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The ondes Martenot (/ ˈ oʊ n d m ɑːr t ə ˈ n oʊ / OHND mar-tə-NOH; French: [ɔ̃d maʁtəno], "Martenot waves") or ondes musicales ("musical waves") is an early electronic musical instrument. It is played with a keyboard or by moving a ring along a wire, creating "wavering" sounds similar to a theremin .
The instrument penetrates haze and mist in daylight or darkness and has a normal range of 30–50 km but can extend up to 70 km. [5] The MRB2 or Hydrodist was a marine version that was used in coastal hydrographic surveys and calibrating ships using other survey navigation systems.
Millimetre wave communication was first investigated by Bengali physicist Jagadish Chandra Bose during 1894–1896, when he reached an extremely high frequency of up to 60 GHz in his experiments. [25] He also introduced the use of semiconductor junctions to detect radio waves, [26] when he patented the radio crystal detector in 1901. [27] [28]
First public television broadcasts in the UK by John Logie Baird between London and Glasgow and in the US by Frederic Eugene Ives (1882–1953) between Washington and New York. The American inventor Philo Taylor Farnsworth (1906–1971) developed in Los Angeles, the first fully electronic television system in the world.
It is the earliest known electric-powered musical instrument, antedated only by the Denis d'or, which is only known from written accounts. The world's first electronic instrument was created in 1753 by the Czech musician and clergyman Prokop Divish (1698 - 1765). His distinctive feature was to show experiments in physics lessons.
1963 : Keio Electronics (later Korg) produces the DA-20, an earliest electronic drum machine in Japan; 1964 : Ikutaro Kakehashi debuts Ace Tone R-1 Rhythm Ace, their first electronic drum [12] [13] [14] 1965 : Nippon Columbia patents their early electronic drum machine [15] 1966 : Korg releases Donca-Matic DE-20, an early electronic drum ...
The Great Rift Valley of Africa provides critical evidence for the evolution of early hominins.The earliest tools in the world can be found there as well: An unidentified hominin, possibly Australopithecus afarensis or Kenyanthropus platyops, created stone tools dating to 3.3 million years ago at Lomekwi in the Turkana Basin, eastern Africa.
Developments in early recording technology paralleled that of electronic instruments. The first means of recording and reproducing audio was invented in the late 19th century with the mechanical phonograph. [24] Record players became a common household item, and by the 1920s composers were using them to play short recordings in performances. [25]