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Low-frequency oscillation
Low-frequency oscillation (LFO) is an electronic signal which is usually below 20 Hz and creates a rhythmic pulse or sweep. This pulse or sweep is often used to modulate synthesizers, delay lines and other audio equipment in order to create effects used in the production of electronic music. Audio effects such as vibrato, tremolo and phasing are examples. The abbreviation is also very often used to refer to low-frequency oscillators themselves.
==History==
Low-frequency oscillation as a concept was first introduced in the modular synths of the 1960s and 70s. Often the LFO effect was accidental, so there were myriad configurations that could be 'patched' by the synth operator. LFOs have since appeared in some form on almost every synthesizer. More recently other electronic musical instruments, such as samplers and software synthesizers, have included LFOs to increase their sound alteration capabilities.
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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