Denis d'or

•  Digital synthesizer

  A digital synthesizer is a synthesizer that uses digital signal processing (DSP) techniques to make musical sounds. Electronic keyboards make music through sound waves. The very earliest digital synthesis experiments were made with general-purpose computers, as part of academic research into sound generation.

  

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•  Electronic musical instrument

  An electronic musical instrument is a musical instrument that produces its sounds using electronics. Such an instrument sounds by outputting an electrical audio signal that ultimately drives a loudspeaker. An electronic instrument may include a user interface for controlling its sound, often by adjusting the pitch, frequency, or duration of each note.

  

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•  Roland Octapad

  Roland Octapad was a range of MIDI percussion controllers produced by the Roland Corporation.

  

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•  Theremin

  The theremin, originally known as the aetherphone / etherophone or termenvox / thereminvox is an early electronic musical instrument controlled without contact from the player. It is named after its Russian inventor, Professor Léon Theremin, who patented the device in 1928. The controlling section usually consists of two metal antennas which sense the position of the player's hands and control oscillators for frequency with one hand, and amplitude with the other.

  

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•  Vocoder

  A vocoder (a combination of the words voice and encoder) is an analysis / synthesis system, mostly used for speech. In the encoder, the input is passed through a multiband filter, each band is passed through an envelope follower, and the control signals from the envelope followers are communicated to the decoder. The decoder applies these (amplitude) control signals to corresponding filters in the (re)synthesizer.

  

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•  Zeta Instrument Processor Interface

  Zeta Instrument Processor Interface (ZIPI) was a research project initiated by Zeta Instruments and UC Berkeley's CNMAT (Center for New Music and Audio Technologies). Introduced in 1994 in a series of publications in Computer Music Journal from MIT Press, ZIPI was intended as the next-generation transport protocol for digital musical instruments, designed with compliance to OSI model.

  

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•  Mellotron

  The Mellotron is an electro-mechanical, polyphonic keyboard originally developed and built in Birmingham, England in the early 1960s. It superseded the Chamberlin, which was the world's first sample-playback keyboard. The heart of the instrument is a bank of parallel linear magnetic audio tapes, which have approximately eight seconds of playing time each. Playback heads underneath each key enable the playing of pre-recorded sounds.

  

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•  Electrophone

  The fifth group, electrophone category was added to the Hornbostel-Sachs musical instrument classfication system by Sachs in 1940, to describe instruments involving electricity. Sachs broke down his 5th category into 3 subcategories: 51=electrically actuated acoustic instruments; 52=electrically amplified acoustic instruments; 53= instruments in which make sound primarily by way of electrically driven oscillators, such as theremins or synthesizers, which he called radioelectric instruments.

  

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•  Analog synthesizer

  An analog or analogue synthesizer (or analog synth) is a synthesizer that uses analog circuits and analog computer techniques to generate sound electronically. The earliest analog synthesizers in the 1920s and 1930s such as the Trautonium were built with a variety of vacuum-tube (thermionic valve) and electro-mechanical technologies.

  

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•  Electro-Theremin

  The Electro-Theremin, often called the Tannerin, is an electronic musical instrument developed by trombonist Paul Tanner and amateur inventor Bob Whitsell in the late 1950s to produce a sound to mimic that of the theremin. The instrument features a tone and portamento similar to that of the theremin (or thereminvox), but with a different control mechanism. It consisted of a sine wave generator with a knob that controlled the pitch, placed inside a wooden box.

  

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•  Pat Toomey

  Patrick Joseph "Pat" Toomey, Sr. (born November 17, 1961) is an American politician. He was a member of the U.S. House of Representatives from Pennsylvania, a Republican representing the Lehigh Valley-based 15th congressional district from January 1999 to January 2005, when he retired after running for a seat in the United States Senate.

  

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•  Georgios Kedrenos

  Georgios Kedrenos, also known as George Cedrenus, was a Byzantine historian. In the 1050s he compiled A concise history of the world, which spanned the time from the biblical account of creation to his own day. Kedrenos is one of the few sources that discuss Khazar polities in existence after the sack of Atil in 969.

  

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•  Tagabo Hills

  The Tagabo Hills is a volcanic field in the region of Darfur in Sudan. It lies north of the Marrah Mountains and southwest of the larger Meidob Volcanic Field. The Tagabo Hills are also known as the Kutum Volcanic Field, after the town of Kutum, or the Berti Hills after the Berti people. It contains well-preserved features, such as scoria cones, thought to be of the late Pleistocene or even as recent as the Holocene. However, a 1997 analysis ascribed the rocks only to the Tertiary age.

  

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•  List of Presidents of the University of Maryland, College Park

  The President of the University of Maryland, College Park manages the day to day operations of the University of Maryland, College Park. The President is expected to work cooperatively with the University Senate and the University System of Maryland Board of Regents to effectively manage the university.

  

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