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147-696: NHK World-Japan (formerly and also known simply as NHK World ) is the international arm of the Japanese public broadcaster NHK . Its services are aimed at the overseas market, similar to those offered by other national public-service broadcasters , such as the British BBC ( BBC World Service , the international feed of the BBC News channel , etc.), France 24 , or the German DW . Contents are broadcast through shortwave radio , satellite , and cable operators throughout

294-465: A "chain". The Radio Corporation of America (RCA), General Electric , and Westinghouse organized a competing network around its own flagship station, RCA's WJZ (now WABC) in New York City, but were hampered by AT&T's refusal to lease connecting lines or allow them to sell airtime. In 1926 AT&T sold its radio operations to RCA, which used them to form the nucleus of the new NBC network. By

441-841: A 10 shilling receiver license fee. Both highbrow and mass-appeal programmes were carried by the National and Regional networks. The period from the early 1920s through the 1940s is often called the "Golden Age of Radio". During this period AM radio was the main source of home entertainment, until it was replaced by television. For the first time entertainment was provided from outside the home, replacing traditional forms of entertainment such as oral storytelling and music from family members. New forms were created, including radio plays , mystery serials, soap operas , quiz shows , variety hours , situation comedies and children's shows . Radio news, including remote reporting, allowed listeners to be vicariously present at notable events. Radio greatly eased

588-859: A PBS member station – through pay television providers in Canada via member stations located near the U.S.–Canada border . These educational public broadcasters include the English-language TVOntario (TVO) and the French-language TFO in Ontario , Télé-Québec in Quebec , and Knowledge Network in British Columbia . TVO and Télé-Québec operate through conventional transmitters and cable, while TFO and Knowledge Network are cable-only channels. Beyond these and other provincial services, Canada does not have

735-470: A cable-only educational and cultural public broadcaster owned by the government of Saskatchewan . SCN was sold to Bluepoint Investment Corporation in 2010, and like CTV Two Alberta did when it became privatized, incorporated a limited schedule of entertainment programming during the late afternoon and nighttime hours, while retaining educational and children's programs during the morning until mid-afternoon to fulfill its licensing conditions; Bluepoint later sold

882-557: A central station to all parts of the United States", he was unable to overcome the inherent distance limitations of this technology. The earliest public radiotelegraph broadcasts were provided as government services, beginning with daily time signals inaugurated on January 1, 1905, by a number of U.S. Navy stations. In Europe, signals transmitted from a station located on the Eiffel Tower were received throughout much of Europe. In both

1029-536: A community-funded radio network. CJRT-FM in Toronto also operated as a public government-owned radio station for many years; while no longer funded by the provincial government, it still solicits most of its budget from listener and corporate donations and is permitted to air only a very small amount of commercial advertising. City Saskatchewan originated as the Saskatchewan Communications Network,

1176-596: A concerted attempt to specify performance of AM receivers through the 1993 AMAX standard, a joint effort of the EIA and the NAB, with FCC backing... The FCC rapidly followed up on this with codification of the CQUAM AM stereo standard, also in 1993. At this point, the stage appeared to be set for rejuvenation of the AM band. Nevertheless, with the legacy of confusion and disappointment in the rollout of

1323-617: A consortium, the British Broadcasting Company (BBC), established on 18 October 1922, which was given a monopoly on broadcasting. This enterprise was supported by a tax on radio sets sales, plus an annual license fee on receivers, collected by the Post Office. Initially the eight stations were allowed regional autonomy. In 1927, the original broadcasting organization was replaced by a government chartered British Broadcasting Corporation . an independent nonprofit supported solely by

1470-552: A continuous-wave (CW) transmitter. Fessenden began his research on audio transmissions while doing developmental work for the United States Weather Service on Cobb Island, Maryland. Because he did not yet have a continuous-wave transmitter, initially he worked with an experimental "high-frequency spark" transmitter, taking advantage of the fact that the higher the spark rate, the closer a spark-gap transmission comes to producing continuous waves. He later reported that, in

1617-460: A domestic SW relay station on 9750 kHz from 8:00 to 16:00 UTC: It also leases some hours by several external relay stations for English service in: NHK World-Japan broadcasts via C-band and Ku-band satellites around the globe. The programs and content are also available online. Only a limited number of programs are available online for free. Public broadcaster Common media include AM , FM , and shortwave radio ; television; and

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1764-568: A few " telephone newspaper " systems, most of which were established in Europe, beginning with the Paris Théâtrophone . With this in mind, most early radiotelephone development envisioned that the device would be more profitably developed as a "wireless telephone" for personal communication, or for providing links where regular telephone lines could not be run, rather than for the uncertain finances of broadcasting. The person generally credited as

1911-463: A few hundred ( Hz ), to increase its rotational speed and so generate currents of tens-of-thousands Hz, thus producing a steady continuous-wave transmission when connected to an aerial. The next step, adopted from standard wire-telephone practice, was to insert a simple carbon microphone into the transmission line, to modulate the carrier wave signal to produce AM audio transmissions. However, it would take many years of expensive development before even

2058-587: A frequency of 96.9 FM MHz founded by the president of that era, Alfonso Quiñónez Molina . On 4 November 1964 the Government of El Salvador founded Televisión Educativa de El Salvador as an educational television with the channels 8 and 10. And since 1989, Channel 10 became the only public television channel in El Salvador. In Mexico, public stations are operated by municipalities, state governments and universities, there are five national public channels. Canal Once

2205-417: A government department under the administrative hierarchy, it enjoys editorial independence . It operates seven radio channels and produces television programmes and broadcast on commercial television channels, as these channels are required by law to provide timeslots for RTHK television programmes. RTHK would be assigned a digital terrestrial television channel during 2013 to 2015. In India, Prasar Bharati

2352-512: A home audio device prior to the introduction of the high-fidelity , long-playing record in the late 1940s. Listening habits changed in the 1960s due to the introduction of the revolutionary transistor radio (Regency TR-1, the first transistor radio released December 1954), which was made possible by the invention of the transistor in 1948. (The transistor was invented at Bell labs and released in June 1948.) Their compact size — small enough to fit in

2499-523: A large amount of households has led the receiving fee to become something of a political issue. NHK runs two national terrestrial TV stations ( NHK General and NHK Educational ) and three satellite only services ( NHK BS , NHK BS Premium4K , and NHK BS8K services). NHK also runs 3 national radio services and a number of international radio and television services, akin to the BBC World Service . NHK has also been an innovator in television, developing

2646-469: A listening site at Plymouth, Massachusetts. An American Telephone Journal account of the December 21 alternator-transmitter demonstration included the statement that "It is admirably adapted to the transmission of news, music, etc. as, owing to the fact that no wires are needed, simultaneous transmission to many subscribers can be effected as easily as to a few", echoing the words of a handout distributed to

2793-479: A majority of early broadcasting stations operated on mediumwave frequencies, whose limited range generally restricted them to local audiences. One method for overcoming this limitation, as well as a method for sharing program costs, was to create radio networks , linking stations together with telephone lines to provide a nationwide audience. In the U.S., the American Telephone and Telegraph Company (AT&T)

2940-575: A mixture of news, sports and entertainment in Japanese language worldwide, via satellite and cable providers, as a subscription service mostly targeted at Japanese expatriates . It is marketed with that very name in several regions of the world, including Asia , Oceania , Latin America and Europe . NHK World Premium's contents in Europe were previously shown on JSTV -branded subscription channels that were ran by NHK Cosmomedia Europe and headquartered in

3087-571: A national educational public television network ( TV Cultura , launched in 1969 in São Paulo , which is available in all Brazilian states through its 135 affiliates), two radio stations ( Rádio Cultura FM and Rádio Cultura Brasil, both broadcasting to Greater São Paulo ), two educational TV channels aimed at distance education (TV Educação and Univesp TV, which is available on free-to-air digital TV in São Paulo and nationally by cable and satellite), and

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3234-410: A national programming network. TVRI operates three national television channels, plus more than 32 regional stations. There are also independent local public broadcasters which founded by local government in several cities or regencies. They are obligated to network with either RRI or TVRI, depending on the medium, though they are not owned and operated by the two. In Japan, the main public broadcaster

3381-504: A national public educational network. Canada is also home to a number of former public broadcasting entities that have gone private. CTV Two Alberta , which is licensed as an educational television station in Alberta, was once owned by the Alberta government as the public broadcaster Access. In 1993, the provincial government agreed to cease to direct funding of Access after the 1994 fiscal year;

3528-503: A national scale. The introduction of nationwide talk shows, most prominently Rush Limbaugh 's beginning in 1988, was sometimes credited with "saving" AM radio. However, these stations tended to attract older listeners who were of lesser interest to advertisers, and AM radio's audience share continued to erode. In 1961, the FCC adopted a single standard for FM stereo transmissions, which was widely credited with enhancing FM's popularity. Developing

3675-399: A policy allowing AM stations to simulcast over FM translator stations. Translators had previously been available only to FM broadcasters, in order to increase coverage in fringe areas. Their assignment for use by AM stations was intended to approximate the station's daytime coverage, which in cases where the stations reduced power at night, often resulted in expanded nighttime coverage. Although

3822-482: A prototype alternator-transmitter would be ready, and a few years beyond that for high-power versions to become available. Fessenden worked with General Electric 's (GE) Ernst F. W. Alexanderson , who in August 1906 delivered an improved model which operated at a transmitting frequency of approximately 50 kHz, although at low power. The alternator-transmitter achieved the goal of transmitting quality audio signals, but

3969-665: A radio network in November 1936. It is the successor to the Canadian Radio Broadcasting Commission (CRBC), which was established by the administration of Prime Minister R.B. Bennett in 1932, modeled on recommendations made in 1929 by the Royal Commission on Radio Broadcasting and stemming from lobbying efforts by the Canadian Radio League . The Canadian Broadcasting Corporation took over operation of

4116-423: A result, AM radio tends to do best in areas where FM frequencies are in short supply, or in thinly populated or mountainous areas where FM coverage is poor. Great care must be taken to avoid mutual interference between stations operating on the same frequency. In general, an AM transmission needs to be about 20 times stronger than an interfering signal to avoid a reduction in quality, in contrast to FM signals, where

4263-493: A secondary affiliate of the English language CBC Television service. CBC operates two national television networks ( CBC Television and Ici Radio-Canada Télé ), four radio networks ( CBC Radio One , CBC Radio 2 , Ici Radio-Canada Première , and Ici Musique ) and several cable television channels including two 24-hour news channels ( CBC News Network and Ici RDI ) in both of Canada's official languages – English and French – and

4410-452: A shirt pocket — and lower power requirements, compared to vacuum tubes, meant that for the first time radio receivers were readily portable. The transistor radio became the most widely used communication device in history, with billions manufactured by the 1970s. Radio became a ubiquitous "companion medium" which people could take with them anywhere they went. The demarcation between what is considered "experimental" and "organized" broadcasting

4557-427: A short-range "wireless telephone" demonstration, that included simultaneously broadcasting speech and music to seven locations throughout Murray, Kentucky. However, this was transmitted using induction rather than radio signals, and although Stubblefield predicted that his system would be perfected so that "it will be possible to communicate with hundreds of homes at the same time", and "a single message can be sent from

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4704-666: A strong history of public broadcasting in South America. Inaugurated in 1963, Televisión Nacional Uruguay (TNU) is now linked to the Ministry of Education and Culture of the country. In addition, the Radiodifusión Nacional de Uruguay is a network of radios with 20 different stations in AM and FM that cover the entire country. Since 1998, the Venezuelan state had only one television channel Venezolana de Televisión , and after 2002

4851-461: A widespread audience — dates back to the founding period of radio development, even though the earliest radio transmissions, originally known as "Hertzian radiation" and "wireless telegraphy", used spark-gap transmitters that could only transmit the dots-and-dashes of Morse code . In October 1898 a London publication, The Electrician , noted that "there are rare cases where, as Dr. [Oliver] Lodge once expressed it, it might be advantageous to 'shout'

4998-405: Is radio broadcasting using amplitude modulation (AM) transmissions. It was the first method developed for making audio radio transmissions, and is still used worldwide, primarily for medium wave (also known as "AM band") transmissions, but also on the longwave and shortwave radio bands. The earliest experimental AM transmissions began in the early 1900s. However, widespread AM broadcasting

5145-675: Is India's public broadcaster. It is an autonomous corporation of the Ministry of Information and Broadcasting (India) , Government of India and comprises the Doordarshan television network ( DD National , DD India , DD News , DD Retro ) and All India Radio . Prasar Bharati was established on 23 November 1997, following a demand that the government owned broadcasters in India should be given autonomy like those in many other countries. The Parliament of India passed an Act to grant this autonomy in 1990, but it

5292-521: Is a current affairs and cultural channel that broadcasts internationally via satellite and cable TV. Programming is produced in English only. It began as a news channel in February 2009. NHK World-Japan's free-to-air broadcasts have been available in HD by satellite since then. NHK World-Japan HD currently broadcasts from Intelsat 19 166°E, 68.5°E, Astra 19.2°E , Hot Bird 13°E, 58°W, to SES-3 103°W. Some of

5439-465: Is argued to exist when the benefits to viewers are relatively high in comparison to the benefits to advertisers from contacting viewers. This frequently is the case in undeveloped countries that normally have low benefits to advertising. An alternative funding model proposed by Michael Slaby is to give every citizen credits they can use to pay qualified media sources for civic information and reporting. Additionally, public broadcasting may facilitate

5586-578: Is becoming increasingly common for them to adopt the format and branding of a local news channel. Canada also has a large number of campus radio and community radio stations. Colombia had between 1955 and 1998 a public television system very similar to that adopted by the NPO in the Netherlands, where private television producers called " programadoras " were given hours on the country's two public television channels ( Cadena Uno and Canal A ). In 1998, when

5733-406: Is comparable to or better in audio quality than a standard analog broadcast". Despite the various actions, AM band audiences continued to contract, and the number of stations began to slowly decline. A 2009 FCC review reported that "The story of AM radio over the last 50 years has been a transition from being the dominant form of audio entertainment for all age groups to being almost non-existent to

5880-497: Is largely arbitrary. Listed below are some of the early AM radio broadcasts, which, due to their irregular schedules and limited purposes, can be classified as "experimental": People who weren't around in the Twenties when radio exploded can't know what it meant, this milestone for mankind. Suddenly, with radio, there was instant human communication. No longer were our homes isolated and lonely and silent. The world came into our homes for

6027-764: Is owned and operated by the National Politechnical Institute . It started transmissions on 2 March 1959 as the first public broadcasting television in Mexico. The government of Mexico implemented Telesecundaria in 1968 to provide secondary education to students in rural areas through broadcast television channels, such as XHGC-TV in Mexico City. With the launching of the Morelos II satellite, Telesecundaria began transmitting on one of its analog channels in 1988; in 1994, it began broadcasting in digital format with

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6174-868: Is part of the university and cultural diffusion. Canal Catorce was founded in 2012 and is operated by the Sistema Público de Radiodifusión del Estado Mexicano (SPR), an agency from the Federal Government. In the United States , public broadcasters may receive some funding from both federal and state sources, but generally most of their financial support comes from underwriting by foundations and businesses (ranging from small shops to corporations), along with audience contributions via pledge drives . The great majority operate as private not-for-profit corporations . Early public stations were operated by state colleges and universities and were often run as part of

6321-606: Is that public broadcasting is incompatible with commercial objectives. The other is that public broadcasting can and should compete in the marketplace with commercial broadcasters. This dichotomy is highlighted by the public service aspects of traditional commercial broadcasters. Public broadcasters in each jurisdiction may or may not be synonymous with government controlled broadcasters. Public broadcasters may receive their funding from an obligatory television licence fee, individual contributions, government funding or commercial sources. Public broadcasters do not rely on advertising to

6468-591: Is the NHK (Japan Broadcasting Corporation). The broadcaster was set up in 1926 and was modelled on the British Broadcasting Company , the precursor to the British Broadcasting Corporation created in 1927. Much like the BBC, NHK is funded by a "receiving fee" from every Japanese household, with no commercial advertising and the maintenance of a position of strict political impartiality. However, rampant non-payment by

6615-574: Is the public service channel of Ecuador, established in October 2007. The channel was established at the same time as the installation of the Ecuadorian Constituent Assembly so that the sessions could be transmitted live to all the country. Salvadoran broadcasting has a public service radio and television channel. On 1 March 1926 began the operation as the first Central American broadcasting network called "Radio Nacional de El Salvador" with

6762-554: The Bolivarian Revolution . The Bengali primary state television broadcaster is Bangladesh Television which also broadcasts worldwide through its satellite based branch, BTV World . There are also terrestrial state run TV channels: Sangsad TV owned and operated by Bengali parliament that covers the proceedings of the Parliament. The Bangladesh Betar (BB) is the country's sole state radio broadcaster. Radio transmission in

6909-556: The Electronic Industries Association (EIA) and the National Association of Broadcasters (NAB) with the intention of helping AM stations, especially ones with musical formats, become more competitive with FM broadcasters by promoting better quality receivers. However, the stereo AM and AMAX initiatives had little impact, and a 2015 review of these events concluded that Initially the consumer manufacturers made

7056-657: The Emergency Alert System (EAS). Some automakers have been eliminating AM radio from their electric vehicles (EVs) due to interference from the electric motors , but the lawmakers argue that this is a safety risk and that car owners should have access to AM radio regardless of the type of vehicle they drive. The proposed legislation would require all new vehicles to include AM radio at no additional charge, and it would also require automakers that have already eliminated AM radio to inform customers of alternatives. A proper solution would be to switch to DRM30 as indicated in

7203-791: The FM band was authorized to begin normal broadcasting. Houston 's KUHT was the nation's first public television station founded by Dr. John W. Meaney, and signed on the air on May 25, 1953, from the campus of the University of Houston . In rural areas, it was not uncommon for colleges to operate commercial stations instead (e.g., the University of Missouri 's KOMU , an NBC -affiliated television station in Columbia ). The FCC had reserved almost 250 broadcast frequencies for use as educational television stations in 1953, though by 1960, only 44 stations allocated for educational use had begun operations. The passage of

7350-479: The Federal Emergency Management Agency (FEMA) expressed concerns that this would reduce the effectiveness of emergency communications. In May 2023, a bipartisan group of lawmakers in the United States introduced legislation making it illegal for automakers to eliminate AM radio from their cars. The lawmakers argue that AM radio is an important tool for public safety due to being a component of

7497-453: The Internet . Public broadcasting may be nationally or locally operated, depending on the country and the station. In some countries a single organization runs public broadcasting. Other countries have multiple public-broadcasting organizations operating regionally or in different languages. Historically, public broadcasting was once the dominant or only form of broadcasting in many countries (with

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7644-612: The Pontifical Catholic University of Valparaíso on channels 8 and 4. Channel 8, in Valparaíso , is the first and oldest station on Chile, transmitting since 5 October 1957. As soon as 1961 universities began transmitting advertisements between their programmes, the first of them being the Channel ;9, showing a Motorola TV set. This kind of disguised advertising took the name of "Payola". This situation, added to

7791-547: The Public Broadcasting Act of 1967 precipitated the development of the current public broadcasting system in the U.S. The legislation established the Corporation for Public Broadcasting (CPB), a private entity that is charged with facilitating programming diversity among public broadcasters, the development and expansion of non-commercial broadcasting, and providing funding to local stations to help them create programs;

7938-431: The electrolytic detector and thermionic diode ( Fleming valve ) were invented by Reginald Fessenden and John Ambrose Fleming , respectively. Most important, in 1904–1906 the crystal detector , the simplest and cheapest AM detector, was developed by G. W. Pickard . Homemade crystal radios spread rapidly during the next 15 years, providing ready audiences for the first radio broadcasts. One limitation of crystals sets

8085-505: The presidential election in 2018 that the public broadcaster is allegedly a "job hanger" (public company existing only for the purpose of securing positions for political allies) and has proposed to privatize or extinguish the public company. On April 9, 2021, the president inserted the public company into the National Privatization Program, with the intention of carrying out studies about the possibility of privatization of

8232-430: The " capture effect " means that the dominant signal needs to only be about twice as strong as the interfering one. To allow room for more stations on the mediumwave broadcast band in the United States, in June 1989 the FCC adopted a National Radio Systems Committee (NRSC) standard that limited maximum transmitted audio bandwidth to 10.2 kHz, limiting occupied bandwidth to 20.4 kHz. The former audio limitation

8379-587: The 1930s, most of the major radio stations in the country were affiliated with networks owned by two companies, NBC and CBS . In 1934, a third national network, the Mutual Radio Network , was formed as a cooperative owned by its stations. A second country which quickly adopted network programming was the United Kingdom, and its national network quickly became a prototype for a state-managed monopoly of broadcasting. A rising interest in radio broadcasting by

8526-660: The 1940s two new broadcast media, FM radio and television , began to provide extensive competition with the established broadcasting services. The AM radio industry suffered a serious loss of audience and advertising revenue, and coped by developing new strategies. Network broadcasting gave way to format broadcasting: instead of broadcasting the same programs all over the country, stations individually adopted specialized formats which appealed to different audiences, such as regional and local news, sports, "talk" programs, and programs targeted at minorities. Instead of live music, most stations began playing less expensive recorded music. In

8673-528: The AM radio industry in the United States developed technology for broadcasting in stereo . Other nations adopted AM stereo, most commonly choosing Motorola's C-QUAM, and in 1993 the United States also made the C-QUAM system its standard, after a period allowing four different standards to compete. The selection of a single standard improved acceptance of AM stereo , however overall there was limited adoption of AM stereo worldwide, and interest declined after 1990. With

8820-555: The Advancement of New Language Applications Ltd.'), a private not-for-profit consortium of educational institutions in the province of Quebec. Some local community stations also operate non-commercially with funding from corporate and individual donors. In addition, cable companies are required to produce a local community channel in each licensed market. Such channels have traditionally aired community talk shows, city council meetings and other locally oriented programming, although it

8967-521: The British public pressured the government to reintroduce the service, following its suspension in 1920. However, the government also wanted to avoid what it termed the "chaotic" U.S. experience of allowing large numbers of stations to operate with few restrictions. There were also concerns about broadcasting becoming dominated by the Marconi company. Arrangements were made for six large radio manufacturers to form

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9114-582: The CPB receives funding earmarked by the federal government as well as through public and private donations. Public television and radio in the U.S. have, from the late 1960s onward, dealt with severe criticism from conservative politicians and think-tanks (such as The Heritage Foundation ), which allege that its programming has a leftist bias and there have been successful attempts to reduce – though not eliminate – funding for public television stations by some state legislatures. The first public radio network in

9261-636: The CRBC's nine radio stations (which were largely concentrated in major cities across Canada, including Toronto , Vancouver , Montreal , and Ottawa ). The CBC eventually expanded to television in September 1952 with the sign-on of CBFT in Montreal; CBFT was the first television station in Canada to initiate full-time broadcasts, which initially served as a primary affiliate of the French language Télévision de Radio-Canada and

9408-465: The Colombian government allowed the opening of television to the private market by granting two broadcast licenses to the programadoras Caracol Televisión and RCN Televisión , these television producers went into crisis, causing many to end their activities or produce content for the private television channels. Currently, Colombia has three public channels (one is operated by a private company formed by

9555-549: The French-language channels Ici Explora and Ici ARTV , dedicated to science and culture respectively. CBC's national television operations and some radio operations are funded partly by advertisements, in addition to the subsidy provided by the federal government. The cable channels are commercial entities owned and operated by the CBC and do not receive any direct public funds, however, they do benefit from synergies with resources from

9702-587: The Public Radio Satellite System. Cultural Native American and Mexican American music and programming are also featured regionally. NPR is colloquially though inaccurately conflated with public radio as a whole, when in fact "public radio" includes many organizations. In the United States, the Public Broadcasting Service (PBS) serves as the nation's main public television provider. When it launched in October 1970, PBS assumed many of

9849-413: The Secretariat of Communication of the state government. Brazil also has many campus radio and community radio stations and several educational local TV channels (many of them belonging to public and private universities). In Canada, the main public broadcaster is the national Canadian Broadcasting Corporation (CBC; French : Société Radio-Canada ), a crown corporation – which originated as

9996-411: The Twenties when radio exploded can't know what it meant, this milestone for mankind. Suddenly, with radio, there was instant human communication. No longer were our homes isolated and lonely and silent. The world came into our homes for the first time. Music came pouring in. Laughter came in. News came in. The world shrank, with radio. The idea of broadcasting — the unrestricted transmission of signals to

10143-503: The UK. The service is known as テレビジャパン ( TV Japan ) in the US, which is run by NHK Cosmomedia America until the closure on March 31, 2024. Contents generally do not carry English subtitles. NHK World Radio Japan ( RJ ) is the international radio arm of NHK. It broadcasts a weekly lineup of news, current affairs, cultural, and educative radio program focusing on Japan and Asia, for a daily total of 65 hours of broadcasts. Radio Japan provides two main feeds: NHK World Radio Japan runs

10290-419: The United States and France this led to a small market of receiver lines geared for jewelers who needed accurate time to set their clocks, including the Ondophone in France, and the De Forest RS-100 Jewelers Time Receiver in the United States The ability to pick up time signal broadcasts, in addition to Morse code weather reports and news summaries, also attracted the interest of amateur radio enthusiasts. It

10437-399: The United States was founded in 1949 in Berkeley, California, as station KPFA , which became and remains the flagship station for a national network called Pacifica Radio . From the beginning, the network has refused corporate funding of any kind, and has relied mainly on listener support. KPFA gave away free FM radios to build a listener base and to encourage listeners to "subscribe" (support

10584-668: The advent of the Solidaridad I satellite, and Edusat was established and began transmitting in Mexico, Central America and certain regions of the United States. In 1982, Canal 22 was founded and began operations eleven years later by the Ministry of Culture as part of the "RED México". In 2005 the National Autonomous University of Mexico (UNAM in Spanish) began transmissions as the sister channel of XEUN-AM and XEUN-FM (both radio stations founded in 1959), TV UNAM which

10731-523: The antenna wire. This meant that the full transmitter power flowed through the microphone, and even using water cooling, the power handling ability of the microphones severely limited the power of the transmissions. Ultimately only a small number of large and powerful Alexanderson alternators would be developed. However, they would be almost exclusively used for long-range radiotelegraph communication, and occasionally for radiotelephone experimentation, but were never used for general broadcasting. Almost all of

10878-474: The audience has continued to decline. In 1987, the elimination of the Fairness Doctrine requirement meant that talk shows, which were commonly carried by AM stations, could adopt a more focused presentation on controversial topics, without the distraction of having to provide airtime for any contrasting opinions. In addition, satellite distribution made it possible for programs to be economically carried on

11025-618: The broadcaster. While many members have significant editorial independence, the Alliance includes organizations that have significant state control, especially with regard to island nations. In Brazil, the two main national public broadcasters are Empresa Brasil de Comunicação (EBC) and the Fundação Padre Anchieta (FPA). EBC was created in 2007 to manage the Brazilian federal government's radio and television stations. EBC owns broadcast

11172-590: The channel to Rogers Media in 2012, expanding a relationship it began with SCN in January of that year, when Rogers began supplying entertainment programming to the channel through an affiliation agreement with its English-language broadcast network, Citytv . One television station, CFTU in Montreal , operates as an educational station owned by CANAL ( French : Corporation pour l'Avancement de Nouvelles Applications des Langages Ltée , lit.   'Corporation for

11319-564: The channel was sold to CHUM Limited in 1995, which initially acquired the channel through a majority-owned subsidiary, Learning and Skills Television of Alberta Limited (LSTA). To fulfill its license conditions as an educational station, it broadcasts educational and children's programming during the daytime hours, while airing entertainment programming favoured by advertisers and viewers in prime time. The service discontinued its broadcast transmitters in Calgary and Edmonton in August 2011, due to

11466-531: The channel, NHK Huayu Shijie (NHK华语视界), which essentially provides news and select programs from NHK World-Japan with Mandarin dubbing and/or subtitles, was launched on January 15, 2019, and is only distributed online. The branch was rebranded from its former name of NHK World in April 2018. NHK World TV started broadcasting services for North America and Europe in 1995. On April 1, 1998, then-called NHK World Television started broadcasting. Today's NHK World-Japan

11613-404: The characteristics of arc-transmitters . Fessenden attempted to sell this form of radiotelephone for point-to-point communication, but was unsuccessful. Fessenden's work with high-frequency spark transmissions was only a temporary measure. His ultimate plan for creating an audio-capable transmitter was to redesign an electrical alternator , which normally produced alternating current of at most

11760-501: The children's TV channel TV Rá-Tim-Bum , available nationally on pay TV. Many Brazilian states also have regional and statewide public radio and television stations. One example is Minas Gerais , which has the EMC ( Empresa Mineira de Comunicação ), a public corporation created in 2016 modelled on EBC, formed by Rede Minas , a statewide television network and the two stations of Rádio Inconfidência , which operates in AM, FM and shortwave ; in

11907-403: The commission estimated that fewer than 250 AM stations were transmitting hybrid mode signals. On October 27, 2020, the FCC voted to allow AM stations to eliminate their analog transmissions and convert to all-digital operation, with the requirement that stations making the change had to continue to make programming available over "at least one free over-the-air digital programming stream that

12054-475: The continued migration of AM stations away from music to news, sports, and talk formats, receiver manufacturers saw little reason to adopt the more expensive stereo tuners, and thus radio stations have little incentive to upgrade to stereo transmission. In countries where the use of directional antennas is common, such as the United States, transmitter sites consisting of multiple towers often occupy large tracts of land that have significantly increased in value over

12201-437: The continuous wave AM transmissions made prior to 1915 were made by versions of the arc converter transmitter, which had been initially developed by Valdemar Poulsen in 1903. Arc transmitters worked by producing a pulsating electrical arc in an enclosed hydrogen atmosphere. They were much more compact than alternator transmitters, and could operate on somewhat higher transmitting frequencies. However, they suffered from some of

12348-557: The corporation decommissioning its network of rebroadcasters following Canada's transition to digital television in August 2011 have significantly reduced the terrestrial coverage of both CBC Television and Ici Radio-Canada Télé; the Canadian Radio-television and Telecommunications Commission (CRTC) does require cable, satellite and IPTV providers to carry CBC and Radio-Canada stations as part of their basic tier, regardless of terrestrial availability in an individual market. Of

12495-434: The decades, to the point that the value of land exceeds that of the station itself. This sometimes results in the sale of the transmitter site, with the station relocating to a more distant shared site using significantly less power, or completely shutting down operations. The ongoing development of alternative transmission systems, including Digital Audio Broadcasting (DAB), satellite radio, and HD (digital) radio, continued

12642-567: The decline of the popularity of the traditional broadcast technologies. These new options, including the introduction of Internet streaming, particularly resulted in the reduction of shortwave transmissions, as international broadcasters found ways to reach their audiences more easily. In 2022 it was reported that AM radio was being removed from a number of electric vehicle (EV) models, including from cars manufactured by Tesla, Audi, Porsche, BMW and Volvo, reportedly due to automakers concerns that an EV's higher electromagnetic interference can disrupt

12789-569: The demonstration witnesses, which stated "[Radio] Telephony is admirably adapted for transmitting news, stock quotations, music, race reports, etc. simultaneously over a city, on account of the fact that no wires are needed and a single apparatus can distribute to ten thousand subscribers as easily as to a few. It is proposed to erect stations for this purpose in the large cities here and abroad." However, other than two holiday transmissions reportedly made shortly after these demonstrations, Fessenden does not appear to have conducted any radio broadcasts for

12936-687: The diagram above. AM radio technology is simpler than later transmission systems. An AM receiver detects amplitude variations in the radio waves at a particular frequency, then amplifies changes in the signal voltage to operate a loudspeaker or earphone . However, the simplicity of AM transmission also makes it vulnerable to "static" ( radio noise , radio frequency interference ) created by both natural atmospheric electrical activity such as lightning, and electrical and electronic equipment, including fluorescent lights, motors and vehicle ignition systems. In large urban centers, AM radio signals can be severely disrupted by metal structures and tall buildings. As

13083-645: The expectation is that listeners will primarily be tuning into the FM signal rather than the nominally "primary" AM station. A 2020 review noted that "for many owners, keeping their AM stations on the air now is pretty much just about retaining their FM translator footprint rather than keeping the AM on the air on its own merits". In 2018 the FCC, led by then-Commission Chairman Ajit Pai , proposed greatly reducing signal protection for 50 kW Class A " clear channel " stations. This would allow co-channel secondary stations to operate with higher powers, especially at night. However,

13230-467: The expense of transitioning the two stations to digital , and the fact that the service had mandatory carriage on television providers serving Alberta regardless of whether it ran over-the-air transmitters. The service has since operated as part of Bell Media 's CTV Two chain of stations. Public radio station CKUA in Alberta was also formerly operated by Access, before being sold to the non-profit CKUA Radio Foundation which continues to operate it as

13377-533: The fact that TV was only reaching Santiago and Valparaíso , led to the creation of a state network that should serve the entire country. This network, created in 1964 and in operation since 24 October 1969, is known as " Televisión Nacional de Chile ". After the military government of Augusto Pinochet , television was mostly deregulated. Thus, two new commercial channels were born: Megavisión (Channel 9, on 23 October 1990) and La Red (Channel 4, on 12 May 1991). The University of Chile's Channel 11 also

13524-445: The fall of 1900, he successfully transmitted speech over a distance of about 1.6 kilometers (one mile), which appears to have been the first successful audio transmission using radio signals. However, at this time the sound was far too distorted to be commercially practical. For a time he continued working with more sophisticated high-frequency spark transmitters, including versions that used compressed air, which began to take on some of

13671-401: The first time. Music came pouring in. Laughter came in. News came in. The world shrank, with radio. Following World War I, the number of stations providing a regular broadcasting service greatly increased, primarily due to advances in vacuum-tube technology. In response to ongoing activities, government regulators eventually codified standards for which stations could make broadcasts intended for

13818-497: The following principles: While the application of certain principles may be straightforward, as in the case of accessibility, some of the principles may be poorly defined or difficult to implement. In the context of a shifting national identity, the role of public broadcasting may be unclear. Likewise, the subjective nature of good programming may raise the question of individual or public taste. Within public broadcasting there are two different views regarding commercial activity. One

13965-583: The functions of its predecessor, National Educational Television (NET). NET was shut down by the Ford Foundation and the Corporation for Public Broadcasting after the network refused to stop airing documentaries on varying social issues that had alienated many of the network's affiliates. PBS would later acquire Educational Television Stations , an organization founded by the National Association of Educational Broadcasters (NAEB), in 1973. Uruguay has

14112-572: The general public, for example, in the United States formal recognition of a "broadcasting service" came with the establishment of regulations effective December 1, 1921, and Canadian authorities created a separate category of "radio-telephone broadcasting stations" in April 1922. However, there were numerous cases of entertainment broadcasts being presented on a regular schedule before their formal recognition by government regulators. Some early examples include: Because most longwave radio frequencies were used for international radiotelegraph communication,

14259-417: The general public, or to have even given additional thought about the potential of a regular broadcast service, and in a 1908 article providing a comprehensive review of the potential uses for his radiotelephone invention, he made no references to broadcasting. Because there was no way to amplify electrical currents at this time, modulation was usually accomplished by a carbon microphone inserted directly in

14406-487: The government decided to launch the channel ViVe (2003), teleSUR (2005), TVES (2007) (a signal that until that year was occupied by RCTV ) and Asamblea Nacional Televisión in addition to supporting and financing a network of community channels as well as Ávila Television belonging to the Metropolitan Mayor's Office of Caracas. United States politicians have commented that TeleSUR is a propaganda tool in favor of

14553-512: The implementation of a cultural policy (an industrial policy and investment policy for culture). Examples include: As an industry organization for public media, the Public Media Alliance supports its members and the industry of public media more broadly. For example, the Alliance advocated against a proposal on the Isle of Man that they felt would jeopardize the editorial independence of

14700-541: The isolation of rural life. Political officials could now speak directly to millions of citizens. One of the first to take advantage of this was American president Franklin Roosevelt , who became famous for his fireside chats during the Great Depression . However, broadcasting also provided the means to use propaganda as a powerful government tool, and contributed to the rise of fascist and communist ideologies. In

14847-411: The lack of any way to amplify the signals meant they were somewhat weak. On December 21, 1906, Fessenden made an extensive demonstration of the new alternator-transmitter at Brant Rock, Massachusetts, showing its utility for point-to-point wireless telephony, including interconnecting his stations to the wire telephone network. As part of the demonstration, speech was transmitted 18 kilometers (11 miles) to

14994-419: The late 1960s and 1970s, top 40 rock and roll stations in the U.S. and Canada such as WABC and CHUM transmitted highly processed and extended audio to 11 kHz, successfully attracting huge audiences. For young people, listening to AM broadcasts and participating in their music surveys and contests was the social media of the time. In the late 1970s, spurred by the exodus of musical programming to FM stations,

15141-399: The marketplace decide" which was best. The lack of a common standard resulted in consumer confusion and increased the complexity and cost of producing AM stereo receivers. In 1993, the FCC again revised its policy, by selecting C-QUAM as the sole AM stereo implementation. In 1993, the FCC also endorsed, although it did not make mandatory, AMAX broadcasting standards that were developed by

15288-432: The message, spreading it broadcast to receivers in all directions". However, it was recognized that this would involve significant financial issues, as that same year The Electrician also commented "did not Prof. Lodge forget that no one wants to pay for shouting to the world on a system by which it would be impossible to prevent non-subscribers from benefiting gratuitously?" On January 1, 1902, Nathan Stubblefield gave

15435-448: The multiple incompatible AM stereo systems, and failure of the manufacturers (including the auto makers) to effectively promote AMAX radios, coupled with the ever-increasing background of noise in the band, the general public soon lost interest and moved on to other media. On June 8, 1988, an International Telecommunication Union (ITU)-sponsored conference held at Rio de Janeiro, Brazil adopted provisions, effective July 1, 1990, to extend

15582-537: The necessity of having to transmit a high power carrier wave to overcome ground losses, and the large antenna radiators required at the low broadcast frequencies, but can be sent over long distances via the ionosphere at night; however, they are much more susceptible to interference, and often have lower audio fidelity. Thus, AM broadcasters tend to specialize in spoken-word formats, such as talk radio , all-news radio and sports radio , with music formats primarily for FM and digital stations. People who weren't around in

15729-723: The network has moved its programming to stations opened by the corporation or has purchased certain affiliates from private broadcasting groups; budgetary issues led the CBC to choose not to launch new rebroadcast transmitters in markets where the network disaffiliated from a private station after 2006; the network dropped its remaining private affiliates in 2016, when CJDC-TV — Dawson Creek and CFTK-TV — Terrace, British Columbia defected from CBC Television that February and Lloydminster -based CKSA-DT disaffiliated in August of that year (to become affiliates of CTV Two and Global , respectively). The CBC's decision to disaffiliate from these and other privately owned stations, as well as

15876-405: The new frequencies. It was now estimated that the expanded band could accommodate around 300 U.S. stations. However, it turned out that the number of possible station reassignments was much lower, with a 2006 accounting reporting that, out of 4,758 licensed U.S. AM stations, only 56 were now operating on the expanded band. Moreover, despite an initial requirement that by the end of five years either

16023-428: The new policy, by 2011 there were approximately 500 in operation, and as of 2020 approximately 2,800 of the 4,570 licensed AM stations were rebroadcasting on one or more FM translators. In 2009 the FCC stated that "We do not intend to allow these cross-service translators to be used as surrogates for FM stations". However, based on station slogans, especially in the case of recently adopted musical formats, in most cases

16170-447: The notable exceptions of the United States, Mexico, and Brazil). Commercial broadcasting now also exists in most of these countries; the number of countries with only public broadcasting declined substantially during the latter part of the 20th century . The primary mission of public broadcasting is that of public service, speaking to and engaging as a citizen. The British model is often referenced in definitions. The model embodies

16317-461: The online radio service CBC Radio 3 , music streaming service CBC Music , and the launch of online news services, such as CBC Hamilton , in some markets which are not directly served by their own CBC television or radio stations. In addition, several provinces operate public broadcasters; these are not CBC subentities, but distinct networks in their own right. Most of the provincial services maintain an educational programming format, differing from

16464-411: The original station or its expanded band counterpart had to cease broadcasting, as of 2015 there were 25 cases where the original standard band station was still on the air, despite also operating as an expanded band station. HD Radio is a digital audio broadcasting method developed by iBiquity . In 2002 its "hybrid mode", which simultaneously transmits a standard analog signal as well as a digital one,

16611-412: The other CBC operations. The CBC has frequently dealt with budget cuts and labour disputes, often resulting in a debate about whether the service has the resources necessary to properly fulfill its mandate. As of 2017 , all of CBC Television's terrestrial stations are owned and operated by the CBC directly. The number of privately owned CBC Television affiliates has gradually declined in recent years, as

16758-433: The overheating issues of needing to insert microphones directly in the transmission antenna circuit. Vacuum tube transmitters also provided high-quality AM signals, and could operate on higher transmitting frequencies than alternator and arc transmitters. Non-governmental radio transmissions were prohibited in many countries during World War I, but AM radiotelephony technology advanced greatly due to wartime research, and after

16905-471: The population of the Amazon region, and Agência Brasil , a news agency. Starting in 2021, EBC expanded the coverage of its radio stations through the new FM extended band to the metropolitan areas of São Paulo, Belo Horizonte and Recife, important Brazilian regions which did not have EBC radio stations. FPA is a non-profit foundation created by the government of the state of São Paulo in 1967 and includes

17052-410: The primarily entertainment-based CBC/Radio-Canada operations, but more closely formatted to (and carrying many of the same programs as) the U.S.-based Public Broadcasting Service (PBS), which itself is available terrestrially and – under a CRTC rule that requires Canadian cable, satellite and IPTV providers to carry affiliates of the four major U.S. commercial networks ( ABC , NBC , CBS and Fox ) and

17199-441: The primary early developer of AM technology is Canadian-born inventor Reginald Fessenden . The original spark-gap radio transmitters were impractical for transmitting audio, since they produced discontinuous pulses known as " damped waves ". Fessenden realized that what was needed was a new type of radio transmitter that produced steady "undamped" (better known as " continuous wave ") signals, which could then be "modulated" to reflect

17346-523: The public broadcaster. Some states often had problems with their public broadcasting services. In São Paulo, FPA had sometimes dealt with budget cuts, labor disputes and strikes. In Rio Grande do Sul, TVE-RS and FM Cultura were managed by the Piratini Foundation, a non-profit state foundation. However, due to the public debt crisis in the state, in 2018, the Piratini Foundation had its activities closed, and TVE-RS and FM Cultura started to be managed by

17493-637: The reception of AM transmissions and hurt the listening experience, among other reasons. However the United States Congress has introduced a bill to require all vehicles sold in the US to have an AM receiver to receive emergency broadcasts. The FM broadcast band was established in 1941 in the United States, and at the time some suggested that the AM band would soon be eliminated. In 1948 wide-band FM's inventor, Edwin H. Armstrong , predicted that "The broadcasters will set up FM stations which will parallel, carry

17640-586: The region now forming Bangladesh started in Dhaka on December 16, 1939. The Ministry of Information and Broadcasting (Bangladesh) is responsible for the administration of all government TV channels and Radio. Radio Television Brunei (RTB) is the only public broadcaster in Brunei Darussalam. In Hong Kong, the Radio Television Hong Kong ( RTHK ) is the sole public service broadcaster. Although being

17787-799: The same deficiencies. The lack of any means to amplify electrical currents meant that, like the alternator transmitters, modulation was usually accomplished by a microphone inserted directly in the antenna wire, which again resulted in overheating issues, even with the use of water-cooled microphones. Thus, transmitter powers tended to be limited. The arc was also somewhat unstable, which reduced audio quality. Experimenters who used arc transmitters for their radiotelephone research included Ernst Ruhmer , Quirino Majorana , Charles "Doc" Herrold , and Lee de Forest . Advances in vacuum tube technology (called "valves" in British usage), especially after around 1915, revolutionized radio technology. Vacuum tube devices could be used to amplify electrical currents, which overcame

17934-550: The same degree as commercial broadcasters, or at all; this allows public broadcasters to transmit programmes that are not commercially viable to the mass market , such as public affairs shows, radio and television documentaries , and educational programmes . One of the principles of public broadcasting is to provide coverage of interests for which there are missing or small markets. Public broadcasting attempts to supply topics of social benefit that are otherwise not provided by commercial broadcasters. Typically, such underprovision

18081-400: The same program, as over their AM stations... eventually the day will come, of course, when we will no longer have to build receivers capable of receiving both types of transmission, and then the AM transmitters will disappear." However, FM stations actually struggled for many decades, and it was not until 1978 that FM listenership surpassed that of AM stations. Since then the AM band's share of

18228-464: The schools' cooperative extension services . Stations in this era were internally funded, and did not rely on listener contributions to operate, some accepted advertising. Networks such as Iowa Public Radio , South Dakota Public Radio , and Wisconsin Public Radio began under this structure. The concept of a " non-commercial, educational " station per se did not show up in U.S. law until 1941, when

18375-489: The shares of four former programadoras ) and eight public radio stations (three stations are regional broadcasters). Chilean television was founded through universities, in an attempt to bring public television without the state having to pay directly and control content. The University of Chile (owner of the former channels 9 and 11 until 1993), the Catholic University of Chile on channels 2 and 13 until 2010, and

18522-486: The shows are produced by production studio JIB TV , which is 60% owned by NHK with the remaining 40% owned by private investors like Microsoft and Japanese bank Mizuho . The NHK World-Japan digital on-screen graphic is not used at all when shows produced by JIB TV air as paid programming. TV programs by NHK World-Japan include: Most recently, NHK World-Japan has promoting selections of their J-drama lineups under NHK Drama Showcase . NHK World Premium broadcasts

18669-410: The sounds being transmitted. Fessenden's basic approach was disclosed in U.S. Patent 706,737, which he applied for on May 29, 1901, and was issued the next year. It called for the use of a high-speed alternator (referred to as "an alternating-current dynamo") that generated "pure sine waves" and produced "a continuous train of radiant waves of substantially uniform strength", or, in modern terminology,

18816-672: The state of Pará , the state-funded foundation FUNTELPA ( Fundação Paraense de Radiodifusão ) operates the public educational state-wide television network Rede Cultura do Pará (which covers the entire state of Pará, reaching many cities of Brazilian Amazon ) and Rádio Cultura, a public radio station which broadcasts in FM for Belém . The state of Espírito Santo has the RTV-ES ( Rádio e Televisão Espírito Santo ), with its television channel TVE-ES ( TV Educativa do Espírito Santo ) and an AM radio station ( Rádio Espírito Santo ), and in Rio Grande do Sul ,

18963-651: The state-wide public television channel TVE-RS ( TV Educativa do Rio Grande do Sul ) and the public radio station FM Cultura (which broadcasts for Porto Alegre metropolitan area) are the two public broadcasters in the state. Regional public television channels in Brazil often broadcast part of TV Brasil or TV Cultura programming among with some hours of local programming. Since the government of Michel Temer , EBC has received several criticism from some politicians for having an alleged political bias. The president of Brazil from 2019 to 2022, Jair Bolsonaro , said in his campaign for

19110-487: The station directly with donations). It is the world's oldest listener-supported radio network. Since the creation of the Corporation for Public Broadcasting, Pacifica has sometimes received CPB support. Pacifica runs other stations in Los Angeles , New York City , Washington, D.C. , and Houston , as well as repeater stations and a large network of affiliates. A national public radio network, National Public Radio (NPR),

19257-411: The technology for AM broadcasting in stereo was challenging due to the need to limit the transmissions to a 20 kHz bandwidth, while also making the transmissions backward compatible with existing non-stereo receivers. In 1990, the FCC authorized an AM stereo standard developed by Magnavox, but two years later revised its decision to instead approve four competing implementations, saying it would "let

19404-575: The television channel TV Brasil (launched in 2007, being the merger of TVE Brasil, launched in Rio de Janeiro in 1975, and TV Nacional, launched in Brasilia in 1960), the radio stations Rádio Nacional and Rádio MEC , broadcast to Brasilia , Rio de Janeiro , São Paulo , Belo Horizonte , Recife , and Tabatinga , Rádio Nacional da Amazônia , a shortwave radio station based in Brasília with programming aimed to

19551-428: The three major French-language television networks in Canada, Ici Radio-Canada Télé is the only one that maintains terrestrial owned-and-operated stations and affiliates in all ten Canadian provinces , although it maintains only one station ( Moncton, New Brunswick -based CBAFT-DT ) that serves the four provinces comprising Atlantic Canada . In recent years, the CBC has also expanded into new media ventures including

19698-401: The translator stations are not permitted to originate programming when the "primary" AM station is broadcasting, they are permitted to do so during nighttime hours for AM stations licensed for daytime-only operation. Prior to the adoption of the new policy, as of March 18, 2009, the FCC had issued 215 Special Temporary Authority grants for FM translators relaying AM stations. After creation of

19845-492: The upper end of the Region 2 AM broadcast band, by adding ten frequencies which spanned from 1610 kHz to 1700 kHz. At this time it was suggested that as many as 500 U.S. stations could be assigned to the new frequencies. On April 12, 1990, the FCC voted to begin the process of populating the expanded band, with the main priority being the reduction of interference on the existing AM band, by transferring selected stations to

19992-548: The war the availability of tubes sparked a great increase in the number of amateur radio stations experimenting with AM transmission of news or music. Vacuum tubes remained the central technology of radio for 40 years, until transistors began to dominate in the late 1950s, and are still used in the highest power broadcast transmitters. Unlike telegraph and telephone systems, which used completely different types of equipment, most radio receivers were equally suitable for both radiotelegraph and radiotelephone reception. In 1903 and 1904

20139-742: The world's first high-definition television technology in 1964 and launching high definition services in Japan in 1981. The public broadcaster in Malaysia is the state-owned Radio Televisyen Malaysia (RTM) and TV Alhijrah . RTM was previously funded publicly through money obtained from television licensing , however it is currently state-subsidised, as television licences have been abolished. As of 2021 RTM operates 6 national, 16 state and 11 district radio stations as well as 6 national terrestrial television channels: TV1 , TV2 , TV Okey , Sukan RTM , Berita RTM , and TV6. AM broadcasting AM broadcasting

20286-611: The world, as well as online and through its mobile apps. NHK World-Japan is also available on DirecTV channels 322 and 2049. It is headquartered in Tokyo . NHK World-Japan currently provides three main broadcast services: an English-language current affairs TV channel ( NHK World TV ), a multilingual radio service ( NHK World Radio Japan ), and a Japanese-language general/entertainment TV service ( NHK World Premium ). NHK World-Japan also makes most of its programming available through its website (either live or on demand ). A Chinese version of

20433-404: The youngest demographic groups. Among persons aged 12–24, AM accounts for only 4% of listening, while FM accounts for 96%. Among persons aged 25–34, AM accounts for only 9% of listening, while FM accounts for 91%. The median age of listeners to the AM band is 57 years old, a full generation older than the median age of FM listeners." In 2009, the FCC made a major regulatory change, when it adopted

20580-474: Was approved by the FCC for use by AM stations, initially only during daytime hours, due to concerns that during the night its wider bandwidth would cause unacceptable interference to stations on adjacent frequencies. In 2007 nighttime operation was also authorized. The number of hybrid mode AM stations is not exactly known, because the FCC does not keep track of the stations employing the system, and some authorized stations have later turned it off. But as of 2020

20727-593: Was created in February 1970, following the passage of the Public Broadcasting Act of 1967. This network replaced the Ford Foundation–backed National Educational Radio Network . Some independent local public radio stations buy their programming from distributors such as NPR; Public Radio International (PRI); American Public Media (APM); Public Radio Exchange (PRX); and Pacifica Radio , most often distributed through

20874-400: Was immediately recognized that, much like the telegraph had preceded the invention of the telephone, the ability to make audio radio transmissions would be a significant technical advance. Despite this knowledge, it still took two decades to perfect the technology needed to make quality audio transmissions. In addition, the telephone had rarely been used for distributing entertainment, outside of

21021-400: Was not enacted until 15 September 1997. Though a public broadcaster, it airs commercial advertisements. In Indonesia, there are three types of public broadcaster. The first two are national-scale broadcasters: Radio Republik Indonesia (RRI) and Televisi Republik Indonesia (TVRI). RRI currently operates four radio networks carried by some or all of more than 90 local stations, one of them is

21168-703: Was not established until the 1920s, following the development of vacuum tube receivers and transmitters. AM radio remained the dominant method of broadcasting for the next 30 years, a period called the " Golden Age of Radio ", until television broadcasting became widespread in the 1950s and received much of the programming previously carried by radio. Later, AM radio's audiences declined greatly due to competition from FM ( frequency modulation ) radio, Digital Audio Broadcasting (DAB), satellite radio , HD (digital) radio , Internet radio , music streaming services , and podcasting . Compared to FM or digital transmissions , AM transmissions are more expensive to transmit due to

21315-517: Was rented to a private operator on 1 October 1993 and is now known today as " Chilevisión ". Televisión Nacional, popularly known as Channel 7 due to its Santiago frequency, is governed by a seven-member board appointed by both the President and the Senate . It is meant to be independent of political pressures, although accusations of bias have been made, especially during election campaigns. Ecuador TV

21462-468: Was the first organization to create a radio network, and also to promote commercial advertising, which it called "toll" broadcasting. Its flagship station, WEAF (now WFAN) in New York City, sold blocks of airtime to commercial sponsors that developed entertainment shows containing commercial messages . AT&T held a monopoly on quality telephone lines, and by 1924 had linked 12 stations in Eastern cities into

21609-406: Was the lack of amplifying the signals, so listeners had to use earphones , and it required the development of vacuum-tube receivers before loudspeakers could be used. The dynamic cone loudspeaker , invented in 1924, greatly improved audio frequency response over the previous horn speakers, allowing music to be reproduced with good fidelity. AM radio offered the highest sound quality available in

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