho kho
10500-413: The previous batch. In the case of a tie, some matches have a tiebreaker known as a "minimum chase", in which each team is allotted an additional turn to score. Each team's turn ends once they have scored one point, with the team that is faster at scoring a point during their minimum chase turn winning the match. The International Kho Kho Federation (IKKF) administers kho kho at the global level, and
10625-507: The public at this time, viewing of the color field tests was restricted to RCA and CBS engineers and the invited press. The War Production Board halted the manufacture of television and radio equipment for civilian use from 22 April 1942 to 20 August 1945, limiting any opportunity to introduce color television to the general public. As early as 1940, Baird had started work on a fully electronic system he called Telechrome . Early Telechrome devices used two electron guns aimed at either side of
10750-512: The receiver, a type of Kerr cell modulated the light, and a series of differently angled mirrors attached to the edge of a rotating disc scanned the modulated beam onto the display screen. A separate circuit regulated synchronization. The 8x8 pixel resolution in this proof-of-concept demonstration was just sufficient to clearly transmit individual letters of the alphabet. An updated image was transmitted "several times" each second. In 1911, Boris Rosing and his student Vladimir Zworykin created
10875-415: The reproducer) marked the start of the end for mechanical systems as the dominant form of television. Mechanical television, despite its inferior image quality and generally smaller picture, would remain the primary television technology until the 1930s. The last mechanical telecasts ended in 1939 at stations run by a lot of public universities in the United States. In 1897, English physicist J. J. Thomson
11000-564: The resolution of the color information to conserve bandwidth. As black-and-white televisions could receive the same transmission and display it in black-and-white, the color system adopted is [backwards] "compatible." ("Compatible Color," featured in RCA advertisements of the period, is mentioned in the song " America ," of West Side Story , 1957.) The brightness image remained compatible with existing black-and-white television sets at slightly reduced resolution. In contrast, color televisions could decode
11125-558: The results of some "not very successful experiments" he had conducted with G. M. Minchin and J. C. M. Stanton. They had attempted to generate an electrical signal by projecting an image onto a selenium-coated metal plate that was simultaneously scanned by a cathode ray beam. These experiments were conducted before March 1914, when Minchin died, but they were later repeated by two different teams in 1937, by H. Miller and J. W. Strange from EMI , and by H. Iams and A. Rose from RCA . Both teams successfully transmitted "very faint" images with
11250-450: The same. The channel started garnering viewership of almost 5 crore (50 million) within five weeks of its launch. Delivering on its mandate of public messaging, the DD network, through COVID-focused awareness messages and shows, reached more than 400 million viewers during the first wave of the pandemic in 2020. Prasar Bharati is Doordarshan's parent body, and its board members are appointed by
11375-449: The signal to individual television receivers. Alternatively, television signals are distributed by coaxial cable or optical fiber , satellite systems, and, since the 2000s, via the Internet. Until the early 2000s, these were transmitted as analog signals, but a transition to digital television was expected to be completed worldwide by the late 2010s. A standard television set consists of multiple internal electronic circuits , including
11500-595: The significance of the Bell Labs demonstration: "It was, in fact, the best demonstration of a mechanical television system ever made to this time. It would be several years before any other system could even begin to compare with it in picture quality." In 1928, WRGB , then W2XB, was started as the world's first television station. It broadcast from the General Electric facility in Schenectady, NY . It
11625-543: The sound 'kho' is made". The modern form of the game was standardised in 1914, with its rules and formalised structure being given by Pune's Deccan Gymkhana club . The first rule book of Kho-kho was written by Bal Gangadhar Tilak . Kho-kho was demonstrated at the 1936 Berlin Olympics alongside other traditional Indian games. It is now a medal sport in the South Asian Games , having first been played in
11750-647: The spectrum of colors at the transmitting end and could not have worked as he described it. Another inventor, Hovannes Adamian , also experimented with color television as early as 1907. The first color television project is claimed by him, and was patented in Germany on 31 March 1908, patent No. 197183, then in Britain, on 1 April 1908, patent No. 7219, in France (patent No. 390326) and in Russia in 1910 (patent No. 17912). Scottish inventor John Logie Baird demonstrated
11875-439: The standard "test format". The following modifications apply: In this variant, the field is modified so that it is simply a 5 m (16 ft) inner circle and a 7 m (23 ft) outer circle, with the outer circle acting as the boundary of the field. Instead of sitting, eight of the nine chasers stand in positions evenly spaced around the perimeter of the inner circle, with each alternate chaser facing into or away from
12000-401: The start of play, the active chaser starts off in one of the free zones, and can run into either half of the court to tag the three defenders. Once all three defenders have been tagged out or otherwise "dismissed", the next "batch" of three defenders comes onto the court. The active chaser can switch roles with a sitting teammate by touching them on the back and shouting "kho"; this is known as
12125-465: The state), and additional programs in the regional language available through cable operators and DTH operators. DD Sports broadcasts sporting events of national and international importance. It is the only sports channel which telecasts rural sports such as kho-kho and kabbadi . A new regional channel, DD Arunprabha (a 24/7 satellite television channel focusing on the North Eastern region )
12250-546: The system was improved further by eliminating a motor generator so that his television system had no mechanical parts. That year, Farnsworth transmitted the first live human images with his system, including a three and a half-inch image of his wife Elma ("Pem") with her eyes closed (possibly due to the bright lighting required). Meanwhile, Vladimir Zworykin also experimented with the cathode-ray tube to create and show images. While working for Westinghouse Electric in 1923, he began to develop an electronic camera tube. However, in
12375-641: The television. He published an article on "Motion Pictures by Wireless" in 1913, transmitted moving silhouette images for witnesses in December 1923, and on 13 June 1925, publicly demonstrated synchronized transmission of silhouette pictures. In 1925, Jenkins used the Nipkow disk and transmitted the silhouette image of a toy windmill in motion over a distance of 5 miles (8 km), from a naval radio station in Maryland to his laboratory in Washington, D.C., using
12500-546: The term dates back to 1900, when the Russian scientist Constantin Perskyi used it in a paper that he presented in French at the first International Congress of Electricity, which ran from 18 to 25 August 1900 during the International World Fair in Paris. The anglicized version of the term is first attested in 1907, when it was still "...a theoretical system to transmit moving images over telegraph or telephone wires ". It
12625-577: The tube throughout each scanning cycle. The device was first described in a patent application he filed in Hungary in March 1926 for a television system he called "Radioskop". After further refinements included in a 1928 patent application, Tihanyi's patent was declared void in Great Britain in 1930, so he applied for patents in the United States. Although his breakthrough would be incorporated into
12750-522: The use of a CRT as a display device. The Braun tube became the foundation of 20th century television. In 1906 the Germans Max Dieckmann and Gustav Glage produced raster images for the first time in a CRT. In 1907, Russian scientist Boris Rosing used a CRT in the receiving end of an experimental video signal to form a picture. He managed to display simple geometric shapes onto the screen. In 1908, Alan Archibald Campbell-Swinton ,
12875-494: The widespread adoption of television. On 7 September 1927, U.S. inventor Philo Farnsworth 's image dissector camera tube transmitted its first image, a simple straight line, at his laboratory at 202 Green Street in San Francisco. By 3 September 1928, Farnsworth had developed the system sufficiently to hold a demonstration for the press. This is widely regarded as the first electronic television demonstration. In 1929,
13000-584: The word kho is an onomatopoeia of the sound invoked while playing the game. Kho kho has been played since at least the fourth century BC. Certain aspects of kho kho's gameplay may have been mentioned in the Mahabharata . In pre-modern times, it is believed that a version of kho kho known as Rathera was played on chariots ( ratha meaning "chariot" in Sanskrit ). The game was also known in ancient times as "Kho Dhwani Krida", translating as "a game where
13125-430: The work of Nipkow and others. However, it was not until 1907 that developments in amplification tube technology by Lee de Forest and Arthur Korn , among others, made the design practical. The first demonstration of the live transmission of images was by Georges Rignoux and A. Fournier in Paris in 1909. A matrix of 64 selenium cells, individually wired to a mechanical commutator , served as an electronic retina . In
13250-457: The world's first color transmission on 3 July 1928, using scanning discs at the transmitting and receiving ends with three spirals of apertures, each spiral with filters of a different primary color, and three light sources at the receiving end, with a commutator to alternate their illumination. Baird also made the world's first color broadcast on 4 February 1938, sending a mechanically scanned 120-line image from Baird's Crystal Palace studios to
13375-549: The world's first public demonstration of an all-electronic television system, using a live camera, at the Franklin Institute of Philadelphia on 25 August 1934 and for ten days afterward. Mexican inventor Guillermo González Camarena also played an important role in early television. His experiments with television (known as telectroescopía at first) began in 1931 and led to a patent for the "trichromatic field sequential system" color television in 1940. In Britain,
13500-463: Was "...formed in English or borrowed from French télévision ." In the 19th century and early 20th century, other "...proposals for the name of a then-hypothetical technology for sending pictures over distance were telephote (1880) and televista (1904)." The abbreviation TV is from 1948. The use of the term to mean "a television set " dates from 1941. The use of the term to mean "television as
13625-459: Was able, in his three well-known experiments, to deflect cathode rays, a fundamental function of the modern cathode-ray tube (CRT). The earliest version of the CRT was invented by the German physicist Ferdinand Braun in 1897 and is also known as the "Braun" tube. It was a cold-cathode diode , a modification of the Crookes tube , with a phosphor -coated screen. Braun was the first to conceive
13750-518: Was considerably greater. It was used for outside broadcasting by the BBC, for the first time, on Armistice Day 1937, when the general public could watch on a television set as the King laid a wreath at the Cenotaph. This was the first time that anyone had broadcast a live street scene from cameras installed on the roof of neighboring buildings because neither Farnsworth nor RCA would do the same until
13875-654: Was designed in the Soviet Union in 1944 and became a national standard in 1946. The first broadcast in 625-line standard occurred in Moscow in 1948. The concept of 625 lines per frame was subsequently implemented in the European CCIR standard. In 1936, Kálmán Tihanyi described the principle of plasma display , the first flat-panel display system. Early electronic television sets were large and bulky, with analog circuits made of vacuum tubes . Following
14000-458: Was generally played on muddy surfaces in the past, but today is often professionally played on matted surfaces. This transition has altered the game, as more energy is required to run on a matted surface, with injuries also increasing to some extent. Various other aspects of the game, such as the poles and the dimensions of the playing field, were also added over time. Several major kho kho developments have taken place in India . In July 2022,
14125-473: Was launched by Prasar Bharati and showed old classic Hindi serials of Doordarshan. The service, however, shortly ceased its operations on 1 April 2023, due to the low viewership. On the occasion of World Television Day, Prasar Bharati, India’s public broadcaster, has taken a significant leap into the digital streaming landscape with the launch of its own over-the-top (OTT) platform, Waves. The DD India satellite channel has been broadcast in 146 countries. In
14250-399: Was like any other news event; therefore, we covered it." Since private television channels were authorised in 1991, Doordarshan has experienced a steep decline in viewership. Although it earns significant advertising revenue—due to its compulsory feed—from the highest bidder for national events (including cricket matches), there has been a proposal to fund it by imposing a licence fee to own
14375-411: Was more reliable and visibly superior. This was the world's first regular "high-definition" television service. The original U.S. iconoscope was noisy, had a high ratio of interference to signal, and ultimately gave disappointing results, especially compared to the high-definition mechanical scanning systems that became available. The EMI team, under the supervision of Isaac Shoenberg , analyzed how
14500-408: Was not until the 1990s that digital television became possible. Digital television was previously not practically possible due to the impractically high bandwidth requirements of uncompressed digital video , requiring around 200 Mbit/s for a standard-definition television (SDTV) signal, and over 1 Gbit/s for high-definition television (HDTV). A digital television service
14625-410: Was one by Maurice Le Blanc in 1880 for a color system, including the first mentions in television literature of line and frame scanning. Polish inventor Jan Szczepanik patented a color television system in 1897, using a selenium photoelectric cell at the transmitter and an electromagnet controlling an oscillating mirror and a moving prism at the receiver. But his system contained no means of analyzing
14750-855: Was partly mechanical, with a disc made of red, blue, and green filters spinning inside the television camera at 1,200 rpm and a similar disc spinning in synchronization in front of the cathode-ray tube inside the receiver set. The system was first demonstrated to the Federal Communications Commission (FCC) on 29 August 1940 and shown to the press on 4 September. CBS began experimental color field tests using film as early as 28 August 1940 and live cameras by 12 November. NBC (owned by RCA) made its first field test of color television on 20 February 1941. CBS began daily color field tests on 1 June 1941. These color systems were not compatible with existing black-and-white television sets , and, as no color television sets were available to
14875-524: Was popularly known as " WGY Television." Meanwhile, in the Soviet Union , Leon Theremin had been developing a mirror drum-based television, starting with 16 lines resolution in 1925, then 32 lines, and eventually 64 using interlacing in 1926. As part of his thesis, on 7 May 1926, he electrically transmitted and then projected near-simultaneous moving images on a 5-square-foot (0.46 m ) screen. By 1927 Theremin had achieved an image of 100 lines,
15000-462: Was proposed in 1986 by Nippon Telegraph and Telephone (NTT) and the Ministry of Posts and Telecommunication (MPT) in Japan, where there were plans to develop an "Integrated Network System" service. However, it was not possible to implement such a digital television service practically until the adoption of DCT video compression technology made it possible in the early 1990s. In the mid-1980s, as Japanese consumer electronics firms forged ahead with
15125-833: Was scheduled to begin its broadcasting on 15 February 2018; however, its launch was placed on hold. DD Arunprabha was launched on 9 February 2019. On 9 March 2019, Prasar Bharati brought 11 more state DD channels to the satellite footprint of India through DD Free Dish . This includes five channels for the North-eastern states: DD Bangla , DD Chhattisgarh , DD Goa, DD Haryana , DD Himachal Pradesh , DD Jharkhand , DD Manipur, DD Meghalaya, DD Mizoram , DD Nagaland, DD Tripura and DD Uttarakhand . DD Bangla, launched on 9 August 1975, consisting of soap operas, infotainment series, news and current affairs, social programs and films in Bangla in its programming. On 13 April 2020, DD Retro
15250-434: Was split into the nationally aired DD-1 and city channel DD-2, later rebranded in 1993 as DD National and DD Metro to catch up with the then newly privatised TV industry. Live telecasts of the opening and closing ceremonies of the 2012 Summer Olympics were broadcast on its national channel, and DD Sports provided round-the-clock coverage. On 17 November 2014, Doordarshan director-general Vijayalaxmi Chhabra introduced
15375-515: Was the desire to conserve bandwidth , potentially three times that of the existing black-and-white standards, and not use an excessive amount of radio spectrum . In the United States, after considerable research, the National Television Systems Committee approved an all-electronic system developed by RCA , which encoded the color information separately from the brightness information and significantly reduced
15500-500: Was unable or unwilling to introduce evidence of a working model of his tube that was based on his 1923 patent application. In September 1939, after losing an appeal in the courts and being determined to go forward with the commercial manufacturing of television equipment, RCA agreed to pay Farnsworth US$ 1 million over ten years, in addition to license payments, to use his patents. In 1933, RCA introduced an improved camera tube that relied on Tihanyi's charge storage principle. Called
15625-419: Was varied in proportion to the brightness of each spot on the image. As each hole in the disk passed by, one scan line of the image was reproduced. Baird's disk had 30 holes, producing an image with only 30 scan lines, just enough to recognize a human face. In 1927, Baird transmitted a signal over 438 miles (705 km) of telephone line between London and Glasgow . Baird's original 'televisor' now resides in
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