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Monosynth : ウィキペディア英語版
Polyphony and monophony in instruments

Polyphony is a property of musical instruments, meaning they can play multiple notes simultaneously. Instruments featuring polyphony are said to be polyphonic. Instruments that are not capable of polyphony are monophonic or paraphonic.
==Synthesizer==

===Monophonic===
A monophonic synthesizer or ''monosynth'' is a synthesizer that produces only one note at a time, making it smaller and cheaper than a polyphonic synthesizer which can play multiple notes at once. This does not neccessarily refer to a synthesizer with a single oscillator; The Minimoog, for example, has three oscillators which are settable in arbitrary intervals, but it can play only one note at a time.
Well-known monosynths include the Minimoog, the Roland TB-303, and the Korg Prophecy.
===Duophonic===
Duophonic synthesizers, such as the ARP Odyssey and Formanta Polivoks built in the 1970s and 1980s respectively, have a capability to independently play two pitches at a time. These synthesizers have at least two oscillators that are separately controllable, and a duophonic keyboard that can generate two control voltage signals for the lowest- and highest-note. When two or more keys are pressed simultaneously, the lowest- and highest-note will be heard. When only one key is pressed, both oscillators are assigned to one note, possibly with a more complex sound.
===Polyphonic===
The earliest polyphonic synthesizers were built in the late-1930s, but the concept did not become popular until the mid-1970s. Harald Bode's “Warbo Formant Orguel”, developed in 1937, was an archetype of a voice allocation polyphonic synthesizer.〔
(also broken format page is remained (here ))〕 Novachord by Hammond Organ Company, released in 1939, is a forefather product of frequency divider organs and polyphonic synthesizer. It uses octave divider technology to generate polyphony,〔
(【引用サイトリンク】url = http://www.novachord.com/schematics.html )〕 and about 1,000 Novachords were manufactured until 1942.〔(【引用サイトリンク】url = http://www.novachord.com/intro.html )

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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