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The Yamaha DX7 is an FM (frequency modulation) based digital synthesizer manufactured by the Yamaha Corporation from 1983 to 1989. It was the first commercially successful digital synthesizer.〔 〕〔 〕〔 (Note: the above sales number seems about whole DX series) 〕 Its distinctive sound can be heard on many recordings, especially pop music from the 1980s. The monotimbral, 16-note polyphonic DX7 was the moderately priced model of the DX series of PM (FM) keyboard synthesisers that included the larger and more elaborate DX1 and DX5; the feature-reduced DX9; and the smaller and not directly compatible DX100, DX11, and DX21. Over 200,000 of the original DX7 were made,〔〔 〕〔http://www.sonicstate.com/news/2015/01/26/namm-2015-video-yamaha-vintage-synth-museum-tour/〕 and it remains one of the best-selling synthesizers of all time.〔〔 〕〔 Other best-selling synthesizers included: *Korg M1 (1988–1995) — over 100,000 units until 1990, reported 250,000 until 1995 * * *KORG microKORG (2002–current) — over 100,000 units until 2009, and still in production as of 2014. * * *Casio CZ series (1984–c.1987) — estimated 80,000 CZs sold worldwide. * * 〕 Tone generation in the DX7 is based on linear phase modulation synthesis, officially euphemised as frequency modulation (FM), which was developed based upon research by/licensed from John Chowning at Stanford University.〔 〕 This uses multiple sine wave oscillators, which can modulate each other in various configurations offered as 32 "algorithms", thus generating a wide variety of possible harmonic and inharmonic spectra. The DX7 was known for the precision and flexibility of its bright, digital sounds, which could be clearer and less linear than those of the subtractive analog synthesizers that preceded it. The DX7 is well known for its electric piano, bells, and other "struck" and "plucked" sounds which emphasize complex attack transients. Phase modulation as used in this and later synthesisers is capable of generating a wide range of both imitative and purely synthetic sounds. ==Programming== Voices can be programmed by a user, and stored into a 32-voice RAM internal memory, or corresponding 32-voice DX7 RAM cartridge inserted into a port on the front of the unit. Pre-programmed ROM cartridges could also be inserted here and the original DX7 shipped with two of these cartridges with two banks of 32 voices (sounds) each, for a total of 128 voices available. Several computer applications exist for various operating systems (Atari, Mac OS, and Windows) that can enable a user to load different presets into the keyboard from a computer via MIDI; most computer based MIDI recording software can also load to or save from the DX7. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Yamaha DX7」の詳細全文を読む スポンサード リンク
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