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CV/Gate (an abbreviation of ''Control Voltage/Gate'') is an analog method of controlling synthesizers, drum machines and other similar equipment with external sequencers. The Control Voltage typically controls pitch and the Gate signal controls note on/off. This method was widely used in the epoch of analog modular synthesizers, beginning in the 1960s and up to the early 1980s.〔(The GROOVE system ) (Max Mathews, 1970)〕〔(GROOVE & VAmpire - (1970) )〕 It was mostly superseded by the MIDI protocol, which is more feature-rich, easier to configure reliably, and more easily supports polyphony.〔Dominic Milano, ''Mind over MIDI'', Hal Leonard Corporation, 1988, p.1.〕 The advent of digital synthesizers also made it possible to store and retrieve voice 'patches' - eliminating patch cables〔The Minimoog, released in 1971, had no patch cables; making a more portable instrument by restricting options - but with no ''storage''.〕 and (for the most part) control voltages.〔Brent Hurtig, ''Synthesizer basics''. Hal Leonard Corporation, 1988, p.11.〕 However, numerous companies – including Doepfer, who designed a modular system for Kraftwerk in 1992〔Doepfer〕 Buchla, MOTM, Analogue Systems, and others continue to manufacture modular synthesizers that are increasingly popular and rely primarily on analog CV/Gate signals for communication. Additionally, some recent non-modular synthesizers (such as the Alesis Andromeda) and many effects devices (including the Moogerfooger pedals by Moog as well as many guitar oriented devices) include CV/Gate connectivity. Many modern studios use a hybrid of MIDI and CV/Gate to allow synchronization of older and newer equipment. == Basic usage == In early modular synthesizers, each synthesizer component (e.g., LFO, VCF, etc.) can be connected to another component by means of a patch cable that transmits voltage. Changes in that voltage cause changes to one or more parameters of the component. This frequently involved a keyboard transmitting two types of data (CV and Gate), or control modules such as LFOs and envelope generators transmitting CV data: * CV (''Control Voltage'') indicates which note (event) to play: a different voltage for each key pressed; those voltages are typically connected to one or more oscillators, thus producing the different pitches required. Note that such a method implies that the synthesizer is monophonic. CV can also control parameters such as rate, depth or duration of a control modules. * Gate (sometimes called ''Trigger'') indicates when a note should start, a pulse that is used to trigger an event, typically an ADSR envelope. In the case of triggering a drum machine, a clock signal or LFO square wave could be employed to signal the next beat (or rest). 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「CV/Gate」の詳細全文を読む スポンサード リンク
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