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FM Radio
FM broadcasting is a method of radio broadcasting using frequency modulation (FM) technology. Invented in 1933 by American engineer Edwin Armstrong, it is used worldwide to provide high-fidelity sound over broadcast radio. FM broadcasting is capable of better sound quality than AM broadcasting, the chief competing radio broadcasting technology, so it is used for most music broadcasts. FM radio stations use the VHF frequencies
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Amplitude Modulation
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. In amplitude modulation, the amplitude (signal strength) of the carrier wave is varied in proportion to that of the message signal being transmitted. The message signal is, for example, a function of the sound to be reproduced by a loudspeaker, or the light intensity of pixels of a television screen. This technique contrasts with frequency modulation, in which the frequency of the carrier signal is varied, and phase modulation, in which its phase is varied. AM was the earliest modulation method used to transmit voice by radio
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Japan
Japan (Japanese: 日本, Nippon [ɲippoꜜɴ] (About this soundlisten) or Nihon [ɲihoꜜɴ] (About this soundlisten)) is an island country located in East Asia. It is bordered by the Sea of Japan to the west and the Pacific Ocean to the east, and spans more than 3,000 kilometers (1,900 mi) along the coast of the continent from the Sea of Okhotsk in the north to the East China Sea and Philippine Sea in the south. Part of the Pacific Ring of Fire, Japan encompasses a stratovolcanic archipelago of about 6,852 islands, with five main islands (Hokkaido, Honshu, Kyushu, Shikoku, and Okinawa) comprising 97% of the country's total area of 377,975 square kilometers (145,937 sq mi). Japan is officially divided into 47 prefectures and traditionally into eight regions. Approximately two-thirds of the country's terrain is mountainous and heavily forested, and less than one-eighth of land is suitable for agriculture
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South Korea
South Korea, officially the Republic of Korea (abbreviated ROK), is a sovereign state in East Asia constituting the southern part of the Korean Peninsula. South Koreans lead a distinctive urban lifestyle, with half of them living in high-rises concentrated in the Seoul Capital Area with 25 million residents. The earliest neolithic Korean pottery dates to 8000 BC, with three kingdoms flourishing in the 1st century BC
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Caribbean
The Caribbean (/ˌkærɪˈbən/ or /kəˈrɪbiən/, local most common pronunciation /ˈkærɪˌbən/) is a region that consists of the Caribbean Sea, its islands (some surrounded by the Caribbean Sea and some bordering both the Caribbean Sea and the North Atlantic Ocean) and the surrounding coasts. The region is southeast of the Gulf of Mexico and the North American mainland, east of Central America, and north of South America. Situated largely on the Caribbean Plate, the region comprises more than 700 islands, islets, reefs and cays
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Europe
Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, Asia to the east, and the Mediterranean Sea to the south. It comprises the westernmost part of Eurasia. It is the 6th largest continent in the world. Europe is commonly considered to be separated from Asia by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas and the waterways of the Turkish Straits. Although the term "continent" implies physical geography, the land border is somewhat arbitrary and has been redefined several times since its first conception in classical antiquity. The division of Eurasia into two continents reflects East-West cultural, linguistic and ethnic differences which vary on a spectrum rather than with a sharp dividing line
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Greenland
Greenland (Greenlandic: Kalaallit Nunaat, pronounced [kalaːɬit nunaːt]; Danish: Grønland, pronounced [ˈɡʁɶnˌlanˀ]) is an autonomous constituent country within the Kingdom of Denmark between the Arctic and Atlantic Oceans, east of the Canadian Arctic Archipelago. Though physiographically a part of the continent of North America, Greenland has been politically and culturally associated with Europe (specifically Norway and Denmark, the colonial powers, as well as the nearby island of Iceland) for more than a millennium. The majority of its residents are Inuit, whose ancestors began migrating from the Canadian mainland in the 13th century, gradually settling across the island. Greenland is the world's largest island
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Africa
Africa is the world's second largest and second most-populous continent (the first being Asia in both categories). At about 30.3 million km2---> (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area and 20% of its total land area. With 1.2 billion people as of 2016, it accounts for about 16% of the world's human population. The continent is surrounded by the Mediterranean Sea to the north, both the Suez Canal and the Red Sea along the Sinai Peninsula to the northeast, the Indian Ocean to the southeast and the Atlantic Ocean to the west. The continent includes Madagascar and various archipelagos
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Italy
Italy (Italian: Italia [iˈtaːlja] (About this soundlisten)), officially the Italian Republic (Italian: Repubblica Italiana [reˈpubblika itaˈljaːna]), is a European country consisting of a peninsula delimited by the Alps and surrounded by several islands. Italy is located in south-central Europe, and it is also considered a part of western Europe. The country covers a total area of 301,340 km2---> (116,350 sq mi) and shares land borders with France, Switzerland, Austria, Slovenia, and the enclaved microstates of Vatican City and San Marino. Italy has a territorial exclave in Switzerland (Campione) and a maritime exclave in the Tunisian Sea (Lampedusa)
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Amplitude Modulation
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. In amplitude modulation, the amplitude (signal strength) of the carrier wave is varied in proportion to that of the message signal being transmitted. The message signal is, for example, a function of the sound to be reproduced by a loudspeaker, or the light intensity of pixels of a television screen. This technique contrasts with frequency modulation, in which the frequency of the carrier signal is varied, and phase modulation, in which its phase is varied. AM was the earliest modulation method used to transmit voice by radio
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OIRT
The International Radio and Television Organisation (official name in French: Organisation Internationale de Radiodiffusion et de Télévision or OIRT (before 1960 International Broadcasting Organization (IBO), official name in French: Organisation Internationale de Radiodiffusion (OIR)) was an East European network of radio and television broadcasters with the primary purpose of establishing ties and securing an interchange of information between those various organizations responsible for broadcasting services, promoting the interests of broadcasting, seeking by international cooperation a s
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UHF
Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one decimeter. Radio waves with frequencies above the UHF band fall into the SHF (super-high frequency) or microwave frequency range. Lower frequency signals fall into the VHF (very high frequency) or lower bands. UHF radio waves propagate mainly by line of sight; they are blocked by hills and large buildings although the transmission through building walls is strong enough for indoor reception
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Land Mobile Radio System
Land mobile radio system (LMRS), also called public land mobile radio or private land mobile radio, is a wireless communications system intended for use by terrestrial users in vehicles (mobiles) or on foot (portables). Examples are two way radios in vehicles. Such systems are used by emergency first responder organizations such as police, fire, and ambulance services, public works organizations, dispatched services such as taxis, or companies with large vehicle fleets or numerous field staff
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Noise
Noise is unwanted sound judged to be unpleasant, loud or disruptive to hearing. From a physics standpoint, noise is indistinguishable from sound, as both are vibrations through a medium, such as air or water. The difference arises when the brain receives and perceives a sound. In experimental sciences, noise can refer to any random fluctuations of data that hinders perception of an expected signal. Acoustic noise is any sound in the acoustic domain, either deliberate (e.g., music or speech) or unintended. In contrast, noise in electronics may not be audible to the human ear and may require instruments for detection. In audio engineering, noise can refer to the unwanted residual electronic noise signal that gives rise to acoustic noise heard as a hiss
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